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Question：What is air source heat pump

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An air source heat pump (ASHP) is a system which transfers heat from outside to inside a building, or vice versa. Under the principles of vapor compression refrigeration, an ASHP uses a refrigerant system involving a compressor and a condenser to absorb heat at one place and release it at another. They can be used as a space heater or cooler, and are sometimes called "reverse-cycle air conditioners".

 

Question：What about domestic ASHP

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In domestic heating use, an ASHP absorbs heat from outside air and releases it inside the building, as hot air, hot water-filled radiators, underfloor heating and/or domestic hot water supply. The same system can often do the reverse in summer, cooling the inside of the house. When correctly specified, an ASHP can offer a full central heating solution and domestic hot water up to 80°C.

 

Question：What is ASHP technology?

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Heating and cooling is accomplished by pumping a  refrigerant  through the heat pump's indoor and outdoor coils. Like in a refrigerator, a compressor,condenser,expansion valve and evaporator  are used to change states of the refrigerant between colder liquid  and hotter gas states.

When the liquid refrigerant at a low temperature   and low pressure passes through the outdoor heat exchanger coils, ambient heat causes the liquid to boil (change to gas or  vapor ): heat energy from the outside air has been absorbed and stored in the refrigerant as latent heat  . The gas is then compressed using an electric pump; the compression increases the temperature of the gas.

Inside the building, the gas passes through a pressure valve  into heat exchanger coils. There, the hot refrigerant gas condenses back to a liquid and transfers the stored latent heat   to the indoor air, water heating or hot water system. The indoor air or heating water is pumped across the heat exchanger by an electric pump or fan.

The cool liquid refrigerant then re-enter the outdoor heat exchanger coils to begin a new cycle.

Most heat pumps can also operate in a cooling mode where the cold refrigerant is moved through the indoor coils to cool the room air.