Wellcircuits supports Kickstarter creators through sponsorship – Activities – Wellcircuits

모모This is Sean Hodgins몶 crowdfunding project, 몷PIXO Pixel C An ESP32-Based IoT RGB Display for Make/100!몷, launched on Kickstarter. The project has been so successful that it has already garnered support from 158 backers. We are honored to have been chosen to help bring this project to life.So we can draw a preliminary conclusion, PCB manufacturing in China It is helpful to the needs of the industry market and social development. https://www.wellcircuits.com/

모모

모모Kickstarter is a crowdfunding platform dedicated to creativity, with a mission to 몷help bring creative projects to life.몸 Many creators have launched successful projects on Kickstarter, and we are excited to support them in this journey.

모모

모모To further support creators, Wellcircuits is offering the following exclusive benefits:

모모

모모10% discount on assembly services (up to $300) for any successful Kickstarter crowdfunding project. You can also request a coupon code for your backers!

모모

모모To claim this offer, simply send your project link to anson@wellcircuits.com, and you will be eligible for the discount.

모모

모모Wellcircuits is a professional PCB manufacturing and assembly company with a strong reputation among engineers worldwide. We ensure that all aspects of your crowdfunding project run smoothly. All our components are 100% original, and we guarantee timely delivery so that creators can send products to their supporters as quickly as possible. In addition, we offer exceptional after-sales support to ensure complete satisfaction.

모모

모모Let몶s bring creative projects to life!

Wellcircuits supports Kickstarter creators through sponsorship – Activities – Wellcircuits

모모This is Sean Hodgins몶 crowdfunding project, 몷PIXO Pixel C An ESP32-Based IoT RGB Display for Make/100!몷, launched on Kickstarter. The project has been so successful that it has already garnered support from 158 backers. We are honored to have been chosen to help bring this project to life.consequently RF PCB I also got a lot of attention and wanted to join the ranks. https://www.wellcircuits.com/

모모

모모Kickstarter is a crowdfunding platform dedicated to creativity, with a mission to 몷help bring creative projects to life.몸 Many creators have launched successful projects on Kickstarter, and we are excited to support them in this journey.

모모

모모To further support creators, Wellcircuits is offering the following exclusive benefits:

모모

모모10% discount on assembly services (up to $300) for any successful Kickstarter crowdfunding project. You can also request a coupon code for your backers!

모모

모모To claim this offer, simply send your project link to anson@wellcircuits.com, and you will be eligible for the discount.

모모

모모Wellcircuits is a professional PCB manufacturing and assembly company with a strong reputation among engineers worldwide. We ensure that all aspects of your crowdfunding project run smoothly. All our components are 100% original, and we guarantee timely delivery so that creators can send products to their supporters as quickly as possible. In addition, we offer exceptional after-sales support to ensure complete satisfaction.

모모

모모Let몶s bring creative projects to life!

Where is the most correct place for air conditioning Many people don’t know the secre

  Whether in cold winter or hot summer, air conditioning is an essential household appliance in our home, especially now that people’s living standards have improved, air conditioning has entered thousands of households. Many owners think that choosing air conditioning is the most important thing. I don’t know if it is familiar, but the placement of air conditioning is even more difficult. If it is not in the right position, it will bring trouble to our lives. Many people don’t know the secret of air conditioning placement. Come and have a look with Xiaobian.In addition to these aspects, industrial cooling systems The performance in other aspects is also relatively good, which has attracted everyone’s attention and research. https://puremind.com/product-category/puremind-air-conditioner/industrial-chiller/

  

  Where is the most correct place for air conditioning? Many people don’t know the secret of air conditioning ~!

  

  Where are the air conditioners placed?

  

  (1) How to place the air conditioner in the living room?

  

  1. Air-conditioning is a kind of fast-running electrical appliance, so it will transfer the air flow from the outside to the home, such as the main disease in the southwest. Therefore, if the air-conditioning at home is placed in this position, it will definitely make the family suffer from illness and illness this year. Correction method: use a small fan to change the wind direction opposite the air conditioner. In addition, if you want to strengthen the above fortune, you can also move the air conditioner to this position, which has a strong effect on luck and transshipment.

  

  2. The most taboo of the air conditioner outlet is to blow to the financial position, and take away the wealth at home together with the cold wind, and the door at home is the main wealth. Therefore, if the air conditioner directly faces the door, it will not only drain the wealth, but also symbolize the popularity. It means that the home is not warm. Correction method: hang a glass screen or cloth curtain at the entrance to solve it.

  

  3. The air outlet of the air conditioner directly blows the main chair in the living room (that is, the sofa where three people sit), so that the face sitting here is blown very uncomfortable, which means that the backer is unstable and affects the work and career fortune. Correction: Let the air outlet of the air conditioner come from the side, or move the position of the main sofa.

  

  Where is the most correct place for air conditioning? Many people don’t know the secret of air conditioning ~!

  

  (2) How to place the air conditioner in the bedroom?

  

  1. Air-conditioning often emits a certain amount of heat during refrigeration, so it must be installed far away from other electrical appliances and avoid being installed in corners, which can make the air-conditioning dissipate heat as soon as possible, ensure that it is not damaged, and prolong its service life.

  

  2. The air conditioner is installed at a certain distance from the bed. If it is facing the bed or too close to the bed, it will easily lead to the user catching a cold or catching a cold, which will adversely affect people’s health. Therefore, everyone needs to pay special attention to this when installing the air conditioner.

  

  Where is the most correct place for air conditioning? Many people don’t know the secret of air conditioning ~!

  

  3. Air conditioning is installed in the bedroom in the northeast direction, because the radiation in this direction will be relatively small, so that the harm to the human body can be reduced to. In real life, many owners will ignore this problem, which is actually a very serious misunderstanding.

  

  4. The height of the air conditioner installed in the bedroom is very elegant. It is not appropriate to be too high or too low. It is recommended that it be higher than one meter and lower than two meters. This height is the most suitable, and its use effect will be in a new state, and it is more convenient for daily use.

  

  Where is the most correct place for air conditioning? Many people don’t know the secret of air conditioning ~!

  

  What are the precautions for air conditioning placement?

  

  1, kitchen air conditioning moving stove fire

  

  It is the place where the whole family can fill their stomachs without installing a kitchen stove. If the air conditioner directly touches the stove fire, it will make the stove fire weak, which will damage the energy of the food in cooking, thus affecting the health of the occupants. In addition, the stove fire is also representative, so it has a great influence on the couple’s sexual life. Try not to install air conditioning in the kitchen, but if you must, try to blow the wind towards the ceiling or sideways.

  

  2, the dining room air conditioning dirty food

  

  Blowing the dining table directly is a big no-no, it will inevitably accumulate dust if the air conditioner blows the dining table directly, so it is very likely that the dust will fall into the hot food with the wind, and of course it is easier to cool the delicious meals on the table. Theoretically speaking, eating “dirty rice and cold dishes” for a long time will lead to the hidden worry of being defeated, so the air conditioner in the dining room should not be above or near the dining table.

  

  Where is the most correct place for air conditioning? Many people don’t know the secret of air conditioning ~!

  

  3, bedroom air conditioning to prevent discomfort

  

  When people who use the air conditioner evenly to eliminate evil spirits sleep, the pores are wide open and the respiratory system is relatively unguarded. Therefore, if the air conditioner blows directly on the human body, it will not only make the body uncomfortable and catch a cold, but also attract evil spirits more easily. Therefore, the air outlet will be raised upwards, or the windows in the room will be slightly opened to even the cold air coming straight.

  

  4. Air conditioning in the study transports energy

  

  Wenchang’s good luck comes to the air conditioner to make people cool, so it has the function of condensing thinking and improving reading concentration. If the air conditioner in the study can be moved to the north and the energy of air conditioning operation can be used, it will drive Wenchang’s good luck and be beneficial to candidates or people who study knowledge. Of course, remember not to blow the air outlet toward your face or head, lest your head be unbearable before you finish reading the book.

  

  Xiaobian will introduce the relevant information about the placement of air conditioners here for everyone. The placement of air conditioners directly affects our daily life and fortune. If you are also worried about the placement of air conditioners, you may wish to refer to the suggestions in the article and choose the optimal scheme, so as to feel the comfort brought by air conditioners to a certain extent without affecting human health. I hope that the knowledge summarized by Xiaobian can bring you help.

Air conditioning 26℃ is the most reliable Should I turn off the air conditioner when

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  If you leave home for a day …

  

  Kureczka said: “If you just leave home for one day, it is more energy-saving to turn on the air conditioner, but you should raise the temperature by several degrees instead of keeping the comfortable temperature set at home.”

  

  If the house is unoccupied for only a day or two, the same direction applies.

  

  It’s not necessarily a bad thing to turn off the air conditioner during the day. Either way, the speed of the air conditioner is the same-it just takes longer to cool the hot space. In fact, if you drive at normal temperature all day, you may consume more energy than if you turn it off and have a meeting at night.

  

  Air conditioning is not only to cool the space, but also to greatly reduce the humidity level. When the air conditioner is turned off for more than a few hours, the humidity level begins to rise, which may easily lead to mold growth, damage to electronic products, and warping and deformation of wood products. In addition, pets left at home may also be at risk of overheating and discomfort, which may occur especially in hot and humid climate.

  

  This is why it is suggested to turn on the air conditioner, but turn up the temperature. The U.S. Department of Energy pointed out that higher indoor temperature will actually slow down the flow of heat into the house, thus saving energy and money.

  

  When you get home, don’t turn the air conditioner down too low to “speed up” the cooling process, so that the room won’t get cold faster, and it will only increase energy consumption (cost money).

  

  02

  

  If you leave home for more than two days …

  

  If the whole family (including pets) has been away from home for more than two days, the equipment can be turned off. Kureczka said, “Turn off the air conditioner, and you can save a lot of energy and bills.”

  

  This means that when you come back, the temperature inside the room may not be very good and you will feel stuffy. Kureczka suggested, “Installing an intelligent thermostat is a good way to monitor and control the energy efficiency of your home, even if you are not at home-you can turn up the temperature before you leave and then turn it down on your way home.”

  

  She also suggested that if you go out for more than a few hours, please close the curtains, which can effectively block the sun, so that the air conditioning unit does not have to work so hard. Especially in areas with extreme temperatures, this will make a huge difference.

  

  03

  

  At home …

  

  The US Department of Energy and the Environmental Protection Agency suggest that the thermostat should be set to 26≧ or higher during the day, 28≧ when sleeping and 29≧ when going out.

  

  Think this setting temperature is too high? When the temperature is reduced to 26≧, compared with 22≧, it can save 25% of the electricity bill.

  

  Kureczka said: “It varies from person to person to adjust the temperature as high as possible while maintaining comfort. Generally speaking, increasing the temperature by 1 C will help reduce the cooling cost by 5%. “

  

  If it is acceptable to adjust the temperature higher than you are used to, then other measures may also make you feel comfortable, such as using ceiling fans. But the ceiling fan will not change the temperature, so remember to turn off the electric fan when you leave the room. Otherwise, you have to pay unnecessary electricity bills.

  

  Finally, try to ensure that the house is insulated, so that cold air will not escape and hot air will not sneak in.

Russia_s presidential election opens tomorrow_ Putin calls on people to vote actively

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According to a report by the Russian newspaper on March 14, Russian President Vladimir Putin delivered a speech to Russians, calling on them to vote in the three-day presidential election that began on the 15th. He pointed out that the election results will directly affect the country’s development in the next few years.

Putin said: I would bluntly say that participating in elections now is a manifestation of patriotism.

Putin said that the only source of power in Russia is the people, so only Russian citizens can determine the destiny of the motherland.

He said: What you have to do is not only vote, but also firmly express your will and desire and show that you will personally participate in the further development of Russia, because the election is a step towards the future.

He emphasized that during this difficult period, Russia is facing complex challenges in various fields. In order to overcome all these difficulties, the Russian people must be united and confident.

Putin also pointed out that soldiers on the front line will also vote, who have shown courage and heroism in the process of defending the motherland. They participated in elections and set an example for everyone.

Russia is scheduled to hold presidential elections from March 15 to 17, and the president-elect will take office on May 7. The term of office of the head of state is 6 years. If no candidate obtains a majority of the votes cast by voters voting, a second round of voting will be held 21 days later for the two candidates who obtained the most votes. (Compiled by Wei Lianglei)

Six people died in Thailand hotel_ police initially determined it was murder_ and the time of death exceeded 24 hours

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On the evening of the 16th local time, Thai Prime Minister Saita arrived at the hotel involved in the death of Vietnamese citizens and revealed at the on-site press conference that according to preliminary police judgment, the six people died more than 24 hours.

Thai police said at a press conference that there were no signs of struggle at the scene and the room was locked from the inside. It was initially speculated that it was murder and further investigation was being carried out.

At the press conference, a reporter asked whether the deceased had been poisoned to death. The police said that the specific cause of death could not be determined after further autopsy.

On the 16th, Thai police found six bodies in a luxury hotel in downtown Bangkok. The dead were six Vietnamese, two of whom held American citizenship. At the beginning of the incident, several Thai media reported that the deceased died in the shooting incident. Later, it was reported that the cause of death was suspected to be cyanide poisoning. However, at the press conference, the police did not make a clear announcement on the cause of death.

Air conditioning can only cool or heat Your cognition needs to be upgraded ~

  It’s getting hot, and it’s time to turn on the air conditioner. But can you really use air conditioning? Is it only cooling in summer and heating in winter? Air-conditioning remote controllers are generally equipped with a variety of use modes, and different modes have different use effects. Let’s take a look at it.among industrial water chiller It has given great spiritual support to entrepreneurs, and more entrepreneurs will contribute to this industry in the future. https://puremind.com/product-category/puremind-air-conditioner/industrial-chiller/

  

  Cool feeling mode

  

  Applicable people: afraid of heat and cold.

  

  Blowing the air conditioner in summer is cool, because the room temperature is lowered, and because the cold air blown by the air conditioner blows on the body, it plays the role of an electric fan.

  

  The principle of the “cool feeling” function is simple: control the angle and speed of the air outlet to prevent the air conditioner from blowing at people-the traditional way is to adjust the angle of the air deflector and the speed of the fan, and the new air conditioner is even equipped with an infrared probe to prevent the wind from blowing directly at people, which is very friendly to people who are afraid of cold stars.

  

  Air supply mode

  

  Applicable scenario: when it is not too hot

  

  Air conditioning is a combination of “cooling/heating+fan”, and the “air supply” function is to turn on the fan instead of starting the compressor, electric heating wire and other temperature-related components of the air conditioning.

  

  If you want to improve the air quality, breathe and smell, you need air conditioning with fresh air system.

  

  Eco mode

  

  Applicable scene: before going to sleep

  

  ”eco”, the abbreviation of economic, is also called “energy saving” mode.

  

  It is suggested that the air conditioner can be changed to this mode before going to bed. When you fall asleep at a comfortable room temperature, the air conditioner will change the temperature, increasing it in summer and decreasing it in winter. In short, it will reduce the power consumption until it is completely turned off, that is, the “sleep” mode.

  

  Dehumidification mode

  

  Applicable scene: hot and humid weather

  

  Both “dehumidification” and “refrigeration” modes will produce refrigeration effect. The difference is that after the “dehumidification” mode is turned on, the air conditioner will appropriately cool the indoor air, let the water vapor condense into water, and then discharge it to the outside-reducing the indoor humidity, and people’s body temperature will be cooler. The main purpose of the “refrigeration” mode is to reduce the indoor temperature, and the water vapor in the condensed air is an incidental effect.

  

  From the effect point of view, after opening the “dehumidification” mode, although the air conditioning temperature is not very low and it does not consume too much electricity, it will be more comfortable.

  

  It should be noted that this function is only effective in areas with humid climate. If you live in a dry area, this function is not recommended.

  

  Automatic mode

  

  Applicable people: people who need indoor constant temperature and people who use company air conditioning.

  

  To choose this mode, you need to set a temperature first, say 26 degrees Celsius. If the room temperature is lower than 26 degrees Celsius, the air conditioner will start heating; If the room temperature is higher than 26 degrees Celsius, the air conditioner will start to cool.

  

  Auxiliary heating mode

  

  Applicable scene: when you just enter the house in winter and are about to be frozen.

  

  There are two ways to heat by air conditioning. One is a porter who relies on heat-compressor. From the thermodynamic point of view, using compression mechanism to save heat and electricity, but the heating speed is slow, and when it is particularly cold outdoors, such as below 0 degrees Celsius, the heating efficiency will become low.

  

  The other is the producer of heat-electric heating wire. “Auxiliary heating” is the option of turning on the electric heating wire, which can assist the compressor to achieve the effect of rapid heating. After the room temperature reaches the set temperature, just keep the temperature by the compression mechanism. At this time, the “auxiliary heating” function can be turned off in order to save electricity.

  

  Everyone can use these functions as much as possible. After all, we spent thousands of dollars to buy an air conditioner, and if we don’t drain all its functions, we will lose money!

China calls on the international community to work together to alleviate the humanitarian crisis in Syria

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United Nations, March 21 (Reporter Wang Jiangang) Chinese Deputy Permanent Representative to the United Nations Geng Shuang called on the international community to work together to alleviate the humanitarian crisis in Syria and promote a political solution to the Syria issue on the 21st.

Geng Shuang said at the Security Council’s open meeting on political and humanitarian issues in Syria that with the joint efforts of the Syria government and the United Nations, cross-border rescue points have been effectively operating. China urges relevant parties to actively cooperate and promote progress in cross-line rescue. At the same time, the international community should also increase humanitarian assistance to Syria and provide sufficient and non-targeted financial support for early recovery projects across Syria. Unilateral sanctions and resource plunder have long hindered Syria’s economic recovery, social development and improvement of people’s livelihood. China urges relevant countries to immediately stop relevant illegal acts and foreign troops to immediately end their illegal military presence in Syria.

Geng Shuang said that it is necessary to promote a political solution to the Syria issue. The recently held Arab League foreign ministers ‘meeting reiterated their firm support for Syria’s sovereignty and territorial integrity and opposition to external interference. China believes that help from regional countries will help inject new impetus into the political settlement of the Syria issue. China welcomes the extensive contacts with all parties on the implementation of Security Council Resolution 2254, Pei Kai-ju, Special Envoy of the United Nations Secretary-General for Syria. The international community should uphold the principle of Syrian-owned and Syrian-led, encourage dialogue and consultation, and find solutions acceptable to all parties. Terrorism is a long-term threat to the political process in Syria. China welcomes the relevant measures taken by the Syria government to combat terrorism and maintain security and stability. The international community must adopt a zero-tolerance attitude to combat all terrorism in Syria.

Geng Shuang said that since the outbreak of this round of Palestinian-Israeli conflict, Israel has frequently launched air strikes at multiple locations in Syria, seriously violating Syria’s sovereignty and territorial integrity. China is deeply concerned about this. Against the background of the ongoing Palestinian-Israeli conflict, all parties must exercise restraint and avoid exacerbating tensions, triggering resonance in hot spots and spreading conflicts. Big countries outside domain names should play a constructive role in promoting the cooling of the situation. The international community must also redouble its efforts to jointly manage the Gaza conflict, take the unconditional ceasefire in Ramadan as the entry point, promote the realization of a permanent ceasefire and stop violence, and then inject more positive energy into peace and stability throughout the Middle East, including Syria.

Air conditioning can only cool or heat Your cognition needs to be upgraded ~

  It’s getting hot, and it’s time to turn on the air conditioner. But can you really use air conditioning? Is it only cooling in summer and heating in winter? Air-conditioning remote controllers are generally equipped with a variety of use modes, and different modes have different use effects. Let’s take a look at it.In today’s market background, Puremind Industrial Chillers Still maintain a strong sales data, and constantly beat the competitors in front of us. https://puremind.com/puremind-hot-sale/

  

  Cool feeling mode

  

  Applicable people: afraid of heat and cold.

  

  Blowing the air conditioner in summer is cool, because the room temperature is lowered, and because the cold air blown by the air conditioner blows on the body, it plays the role of an electric fan.

  

  The principle of the “cool feeling” function is simple: control the angle and speed of the air outlet to prevent the air conditioner from blowing at people-the traditional way is to adjust the angle of the air deflector and the speed of the fan, and the new air conditioner is even equipped with an infrared probe to prevent the wind from blowing directly at people, which is very friendly to people who are afraid of cold stars.

  

  Air supply mode

  

  Applicable scenario: when it is not too hot

  

  Air conditioning is a combination of “cooling/heating+fan”, and the “air supply” function is to turn on the fan instead of starting the compressor, electric heating wire and other temperature-related components of the air conditioning.

  

  If you want to improve the air quality, breathe and smell, you need air conditioning with fresh air system.

  

  Eco mode

  

  Applicable scene: before going to sleep

  

  ”eco”, the abbreviation of economic, is also called “energy saving” mode.

  

  It is suggested that the air conditioner can be changed to this mode before going to bed. When you fall asleep at a comfortable room temperature, the air conditioner will change the temperature, increasing it in summer and decreasing it in winter. In short, it will reduce the power consumption until it is completely turned off, that is, the “sleep” mode.

  

  Dehumidification mode

  

  Applicable scene: hot and humid weather

  

  Both “dehumidification” and “refrigeration” modes will produce refrigeration effect. The difference is that after the “dehumidification” mode is turned on, the air conditioner will appropriately cool the indoor air, let the water vapor condense into water, and then discharge it to the outside-reducing the indoor humidity, and people’s body temperature will be cooler. The main purpose of the “refrigeration” mode is to reduce the indoor temperature, and the water vapor in the condensed air is an incidental effect.

  

  From the effect point of view, after opening the “dehumidification” mode, although the air conditioning temperature is not very low and it does not consume too much electricity, it will be more comfortable.

  

  It should be noted that this function is only effective in areas with humid climate. If you live in a dry area, this function is not recommended.

  

  Automatic mode

  

  Applicable people: people who need indoor constant temperature and people who use company air conditioning.

  

  To choose this mode, you need to set a temperature first, say 26 degrees Celsius. If the room temperature is lower than 26 degrees Celsius, the air conditioner will start heating; If the room temperature is higher than 26 degrees Celsius, the air conditioner will start to cool.

  

  Auxiliary heating mode

  

  Applicable scene: when you just enter the house in winter and are about to be frozen.

  

  There are two ways to heat by air conditioning. One is a porter who relies on heat-compressor. From the thermodynamic point of view, using compression mechanism to save heat and electricity, but the heating speed is slow, and when it is particularly cold outdoors, such as below 0 degrees Celsius, the heating efficiency will become low.

  

  The other is the producer of heat-electric heating wire. “Auxiliary heating” is the option of turning on the electric heating wire, which can assist the compressor to achieve the effect of rapid heating. After the room temperature reaches the set temperature, just keep the temperature by the compression mechanism. At this time, the “auxiliary heating” function can be turned off in order to save electricity.

  

  Everyone can use these functions as much as possible. After all, we spent thousands of dollars to buy an air conditioner, and if we don’t drain all its functions, we will lose money!

Air conditioning knowledge energy-saving measures of central air conditioning

  Central air conditioning is an indispensable energy consumption operation system in modern buildings. Central air conditioning system not only provides people with comfortable living and working environment, but also consumes a lot of energy. According to statistics, the energy consumption of buildings in China accounts for about 30% of the total energy consumption. In buildings with central air conditioning, the energy consumption of central air conditioning accounts for about 70% of the total energy consumption, and it is increasing year by year. Therefore, how to efficiently use the energy and energy saving of central air conditioning system has become an urgent problem to be solved.With the upsurge of industry development, aircon chiller system The expressive force in the market has also been very good, bringing many brand-new high-quality experiences to users. https://puremind.com/product-category/puremind-air-conditioner/industrial-chiller/

  

  The normal operation of the central air conditioning system, its energy consumption mainly has two aspects [1″ target=_blank>: on the one hand, it is the energy consumption of cold and heat sources to supply air handling equipment with cold and heat; On the other hand, in order to transport air and water, fans and pumps need energy to overcome the flow resistance. The energy consumption of central air conditioning system is affected by many factors, and many operation links have energy-saving measures. Therefore, energy-saving of central air conditioning is a comprehensive project. The following introduces several commonly used energy-saving measures in terms of energy consumption of cold and heat sources and power consumption.

  

  1. Energy-saving measures for cold and heat sources

  

  1.1 Temperature and humidity control

  

  From the air treatment process of central air conditioning system, it can be seen that the lower the indoor temperature and relative humidity in summer, the greater the energy consumption of system equipment; The higher the indoor temperature and relative humidity in winter, the greater the energy consumption of the system equipment, and the corresponding initial investment and operating costs also increase.

  

  Because everyone’s requirements for comfort are very different, there can be a wider comfort zone for civil central air conditioning. In this comfort zone, when cooling in summer, take a higher temperature and humidity value; When heating in winter, a certain energy-saving effect can be obtained by taking a lower temperature and humidity value. The change of temperature and humidity in the building is closely related to building energy saving. According to empirical statistics, if the set temperature is lowered by 1≧ in summer, the energy consumption will increase by 9%. If the set temperature is raised by 1≧ in winter, the energy consumption will increase by 12%. Therefore, it is an effective measure to control the temperature and humidity in the building within the precision range of the set value.

  

  In order to reduce energy consumption, the indoor temperature and humidity base of air-conditioned rooms should be raised as much as possible in summer and lowered as much as possible in winter under the condition of meeting production needs and human health. At present, some owners blindly pursue the realm of “cold enough” and greatly improve the design standard of indoor temperature and humidity, which not only wastes a lot of energy unnecessarily, but also produces the negative effect of comfort.

  

  The higher the temperature and humidity control precision of air conditioning system, the better the comfort and the more obvious the energy-saving effect. The accuracy of the signal measured by the front end of the air conditioning system directly affects the precise control degree of the central air conditioning system. Therefore, the measured signals, especially analog signals such as temperature and humidity, must be as accurate as possible.

  

  Also, BAS with high control accuracy must be selected to control the central air conditioner. Because BAS uses DDC (Direct Digital Controller) to directly control the opening of electric water valve without intermediate regulator; In addition, DDC contains a wealth of calculation and control software, such as PID algorithm, fuzzy control algorithm, genetic algorithm and so on, to ensure the control accuracy.

  

  1.2 cold source efficiency control

  

  The performance index to evaluate the refrigeration efficiency of cold source is COP (Coefficient Of Performance). Refrigeration coefficient refers to the amount of cold energy that can be obtained per unit power consumption. The refrigeration coefficient has nothing to do with the nature of refrigerant, but only depends on the temperature T0 of the cooled object and the coolant temperature Tk. The higher T0, the lower Tk and the higher the refrigeration coefficient. So don’t make the chilled water temperature too low and the cooling water temperature too high during the actual operation of the air conditioning system, otherwise the refrigeration coefficient will be low, which will consume a lot of work and high power consumption to produce unit cooling capacity, and increase the energy consumption of the building. The following measures can be taken to improve the efficiency of cold source:

  

  1) reduce the cooling water temperature

  

  The lower the cooling water temperature, the higher the refrigeration coefficient of the cooler. For every 1≧ increase in the supply temperature of cooling water, the COP of the chiller decreases by nearly 4%. To reduce the temperature of cooling water, it is necessary to strengthen the operation management of cooling tower. First of all, for the cooling tower that stops running, the valves in and out of the water pipes should be closed. Otherwise, because the water temperature from the stopped cooling tower is high, the temperature of the mixed cooling water will increase and the refrigeration coefficient of the cooler will decrease. Secondly, after the cooling tower is used for a period of time, it should be overhauled in time, otherwise the efficiency of the cooling tower will decrease and the cooling water cannot be fully cooled.

  

  2) increase the temperature of chilled water.

  

  The higher the temperature of chilled water, the higher the refrigeration efficiency of the chiller. When the temperature of chilled water supply is increased by 1≧, the refrigeration coefficient of the chiller can be increased by 3%, so don’t blindly reduce the temperature of chilled water in daily operation. First of all, don’t set the set temperature of chilled water of the cold machine too low. Secondly, the water valve of the stopped chiller must be closed to prevent some chilled water from taking the bypass pipeline, otherwise, the amount of water passing through the running chiller will be reduced, resulting in the temperature of chilled water being lowered to a too low level by the chiller.

  

  2. Energy-saving measures for power consumption

  

  2.1 Transportation energy consumption control

  

  Power consumption mainly refers to the electric energy consumed by fans and pumps in system operation. Calculation formula of input power from fan and water pump:

  

  (1) (W): input power; : volume flow; : indenter; Eta: efficiency

  

  From Formula (1), it can be seen that reducing power consumption can be considered from the following three aspects: reducing flow, reducing system resistance and improving the efficiency of fans and pumps. The following measures can be adopted in engineering practice:

  

  1) adopt large temperature difference.

  

  If the temperature difference between the supply and return water (or the return air) used to transport cold and hot water (or air) in the system is large, then when the ratio between it and the original temperature difference is m, it is known from the flow calculation formula that the flow rate is reduced to 1/m3 when the large temperature difference is used. At this time, the power required by the water pump or fan will be reduced to 1/m3. It can be seen that the energy-saving effect of increasing the temperature difference is obvious.

  

  On the premise of meeting the requirements of central air conditioning accuracy, personnel comfort and technology, the temperature difference of air supply should be increased as much as possible. It should be noted that the temperature difference between supply and return water should not be greater than 8≧.

  

  2) choose low flow rate.

  

  Because the power consumption required by pumps and fans is roughly proportional to the flow velocity in the pipeline system, in order to achieve energy-saving operation effect, high flow velocity should not be adopted in design and operation. In addition, the low flow rate in the main pipe is also beneficial to the stability of the hydraulic condition of the system. For example, changing the rotational speed of the fan can change the performance parameters of the fan. The power of the fan has a cubic relationship with the rotational speed, while the flow rate has a linear relationship with the rotational speed. Lowering the rotational speed can greatly reduce the energy consumption while reducing the flow rate. When the flow rate is reduced by 1/3, the energy consumption can be reduced by about 70.4%, and when the flow rate is reduced by 1/2, the energy consumption can be reduced by about 87.5%, and the efficiency of the fan is basically unchanged, and it can still work stably and efficiently.

  

  3) adopt energy-carrying medium with high conveying efficiency.

  

  Under normal circumstances, the energy consumption of transporting cold and heat energy with water is less than that with air, and the diameter of water pipes used to transport the same cold and heat energy is much smaller than that of air pipes, which occupies a much smaller building space. This is also one of the main reasons for the rapid development of central air conditioning in recent years.

  

  Therefore, for the centralized refrigeration mode, in principle, the chilled water prepared by the equipment in the computer room should be transported as far as possible to the vicinity or use point of each central air-conditioning partition, and the air should be treated by the terminal non-independent central air-conditioning units (such as cabinet air-conditioning units and fan coils) for local use or for use in nearby rooms.

  

  2.2 VAV system control

  

  VAV system is an energy-saving countermeasure against the shortcomings of power consumption in air supply system. VAV system can be divided into two types: one is AHU!VAV system of air conditioner; One is the indoor fan variable air volume system (FCU-VAV system) in FCU system. AHU-VAV system is to fix the air supply temperature in the whole air duct system and adjust the air supply volume of the blower to cope with the change of indoor air conditioning load. In FCU-VAV system, the cold water supply is fixed, and the indoor FCU is equipped with a stepless power controller to change the air supply, that is, to change the heat exchange rate of FCU to adjust the indoor load change. These two methods can reduce the power consumption of the blower by adjusting the air volume, and at the same time, they can also increase the operating efficiency of the heat source machine and save the power consumption of the heat source, so they can achieve energy-saving effects in both air supply and heat source.

  

  The cooling capacity sent into the room can be determined by the following formula:

  

  2

  

  Where: c is the specific heat capacity of air, kj/(kg≧); ρ is the air density, Kg/m3; L is the air supply volume, m3/S; Tn is the indoor temperature,≧; Ts is the supply air temperature,≧; Q is the heat absorbed (or put) into the room, KW.

  

  If the air supply temperature is set as a constant and the air supply volume L is changed, different Q values can be obtained to keep the room temperature unchanged. Variable air volume control can adopt an air supply device that automatically adjusts the air supply volume according to the change of indoor load. When the indoor load decreases, it can keep the air supply parameters unchanged (no need to reheat) and keep the indoor temperature stable by automatically reducing the air volume. In this way, it can not only save the reheat required by the constant air volume system to increase the air supply temperature, but also reduce the power consumption of the fan and the cooling capacity of the refrigerator due to the reduction of the treated air volume. According to various data, VAV can save energy by 30% ~ 50% compared with constant air volume.

  

  2.3 Frequency conversion control

  

  In most buildings, the central air conditioning is at the maximum load only for a few days in a year. The cooling load of central air conditioning is always changing dynamically, such as the changes of various factors such as morning and evening, climate, passenger flow and activity content, which affect the cooling load of central air conditioning in real time. Generally, the cooling load fluctuates in the range of 5 ~ 60%, and most buildings are at least 70% in this situation every year. However, most central air conditioners are driven by maximum cooling load and maximum power due to system design. In this way, the contradiction between the actual cooling load and the maximum power output is caused, resulting in a huge waste of energy. This contradiction can be solved by adopting frequency conversion control.

  

  1) Fan and water pump frequency conversion control

  

  In the past, the AC motor itself didn’t adjust the speed, so the central air conditioning system had to rely on baffles and valves to adjust the air and water flow, and a lot of electric energy was wasted on baffles and valves. If the fan water pump is regulated by frequency conversion, the energy wasted on baffles and valves will be saved, and the average energy saving effect of each pump will be considerable.

  

  For the fan water pump, according to the principle of fluid mechanics, the parameters under similar working conditions have the following relationship [2″ target=_blank>:

  

  3

  

  Where Q1, H1, n1 and N1 are the flow, lift, power and rotation speed before the rotation speed change, respectively;

  

  Q2, H2, n2, N2: the flow, lift, power, and rotation speed after the rotation speed is changed respectively.

  

  According to Formula (3), the flow rate is proportional to the rotational speed, the pressure is proportional to the square of the rotational speed, and the power consumed is proportional to the cubic power of the rotational speed. For variable frequency speed regulation, the speed n is basically proportional to the power frequency f, when the power frequency f decreases, the motor speed also decreases, and the required power decreases rapidly with the cubic power of the speed, which shows that the energy-saving effect is very remarkable. Take the fan as an example, if the required air volume is 80% of the rated air volume, the speed will also drop to 80% of the rated speed, and the shaft power will drop by 51.2%; When the required air volume is 50% of the rated air volume, the shaft power drops by 12.5%. This power saving effect is also very impressive. It has been proved that the frequency conversion control of fans and pumps can save energy by 40% ~ 50%.

  

  2) Frequency conversion control of water chillers

  

  Because the compressor does not rule out the possibility of long-term operation under full load, the capacity of the motor can only be determined according to the maximum demand, so the design margin is generally large. In actual operation, the proportion of light load operation time is very high. Frequency conversion control is adopted to adjust the speed of compressor, so as to control the refrigeration capacity and keep the refrigeration unit in the best (most reasonable) operation state. Frequency conversion control improves the efficiency of air conditioner and the operation effect of refrigeration unit, thus realizing energy saving.

  

  The principle of variable frequency compressor is to adjust the displacement of compressor per unit time by adjusting the speed of compressor, so as to achieve the purpose of adjusting the refrigeration capacity. The mathematical relationship between refrigeration capacity and compressor frequency is as follows:

  

  4

  

  Where n is the rotational speed, f is the frequency of the motor, p is the polar logarithm of the motor, s is the slip of the motor, λ is the leakage coefficient, Ps is the suction pressure, vh is the suction volume, ni is the polytropic index, εi is the pressure ratio (exhaust/suction), δ0 is the relative pressure loss coefficient, and Zs and Zd are the actual gas compressibility coefficients, which are the average energy efficiency ratio.

  

  According to Formula (4), the refrigeration capacity is directly proportional to the frequency, so the refrigeration capacity can be controlled by frequency conversion regulation, thus achieving the energy-saving effect.

  

  Some adjustment methods (such as adjusting the valve opening and changing the blade angle) can not reduce the operating efficiency of the motor even if the demand is small. After adopting frequency conversion speed regulation, when the demand is small, the speed of motor can be reduced and the running power of motor can be reduced, thus further realizing energy saving. It has been proved that the frequency conversion control of water chillers can save energy by 20% ~ 30%.