A two-stage high temperature condensation heat recovery heat pump system

Abstract

A two-stage high-temperature condensation heat recovery heat pump system, the system includes a low-pressure compressor (1), a four-way valve (2), an indoor heat exchanger (3), an outdoor heat exchanger (4), and a high-pressure compressor (5) , high-temperature water heater (6), gas-liquid separator (7). The heat pump system can meet different needs under various working conditions. The high-temperature condensation heat recovered in summer can meet the requirements of heating temperature and heating capacity, and the recovery volume can be adjusted from 0 to 100; Separately produce high and low temperature domestic hot water; in winter, it can solve the heat supply and demand contradiction of air source heat pump heating and ensure the demand for high temperature domestic hot water.

Description

technical field [0001] The invention relates to a condensation heat recovery heat pump of an air-conditioning system, in particular to a two-stage high-temperature condensation heat recovery heat pump system, which belongs to the fields of building air conditioning and heating energy utilization. Background technique [0002] The existing condensation heat recovery system mainly includes: a heat pump air conditioner under three modes of total condensation heat recovery, partial condensation heat recovery and composite condensation heat recovery with a heat exchanger installed on the compressor exhaust pipe in front of the outdoor condenser; Two-stage compression refrigerating heat pump cycle, a heat pump system that realizes combined cooling and heating through two-stage compression, can recover all the condensation heat in summer, and can meet the demand for heating capacity and heating temperature in winter, but it is only applicable when the heat supply in summer is greate...

AI Technical Summary

Problems solved by technology

However, this condensation heat recovery method is limited by the cooling capacity, and the heat recovery capacity is limited, only about 25% of the condensation heat, and the temperature for preparing hot water is also low

[0004] And the heat pump system that supplies cooling and heating at the same time, whether it is a refrigeration heat pump system in the form of single-stage compression, cascade or intercooling two-stage compression, when these heat pump systems recover the heat of condensation, due to these refrigeration heat pumps The heating capacity of the system is greater than its cooling capacity, which limits its application to occasions where the heat supply is greater than the cooling capacity in summer, and the heat recovery is limited by the cooling capacity, so the adjustability is poor

These heat pump systems do not have the ability to produce hot water during transitional seasons when there is no cooling demand

[0005] In addition, although the cascade refrigeration system has the advantages of low pressure ratio and high volumetric efficiency, due to the use of non-azeotropic mixed refrigerants and complex heat exchangers, the exhaust pressure of the compressor is high.

Due to the large temperature difference between cold and hot of the condensing evaporator, the irreversible loss of the system is relatively large

As mentioned above, since the heating capacity of these systems is greater than the cooling capacity of the unit and the adjustment of heating capacity is poor, the scope of use of these systems is limited.

Images