Ultra-high temperature cascade water source heat pump system

Abstract

The invention discloses an ultra-high temperature cascade water source heat pump system. The ultra-high temperature cascade water source heat pump system comprises an intermediate heat exchanger, a low temperature stage unit and a high temperature stage unit, wherein the low temperature stage unit comprises a first-stage compressor, a first-stage electronic expansion valve and an evaporator; the high temperature stage unit comprises a second-stage compressor, a condenser and a second-stage electronic expansion valve; the intermediate heat exchanger serves as a first-stage condenser in a low temperature side refrigerating circuit and also serves as a second-stage evaporator in a high temperature side heating circuit. In the ultra-high temperature cascade water source heat pump system, the heat transfer enhancement effect in the tube of a refrigerating fluid is good, the heat transfer temperature difference of the intermediate heat exchanger is stable, the system energy efficiency is improved, high temperature hot water and cold water are produced at the same time, and the water temperature and quantity of heat can also be guaranteed.

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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