Air source heat pump principle

In the past two years, air-source heat pump can be said that the fire all over the north and south, but feel free to ask a few people to ask the basic principles of air-source heat pump, people know little! However, if you study the following carefully, you can fully understand the fundamentals of air source heat pumps.


A heat pump is a device that draws low heat energy from the air, water or soil of nature, produces energy through the electrical energy, and provides high thermal energy that can be used by people. Learning the principle of heat pump, have to say is the first law of thermodynamics and the second law of thermodynamics:

Conservation of energy       △U = Q+W, 

Irreversibility of heat transfer   η= 1 - Q2/Q1   

The four major components of the air source heat pump are compressor, condenser, throttling device and evaporator. Low-pressure gaseous refrigerant into the compressor, and then compressed into a high temperature and pressure of gas, then the boiling point of the working fluid increases with the pressure rise, the high-boiling point of the refrigerant into the condenser began to liquefy, the refrigerant heat, loss of heat Working fluid into a liquid, and then into the throttling device into the evaporator, throttling device and then make the working pressure, reduced pressure after the working fluid in the evaporator began to evaporate, then the working fluid and absorb heat, and Into low-pressure gas, and then into the compressor, the refrigerant has been so cycle, this is the principle of heat pump cycle. Heat pump cycle mainly has the following four steps:

Compression - isentropic process: low temperature and pressure - compression - high temperature and pressure gas

Condensation - isobaric process: high temperature and pressure gas -- exothermic -- medium temperature and high pressure liquid

Throttling - isenthalpic process: medium temperature and high pressure liquid -- throttling -- low temperature and low pressure gas and liquid mixture

Evaporation - isobaric process: low temperature and pressure gas --liquid mixture -- endothermic -- low temperature and pressure gas


According to the heat source side of the system and the use of the media to determine the main heat pump can be divided into four categories: air-cooled hot and cold water units, water-cooled hot and cold water units, air-cooled hot and cold air units, water-cooled hot and cold air units.

In short, the heat pump with anti-Carnot principle, with a very small amount of electricity, by absorbing a lot of low-temperature heat in the air through the compressor compression into high-temperature heat, thus heating hot water, with low energy consumption, high efficiency, speed fast, safe, environmental protection, and energy supply of hot water and many other advantages!