What are the types of cascade air source heat pump

In recent years, with the change in energy structure, the proportion of clean energy generation increases year by year. Air source heat pump technology uses air heat energy to achieve heat supply. Air heat energy is the heat energy stored in the atmosphere. Air heat energy comes from solar energy and meets the international definition of renewable energy. An air-source heat pump system is a heating and air-conditioning system composed of an air-source heat pump unit, transmission, distribution system, and building system. The system can be both cooling and heating, common is the household split body heat pump type air conditioner, winter heating, and summer cooling. Below we introduce the types of cascade air source heat pumps.

• Concrete type

• Technological development

Concrete type

Air source heat pump units are divided into two categories, air-cooled heat pump units, and low ambient temperature air source heat pump units, their biggest difference is the difference in the use of ambient temperature. The nominal heating condition of the air-cooled heat pump unit is 7℃, and the ambient temperature under the working condition is -7~43℃. The low ambient temperature air source heat pump heating nominal condition is -12℃, and the working state of the ambient temperature is -25~43℃, it is obvious that they deal with the low-temperature environment "ability" is different, in turn, their refrigeration "ability" is different.

Technological development

Air-cooled heat pumps and a variety of unit air conditioning units, the formation of now we commonly used "all-in-one", such as air-cooled multi-link heat pump units, air duct supply heat pump units, computer and data processing room unit type constant temperature and humidity air conditioner, as well as roof type direct expansion air conditioning units. In the past, because the heating effect of air cooled heat pump in winter is affected by the ambient temperature, although it can be used in both winter and summer when the ambient temperature is below 0℃, the heat attenuation is larger, lower than the nominal heat, limiting the use of this air conditioning mode. In recent years, with technological innovation, especially the application of jet enthalpy technology in low ambient temperature air source heat pump units, based on the four core components of traditional air conditioning, an intermediate economizer or flash evaporator is added to give "jet enthalpy". The compressor provides low temperature and low-pressure refrigerant "air injection", winter heating effect has been significantly improved, the normal working condition is as low as -12℃. This allows air source heat pump systems to be widely used in civil and industrial projects in severe and cold regions.

In short, low ambient temperature air source heat pumps (cryogenic heat pumps for short) are suitable for low ambient temperature scenarios, and air-cooled heat pumps are suitable for room temperature scenarios. When selecting a cascade air source heat pump, select the most suitable equipment according to the requirements and type of air conditioning system.

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