Ultra-wide environment temperature air source heat pump system and control method

Abstract

The invention discloses an ultra-wide environment temperature air source heat pump system, and relates to the technical field of air source heat pump units. The ultra-wide environment temperature air source heat pump system comprises a refrigeration circulation system and a heating circulation system, the refrigeration circulation system comprises a four-way reversing valve D port connected with an exhaust port of a compressor; and a four-way reversing valve C port is sequentially communicated with a finned heat exchanger, a first filter, a refrigerant self-balancer and the first end of a bridge type one-way valve set, and the fourth end of the bridge type one-way valve set is sequentially communicated with a heat regeneration energy saver, an economizer, a second filter, a main path electronic expansion valve and the second end of the bridge type one-way valve set, and then a four-way reversing valve E port is connected through the third end of the bridge type one-way valve set and a shell and tube heat exchanger, and then the heat regeneration energy saver, a gas-liquid separator, and the compressor are sequentially connected through a four-way reversing valve S port to forms a circulation loop. According to the ultra-wide environment temperature air source heat pump system, high-water-outlet-temperature heating at the ultralow environment temperature and low-water-outlet-temperature refrigerating at the high environment temperature can be achieved, the system is a single-machine single-stage compression refrigerant system, the manufacturing cost is low, and materials are saved.

Description

technical field [0001] The invention relates to the technical field of air source heat pump units, in particular to an ultra-wide ambient temperature air source heat pump system and a control method. Background technique [0002] Existing air source heat pump cold (hot) water unit systems are mostly single-unit single-stage compressed refrigerant systems. Although cold and hot can be provided simultaneously, they are limited by the ambient temperature conditions in the area of ​​use; when the ambient temperature conditions are high or low At this time, the capacity of the unit is attenuated greatly, the energy efficiency is low, the system has problems such as insufficient air return of the compressor, high discharge temperature, excessive compression ratio, liquid in the return air of the compressor, and poor oil return effect, etc., resulting in the unit not working normally. Especially when heating at a low ambient temperature below -25°C, the unit cannot even work, and t...

AI Technical Summary

Problems solved by technology

[0002] Existing air source heat pump cold (hot) water unit systems are mostly single-unit single-stage compressed refrigerant systems. Although cold and hot can be provided simultaneously, they are limited by the ambient temperature conditions in the area of ​​use; when the ambient temperature conditions are high or low When the capacity of the unit is attenuated greatly, the energy efficiency is low, the system has problems such as insufficient air return of the compressor, high discharge temperature, excessive compression ratio, liquid in the return air of the compressor, and poor oil return effect, etc., resulting in the unit not working normally

Especially when heating at a low ambient temperature below -25°C, the unit cannot even work, and the scope of application is obviously limited

Some air source heat pump systems focus on heating in terms of system and structural design. Although they meet the heating application at a lower ambient temperature (-30°C), they sacrifice a lot of cooling capacity and cannot even operate in cooling.

The air source heat pump hot water unit system only provides hot water and can be used for heating in winter, but it cannot provide cooling services and cannot meet the needs of both cooling and heating, and the scope of application is also limited

There are also dual-machine, two-stage compression refrigerant systems and cascade refrigerant systems. Although they can meet the low ambient temperature operation, the cost is high and the material saving is poor.

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