A transcritical co2 heat pump heating system with fast defrost function

Abstract

The invention discloses a transcritical CO2 heat pump heating system with fast defrosting function, comprising a first evaporator, a first compressor, a first condenser, a first expansion valve, an evaporative condenser, a second compressor, a gas Cooler and second expansion valve; two sets of independent heat pump systems are used, and the low-temperature return water from the radiator is heated by the transcritical CO2 heat pump system to heat the heat storage temperature of the radiator; the invention adjusts the gas cooler in the transcritical CO2 heat pump The inlet water temperature ensures that the heat pump system operates at the maximum heating energy efficiency ratio; the present invention adopts an evaporative condenser and sets four solenoid valves, and by adjusting the opening / closing of the solenoid valves, the system flow is changed to realize the rapid removal of the transcritical CO2 heat pump heating system. At the same time, it can effectively heat the heating return water without adversely affecting the heating users, and improves the energy efficiency ratio of the transcritical CO2 heat pump heating system at low ambient temperature.

Description

【Technical field】 [0001] The invention belongs to the technical field of heat pumps, and relates to a transcritical CO pump with a fast defrosting function. 2 Heat pump heating system. 【Background technique】 [0002] Heat pump technology is a means of transferring low-level energy to high-level energy by consuming certain high-level energy, such as mechanical energy and electrical energy, and through a thermal cycle. The current heat pump technology is mainly based on mechanical compression, and the main components include compressors, condensers, expansion valves and evaporators. Heat pumps can be divided into air source heat pumps, water source heat pumps, and ground source heat pumps according to different low-temperature heat sources. Air source heat pumps use outdoor air as a heat source for heating or hot water supply. The energy-saving effect is obviously higher than that of heating methods such as electric heating. However, due to the operation of the air source h...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of transcritical CO with fast defrosting function 2 Heat pump heating system to solve the existing heating heat pump system using CO 2 Working fluid problems exist when making transcritical CO 2 The heat pump system can be efficiently and stably applied to heating in the form of radiators at extremely low ambient temperatures, and at the same time solves the problem of transcritical CO 2 Frosting of heat pump systems operating at very low ambient temperatures provides a quick defrosting method

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