A super high temperature cascade water source heat pump system

Abstract

The invention discloses an ultra-high temperature cascade water source heat pump system, which includes an intermediate heat exchanger, a low-temperature unit and a high-temperature unit. The low-temperature unit includes a first-stage compressor, a first-stage electronic expansion valve, and an evaporator. The first-stage unit includes a second-stage compressor, a condenser, and a second-stage electronic expansion valve. The intermediate heat exchanger is used as the first-stage condenser of the low-temperature side refrigeration circuit and as the second evaporator of the high-temperature side heating circuit. In the present invention, the enhanced heat transfer effect in the refrigerant tube is good, the heat transfer temperature difference of the intermediate heat exchanger is stable, the energy efficiency of the system is improved, and the water temperature and heat can be guaranteed when high-temperature hot water and cold water are produced simultaneously.

Description

technical field [0001] The invention relates to an ultra-high temperature cascade water source heat pump system. The water source heat pump is suitable for the low temperature side and the high temperature side in the field of refrigeration and air conditioning. Background technique [0002] The water source heat pump is an air conditioning technology that uses the solar energy stored in the earth's water as a cold and heat source for conversion. The working principle of water source heat pump technology is: through the input of a small amount of high-grade energy (such as electric energy), the heat energy of the low-temperature position is transferred to the high-temperature position. The water body is used as the heat source of the heat pump heating in winter and the cold source of the air conditioner in summer, that is, the heat in the building is "taken" in summer and released into the water body. Because the temperature of the water source is low, it can efficiently tak...

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Problems solved by technology

[0003] The water temperature produced by the existing water source heat pump unit is relatively low. When producing high-temperature hot water, the energy efficiency is greatly reduced compared with the cooling operation. When producing high-temperature hot water and cold water at the same time, the water temperature and heat are affected by the compressor and the system. extremely restrictive

The intermediate heat exchange of the current water source heat pump unit adopts the form of direct heat exchange between the refrigerants on both sides. The enhanced heat exchange effect in the refrigerant pipe is poor, which will lead to a large heat transfer temperature difference in the intermediate heat exchanger and poor energy efficiency of the system.

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