Give two examples:
Air/air heat pump:
The split air conditioner used at home is the air/air heat pump, which transfers the cold and heat in the outdoor air to the indoor part to heat or cool the indoor air.
Air/water heat pump:
The air-cooled heat pump unit in central air conditioning is the air/water heat pump, which transfers the cold and heat in the outdoor air to water, and then uses the cold/hot water to heat or refrigerate the indoor air through the fan coil unit or the combined air conditioning box.
What is the difference between air conditioning and air source heat pump, and what principles are used respectively?
The biggest difference is the difference between users. The air conditioner uses cold energy on the evaporator side, and the heat pump uses heat on the condenser side. Gree air conditioner is good for air conditioning, and Fanny and Denon are good for heat pump. The principle used is the inverse Carnot cycle.
What is the working principle of air source heat pump?
Air-source heat pump, also known as heat pump water heater, absorbs air heat source by heat pump to make hot water, and its energy-saving efficiency is more than 4 times that of electric water heater, even more energy-saving than solar water heater. It is the most advanced energy-saving and environment-friendly hot water system in the world.
principle of operation
The heat pump uses the inverse Carnot principle to absorb a lot of low-temperature heat energy in the air with very little electric energy, which is converted into high-temperature heat energy through the compression of the compressor and sent to the water tank to heat hot water, so it has the advantages of low energy consumption, high efficiency, high speed, good safety, strong environmental protection and continuous supply of hot water. The working principle diagram of air source heat pump is hot water system, which has incomparable advantages. The heat pump hot water unit follows the law of conservation of energy and the second law of thermodynamics. Using the principle of heat pump, only a small part of mechanical work (electric energy) is needed to transfer heat in low temperature environment (atmosphere or groundwater, etc.). ) add it to a water heater in a high temperature environment to make high temperature hot water. A heat pump can be compared with a water pump. Water cannot spontaneously flow from a low place to a high place. To transport water from a low place to a high place, a part of electricity must be consumed by a water pump before it can be sent to a high water tank. Similarly, according to the second law of thermodynamics, heat cannot be spontaneously transferred (transferred) from a low temperature environment to a high temperature environment. In order to achieve this goal, some mechanical work (such as electric energy) must be consumed by machines in order to transfer heat from low temperature environment to high temperature environment. This kind of machine is called "heat pump". The function of heat pump is to take out the heat from air or low-temperature water, and send it to high-temperature environment for application together with the heat energy converted from electric energy used by itself.
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Air energy heat pump, what is commonly used for?
At present, air energy heat pump is widely used in hot water, heating and refrigeration in the market. Of course, there are other functions, such as dehumidification, but mainly the above three. Air energy water heaters (household) are popular in the southern market now, and the north has just begun. Commercialization is common in both north and south. Hotels, hotels, enterprises and institutions, schools, military units and other places that need these functions are very common.
What is an air source heat pump?
1, air energy water heater, also known as "air source heat pump water heater" and "cold air water heater". The "air energy water heater" absorbs the low-temperature heat in the air and converts it into high-temperature heat energy after being compressed by the compressor to heat the water temperature. The air energy water heater has the characteristics of high efficiency and energy saving. The consumption cost of the air energy water heater is only 1/4 of that of the electric water heater and 1/3 of that of the gas water heater, which is more energy-saving than the electric auxiliary solar water heater.
2. Working principle:
The working principle of the air energy water heater is the "inverse Carnot" principle, that is, the "outdoor unit" compresses air like a pump to raise the air temperature, and then conducts heat to the indoor water storage tank through a liquid that will boil at-17℃, and then releases heat to the water. Simply put, it is to absorb the heat in the air to heat the water temperature, and the absorbed heat air is applied to the kitchen to solve the sultry problem.
Using the working principle of heat pump to heat is contrary to air conditioning refrigeration-the national refrigeration standard is 1000 watt, and the electric refrigeration is 2800 watt. According to the principle of heat balance, at least 2800 watts of heat is generated at the same time, and the actual heat generated is 3000-4000 watts with the input of 1000 watts of electric energy. When the heat is delivered to the insulated water tank, the power consumption is only a quarter of that of the electric water heater (even if the thermal efficiency of the electric water heater is 1 0,000%, the input of 1 0,000 watts of electricity is only 65,438).
Air energy water heaters do not need sunlight, and can be placed at home or outdoors. It is difficult to produce hot water immediately after the water stored in the solar water heater is used up. If the electric heating takes a long time, and the air energy water heater can run under pressure for 24 hours as long as there is air and the temperature is above zero degrees Celsius. In this way, even if a box of water is used up, the air energy water heater will generate another box of hot water in an hour or so. At the same time, it can fundamentally eliminate the potential safety hazards such as electric water heater leakage, dry burning, harmful gas generated when gas water heater is used, overcome the shortcomings of solar water heater that it can not be used in rainy days and is inconvenient to install, and has many advantages such as high safety, high energy saving, long service life and no toxic gas emission. The service life of air energy water heaters can generally reach 15 to 20 years.
What is a heat pump?
What is a heat pump?
Heat pump technology is a new energy technology that has attracted worldwide attention in recent years. The familiar "pump" is a kind of mechanical equipment that can improve potential energy. For example, a water pump mainly pumps water from a low position to a high position. And "heat pump" is a device that can obtain low-grade heat energy from air, water or soil in nature and provide high-grade heat energy for people to use after electric power does work.
Working principle of heat pump
As a natural phenomenon, just as water flows from a high place to a low place, heat always flows from a high temperature area to a low temperature area. But people can create machines, just like lifting water from a low place to a high place and using a pump. Heat pump can be used to pump heat from low temperature to high temperature. Therefore, the heat pump is essentially a heat lifting device. The function of heat pump is to absorb heat from the surrounding environment and transfer it to the heated object (the object with higher temperature). Its working principle is the same as that of the refrigerator, which works according to the inverse Carnot cycle, but the difference is that the working temperature range is different.
When the heat pump is working, it consumes a part of energy, excavates the energy stored in the environmental medium, and uses it by raising the temperature through the heat transfer working medium circulation system, while the work consumed by the whole heat pump device is only a small part of the output work. Therefore, the use of heat pump technology can save a lot of high-grade energy.
In operation, the evaporator absorbs heat from the surrounding environment to evaporate the heat transfer working medium. After the working medium steam is compressed by the compressor, the temperature and pressure rise. When the high-temperature steam condenses into liquid through the condenser, the released heat is transferred to the water in the water storage tank. The condensed heat transfer working medium returns to the evaporator through the expansion valve, and then is evaporated, and so on.
A powerful tool for waste heat utilization-heat pump
Water flows from high to low, and heat is completely transferred from high-temperature objects to low-temperature objects, which is a natural law. However, in real life, in order to meet the needs of agricultural irrigation and domestic water, people use pumps to send water from low places to high places. Similarly, in today's increasingly tense energy sources, in order to recover the heat from the low-temperature hot gas usually discharged into the atmosphere and the low-temperature hot water discharged into rivers, heat pumps are used to transfer the heat energy of low-temperature objects to high-temperature objects, and then the high-temperature objects heat water or heat to make full use of the heat. ?
The working principle of heat pump is basically the same as that of household air conditioner and refrigerator. The heat of the low-temperature object is transferred to the high-temperature object through the circulation of the gas phase change (boiling and condensation) of the flowing medium (previously freon, now replaced by freon) in the evaporator, compressor, condenser and expansion valve. ?
The specific working process is as follows: ① Superheated liquid medium absorbs the heat of low-temperature objects in the evaporator and evaporates into gas medium. ② The gas medium from the evaporator is compressed by the liquid compressor and becomes a gas medium with high temperature and high pressure. (3) The high-temperature and high-pressure gas medium releases heat energy to the high-temperature object in the condenser and becomes a high-pressure liquid medium at the same time. (4) The high-pressure liquid medium is decompressed in the expansion valve, then becomes superheated liquid medium, enters the evaporator, and circulates the initial process. ?
The performance of heat pump is generally evaluated by coefficient of performance (COP). The coefficient of performance is defined as the ratio of heat transferred from low-temperature objects to high-temperature grazing bodies to required power. Usually, the coefficient of performance of a heat pump is about 3-4, that is, the heat pump can transfer 3-4 times the required energy from a low-temperature object to a high-temperature object. Now Europe, America and Japan are all competing to develop new heat pumps. It is reported that the performance coefficient of the new heat pump can reach 6 to 8. If this value can be popularized, it means that energy will be used more effectively. The popularity of heat pumps will also be greatly improved. At present, the maximum output temperature of heat pump is about 1 10 degrees. Exceeding this temperature may lead to the danger of dielectric decomposition.
Because freon has a destructive effect on ozone in the earth's atmosphere, in order to protect the earth's ecological environment, in addition to improving the efficiency of heat pumps and making effective use of energy, scientists all over the world are also committed to developing new refrigeration media. At present, the medium replacing freon has been applied.
What is the difference between an air energy water heater and an air energy heat pump?
Similarly, heat pump water heater and air energy water heater are the same, but they are called differently. Heat pump is a device that transfers heat energy from low-temperature heat source to high-temperature heat source. And it is not only a water heater, but also can replace air conditioning and heating. For example, Changfeng Taihe in China is making a series of products of air energy heat pump.
What is the function of air source heat pump?
The working process of air source heat pump is as follows: the compressor compresses the low-pressure refrigerant that returns and turns it into high-temperature and high-pressure gas to be discharged. The refrigerant gas with high temperature and high pressure flows through the copper tube wound outside the water tank, and the heat is conducted to the water tank through the copper tube. The cooled refrigerant becomes liquid under the continuous action of pressure and enters the evaporator after passing through the expansion valve. Because the pressure of the evaporator suddenly drops, the liquid refrigerant quickly evaporates into gas here, absorbing a lot of heat. At the same time, under the action of the fan, a large amount of air flows through the outer surface of the evaporator, the energy in the air is absorbed by the evaporator, and the air temperature drops rapidly, turning into cold air and being discharged into the kitchen. Then the refrigerant that has absorbed certain energy flows back to the compressor and enters the next cycle.
The characteristics of air source heat pump are: 1, saving money: because its power consumption is only one quarter of that of the same electric water heater, which is equivalent to using the same amount of hot water. Using air source heat pump water heater, the electricity bill is only a quarter of that of electric heating. Based on the calculation of a family of four, the normal hot water consumption is about 200L/ day, and the electric water heater costs about 4 yuan/day, while the air source heat pump water heater only costs about 1 yuan/day, which can save about 1 10,000 yuan a year. 2. Comfort: The air-source heat pump water heater is regenerative, which automatically starts the heating function according to the temperature in the water tank, and the hot water supply is sufficient for 24 hours. Therefore, there will be no problem that multiple faucets can't use hot water at the same time like gas water heaters, and there will be no problem that the capacity of electric water heaters is small and many people need to wait for a bath.
What principle does the air source heat pump follow?
The air source heat pump follows the inverse Carnot principle.
What is the refrigeration principle of air source heat pump?
The core of air source heat pump equipment consists of compressor, condenser, expansion valve and evaporator. The basic working principle and process is that the heat pump unit compresses the recovered low-pressure refrigerant and turns it into high-temperature and high-pressure gas to be discharged. High-temperature and high-pressure refrigerant gas flows through the copper tube wound outside the water tank, and the heat is conducted to the water tank through the copper tube, which can provide high-temperature hot water for heating or floor heating. Then the cooled refrigerant becomes liquid under the continuous action of pressure, and enters the evaporator after passing through the expansion valve. Because of the sudden drop of evaporator pressure, liquid refrigerant quickly evaporates into gas and absorbs a lot of heat. Under the action of the fan, a large amount of air flows through the outer surface of the evaporator, the energy in the air is absorbed by the evaporator, and the temperature of the air drops rapidly, becoming cold air, which is discharged into the fan coil to provide refrigeration service. Then the refrigerant absorbed by the evaporator flows back to the compressor and enters the next cycle. From the above analysis, it is not difficult to see that the working principle of air-source heat pump is similar to that of air-conditioning refrigeration, which uses the inverse Carnot principle to move cold and heat energy, but the difference is that the air-source heat pump has high working efficiency and saves more than 40% energy than air-conditioning. Therefore, air source heat pump is a new type of energy-saving and environmental protection equipment with great development and popularization value, which has practical value.