Is central cooling feasible? Will it save costs than air conditioning?

Because central heating will be provided in winter in the north, central cooling should also be possible.

There is no cost saving at all.

Let's talk about the benefits of central cooling.

First of all, central refrigeration is indeed much more environmentally friendly than air conditioning with freon as refrigerant. Secondly, compared with using air conditioning system separately in each room, the hardware equipment of centralized refrigeration is indeed much cheaper than buying air conditioning. Take our home as an example, the price of buying a fan may be half lower than that of ordinary air conditioners. In addition, if refrigeration is centralized, there is no need to install cabinet air conditioners and compressors, so the home is more space-saving. Moreover, the air outlet is much larger than the air conditioner, and the cooling effect is faster. Thirdly, from the perspective of the whole community, because every household is not equipped with air conditioning, the overall environment of the community, especially the facade, will be better. Finally, the maintenance cost of central cooling is lower than that of air conditioning, because there are only fans at home, so there are fewer problems. If there is a problem, it is much more convenient than air conditioning maintenance, because it is a supplier's lifelong maintenance, and we are in Yin Tian geothermal.

Well, finally, the cost.

The cost of central refrigeration is much higher than that of air conditioning. Take our community as an example, the charging standard of geothermal energy in Yin Tian is: 0.2 yuan per square meter every day, and the cooling season is fixed from June 15 to September 15, and ***90 days, one summer, calculated at 100 square meter, and the cooling fee is 1800. In addition, fans in central cooling homes also consume electricity.

Secondly, central refrigeration is not free, which further increases the extra cost. The time for centralized cooling is fixed every year. From June 15 to September 15, the thunder can't move. For example, the unusually high temperature in the north this year still cannot provide cooling in advance. This is the idea of suppliers charging extra. If you want to provide cooling in advance, you must continue to pay, about every day in 50 yuan. This is very unreasonable. Every summer, there are complaints in the community, but there is nothing I can do. It is not allowed to install air conditioning (this is another complicated problem, which has nothing to do with the topic, so it will not be expanded).

Central cooling time is not free.

Thirdly, if there is no one at home this year, can I not pay the fee? No, you still have to pay 60% cooling fee, that is, 1800x0.6, because it is centralized cooling after all, and if the number of users is small, the supplier will definitely lose money.

In a word, central refrigeration is certainly beneficial, but if it is simply from the perspective of cost, the cost is definitely much more expensive than air conditioning.

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Published on July 25, 2023. The copyright belongs to the author.

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If you don't understand, ask, isn't freon already eliminated? [curious] [curious]

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It is very hot in summer, and many shopping malls and office buildings provide centralized cooling. Is it possible for residential buildings to provide centralized cooling, and will it save costs compared with air conditioning?

Dreadwind

Twenty-eight people agreed and seven people liked the answer.

Theoretically, it is completely possible. Even in those days, we did a feasibility study and changed the gas-fired generator set in Beijing into cogeneration. Central cooling can be achieved by directly using steam from power plants. Steam+lithium bromide central air conditioning. It is much more economical than electricity. When doing the feasibility study, I considered that several nearby buildings can be filled with steam, cooled in summer and heated in winter. Give play to the maximum efficiency of the unit. The combined thermoelectric/electric cooling energy supply of the generator set provides over 80% efficiency. The power generation efficiency alone is 50%. Simply let the generator set supply steam refrigeration in summer, and the efficiency of the power plant is improved by 30%. Needless to say, the efficiency of central air conditioning is much higher than that of ordinary household electric air conditioning. Calculated with toes, it is considered as centralized refrigeration. For ordinary people, it is a good thing to give consideration to energy conservation, environmental protection and money saving. Steam lithium bromide refrigeration wanted to see the principle directly, and finally landed, only giving myself all the way to the factory and the relatives' hospital of a nearby military region. Haha, the ideal is full, and the reality is so skinny. It's really a bit difficult to promote. First of all, it is really not difficult to achieve. The central air conditioner in the main room can be steam lithium bromide or pure electric refrigeration, but the extension of each household is coil+fan. The whole coil is copper pipe, which takes hot water in winter and cold water in summer. Blow warm air and cold air through the fan. Look at the schematic diagram and realize it more directly. Take Beijing, a city with central heating in winter, as an example. Many buildings, hospitals and some institutions were built in 1970s and 1980s. At first, only the heating was designed, and groups of radiators were on the wall. Air conditioning was out of fashion in those years, and electric fans were blown in summer. After the 1990s and the new century, the unit began to transform the heating pipes into central air-conditioning water pipes. Cold water in summer and hot water in winter. Transform the radiator into a fan to blow out the air. See the figure below. On the left is the radiator of heating. On the right is the reconstructed wall-mounted indoor air conditioning unit, that is, the floor-mounted fan coil unit. Cold wind blows in summer and hot wind blows in winter. This kind of fan-coil unit with improved heating is most common in the outpatient departments of some hospitals in Beijing, that is, the rooms where doctors treat patients and the doctors' offices. I took my mother to see a doctor a while ago. She said that something blew on her back, which made her cold all over. I quickly pulled her aside and said, this is a floor-standing air conditioner extension, and the whole room is blown out from this extension. However, the largest amount of ownership is still in the old office buildings of government agencies and institutions, which is invisible to people who don't usually go to the commission office. In the newly-built building, most indoor extensions of central air conditioning are embedded in the ceiling. The one on the left is common in shopping malls and supermarkets, and the one on the right is common in home offices. To tell the truth, it is difficult for people who are unwilling to directly transform the radiator to connect the air conditioning pipes all the way before entering the house, but it is not impossible. Let's get back to the point. North of Qinhuai, a residential area with central heating radiator is installed. The transformation is difficult, but the residents' will is not very high. As we mentioned earlier, we only settled the relatives' hospital and paid for heating and cooling. At that time, developers were not interested in the new buildings around them. There is no further contact. compare ...

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Do you choose central air conditioning or ordinary split air conditioning for home use?

Big picture 19 19

2093 people agreed and 256 people liked the answer.

A bunch of soft articles, don't believe it! ! ! Daughter-in-law was tricked into installing central air conditioning in her new house and moved in for a year. I have turned black, which is not a common occurrence. A bunch of articles talk about principle, structure and black technology. Have you ever wondered what I bought it for? Isn't it enough to buy an air conditioner for cooling and heating, with little wind noise and trouble-free temperature regulation? It is too difficult to buy a central air conditioner at home. Have you ever bought a father? No matter what advantages are actual or potential, let the soft text finish, and I will say: 1, the installation of central air conditioning is delayed, and the extension pipe has to pass through the beam. At present, there is basically no reserved hole through the beam in the house. The pipe made such a big hole in the beam that the steel bars were broken. Don't tell me it's okay. I am a civil engineer, and I can't live without steel bars. This problem is even bigger and more serious, which makes your beam dry. No kidding. Both the central air conditioner and the fresh air device belong to my wife Luo Zhang. After the installation, I took a look and cursed directly. Does md have a conscience? In order to break the money, structural safety is not considered at all ~ the use effect of central air conditioning is directly related to the installation master's skill. There was something wrong with my air conditioner, so I went to after-sales service. After reading my machine, I was speechless. The outdoor unit was roughly installed and the insulation cotton was not wrapped. The installation level of several indoor units is uneven. Some drainage pipes are at the wrong angle and some are not well sealed. The wind wheel is almost covered with decorative dust. After the transformation, it is difficult to adjust the installation problem because the indoor unit and pipeline are wrapped. Don't tell me there's a trial machine. Central air conditioning is installed in the early stage of renovation. If you want to complete the trial run completely, you should be prepared to lose the warranty for at least a few months. My home decoration was originally a Buddhist department, but because the epidemic was interrupted for two years, the occupancy warranty has been more than half. An indoor unit in my house is basically useless after checking in. Before over-warranty, I accidentally found that the motor was faulty and abnormal. You know, we've only lived here for a few months. If it is over-insured, we will replace it at our own expense. Central air conditioning claims to save space, save height, and the installation is hidden and beautiful, but it is not necessarily true. If you want to look good, the central air conditioner should also have a ceiling, and at least one wall ceiling should be sealed, which takes up a lot of height. Obsessive-compulsive disorder should be flat-topped The split air conditioner can be installed at the top in a pre-planned position, and other people's shell design is already exposed, which is not ugly. 2. When I use my air conditioner, I feel that the cooling is slow and I can't get it down. The original supplier came to check and said no problem. We found another supplier nearby and brought an old master. After inspection, we found that the fluorine pressure in the outdoor unit was not enough, and it was not fully charged during installation. I just want to calm down. Do you still need to know this? After filling, I feel that the refrigeration is still slow. The master told me that there is no way to make a lot of money. That's it. The wind blown by others is healthy, gentle and not irritating. In other words, the wind is small and the cooling is slow. If you want to cool quickly, you can't calculate according to the reference power given by the manufacturer, you have to add power (add money). I want to explain that not all central air conditioners have this problem. My relative's Mitsubishi refrigeration is faster than the wind noise, and Toshiba refrigeration is also quite fast. Not recommended. But to solve this problem, we must first remove the ceiling. Is there any trouble with split air conditioning? Then there is noise. It was quiet at first, and it took two. ...

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Which brand of air conditioner is better?

Chen Xiaoshao

3,650 people agreed. 1 164 people like this answer.

No matter what brand or model you buy, if you use r32 or r4 10a refrigerant, you must keep an eye on the air conditioner installer and smoke! Really! Empty! Last year, when my father installed air conditioning in his room, he almost had an accident. I went to see it when the air conditioner installer put the outdoor unit on. I didn't see the vacuum pump, so I asked one more question: "where is your vacuum pump?" This is a frequency converter. " An embarrassed expression appeared on his face, and he asked another helper to drive to get the vacuum pump. If my parents were present instead of me, the air conditioner might be scrapped, and the words "use r32 refrigerant" were printed on the package of the air conditioner. After he brought the vacuum pump, another thing happened that annoyed me. After vacuumizing, close the valve before cutting off the power supply. He actually cut off the power first, then I pointed out his mistake, and then he operated it again. Considering that they braved the high temperature of 35 degrees to install air conditioners, I didn't show any negative emotions. However, I don't know how many inverters these two men destroyed. Perhaps this is the source of some comments on "poor refrigeration effect of xx brand air conditioners" on the Internet. In TCL training, I often mentioned that "air conditioning installation has three points of quality and seven points of quality." I would like to mention here that you must read the instruction manual carefully after delivery and before installation, which mentions the installation precautions. When installing, you must pay attention to the operation process of the installation master. Ask questions in time. Call complaints when necessary. After all, this is your hard-earned money.

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Comment no 382

Can anyone tell the truth, which is more cost-effective than central air conditioning or ordinary air conditioning?

Zhang Xiao

180 people agreed and 53 people liked the answer.

In short, if your home has the same time, please note that there is an actual area of about 100m that needs cooling or heating, so choose the central air conditioner, otherwise the central air conditioner can't compare with the traditional split hanging machine from any angle. Why? Air conditioning is nothing more than two o'clock. Energy-saving and comfortable. Let's talk about comfort first. I never quite understood. How did the conclusion that central air conditioning is more comfortable come from? Split hanging air conditioner, the basic function of indoor comfort can be bought within 2500, and the machine with thermal imaging can be bought around 4000, which can better monitor the temperature of the whole room. Does the central air conditioner have even a whole room temperature control technology? I am ignorant, can you tell me? But the biggest problem of central air conditioning is energy saving. Generally speaking, turning on the air conditioner in the home environment is usually considered by people or pets when they are in the room or ready to go to the room, right? Well, at half past two in the morning, you and your wife are sleeping in the bedroom, and your daughter is sleeping in the bedroom. Should the air conditioner in your living room be turned on at this time? You think I'm crazy, right? Go back to my original words. Why did I say that when you have an area of 100㎡ and need cooling or heating, central air conditioning is a good choice? This time point is basically inverter air conditioning, right? Any household split air conditioner with first-class energy efficiency of 1.5p has a minimum power of about 150w, which can reach a cooling capacity of about 600w. This data can ensure that the temperature of the whole bedroom environment can be within the range you set, because after your room cools down or heats up, you only need to maintain it, and you don't need the compressor to run at full power. The problem with central air conditioning is that its lowest power, even if it is one engine for two, is above 1000w, and the cooling capacity and heating capacity are around 3000w W ... then the problem comes at this time. Generally speaking, according to the building environment of our country, the story height is about 3m, 10 square meter. Under the condition of glass vacuum insulation, the required cooling and heating capacity is about 50-60w/㎡, and the average family bedroom is about10-18m2. In other words, a bedroom in China needs about 500w- 1000w to maintain the temperature set by the air conditioner. Even according to such a bad figure as cop=3, the actual electricity consumption is about 170-300 W, which is basically easily achieved by domestic first-class energy-efficient air conditioners at present, that is to say, for eight hours a night, the electricity bill of split air conditioners is about 1.3 kWh to 2.4 kWh. Because the lowest power of central air conditioner is about 1000w, it will start like a fixed frequency air conditioner, and the compressor will run. Then the cooling capacity of 3000w will suddenly drop the temperature above the set temperature, and then stop, wait until the temperature rises to a certain amount, and then suddenly cool down according to the cooling capacity of 3000 W. This way not only consumes electricity, but also has poor comfort. Anyone who has used a fixed frequency air conditioner should know what I'm talking about. So I said, if you have an area of 100㎡ and need cooling and heating at the same time, you can consider central air conditioning. Or, if your home has four rooms at the same time at night, think again.

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Why is it hot when the outdoor temperature is 26℃ and cool when the air conditioner is adjusted to 26℃?

Zhengzhou in addition to formaldehyde Lao Feng

33 people agreed. 19 people like this answer.

1, clarifying the concept It seems that most people don't realize the essence of this problem. Few people have thought about this question: what does it mean to adjust the air conditioner to 26 degrees? Many people think that the air conditioner is set at 26 degrees, and the wind blown by the air conditioner is 26 degrees. If you measure the air outlet of the air conditioner with a thermometer, you will find that the temperature of the air outlet is much lower than 26 degrees. For the time being, you are talking about fluorine system air conditioners widely used in household air conditioners (but not limited to R22 refrigerants, including R32 and R4 10). The temperature difference of air conditioner in fluorine system is large, the air volume is small, and the air is transported at the dew point (5- 12 degrees, which fluctuates according to the environmental temperature, evaporator fins and other specifications). So this kind of air conditioner is set to 18 degrees or 26 degrees. The air outlets are all at 5- 12 degrees. In fact, the temperature of the air outlet is not the control object of the air conditioner, but the temperature of the return air, which is the temperature of the air inlet of the air conditioner. General air conditioners are equipped with many high and low pressure detectors/switches in the condenser/system pipeline/gas-liquid pipeline, etc. Moreover, there are temperature sensors in the air return port, and some high-end ones have humidity sensors. When the temperature detection of the return air outlet reaches the set room temperature, if the air conditioner is fixed frequency, it will stop directly and restart after the temperature fluctuates. If the air conditioner is full DC frequency conversion, the threshold of the electronic expansion valve will be closed, the demand load will be reduced, and the compressor will start to output the demand load to maintain the room temperature at a low frequency. The so-called "air conditioning 26 degrees Celsius" by the subject, I think most people including the subject should understand that it is set to 26 degrees Celsius on the remote control. "Outdoor temperature of 26℃" refers to the outdoor temperature given by the Meteorological Observatory. The thermometer used by the meteorological station to measure this temperature is placed in a ventilated louver box 1.5 meters above the ground. But suppose that after turning on the air conditioner for a long time, the indoor temperature is basically maintained? A relatively stable situation. Why is the indoor temperature of 26 degrees important in this case? Feeling low outside? I think it goes back to the first time? Question: somatosensory temperature. Apparent temperature (English) refers to the degree of cold and warm that the human body feels, which is converted into the same temperature. 2. After defining the concept of principle, talk about principle. The first factor: the fundamental reason why heat transfer leads to human feelings as the subject said is that there are huge differences in environmental details. ,? Will the air-conditioned room be lost at 26℃? Measuring heat, outdoor 26℃? May absorb heat. ? First of all? How does the body feel cold and hot? What time? Body heat? Liu Yu? And then what? You will feel cold when the skin temperature is below 33℃. On the other hand, you feel hot. ? When the skin temperature is 33℃, both cold and heat receptors are activated. Body heat flow? Outflow is extremely sensitive. Let's suppose? Answer? In a room at 26℃? It feels neither cold nor hot, and the body surface temperature is around 33℃. ? Static thermal power? About 100W, what about his? At the same time, the human body radiates heat, however, convection, evaporation, breathing and so on. Where 100W heat energy is released to the environment. That is:? Body heat production =? The body radiates heat. At this time, he chose to enter? Air-conditioned room at 26℃. What if the air conditioner is on? , ...

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