Combined heating device of water source heat pump unit

Abstract

The invention relates to a combined heating device of a water source heat pump unit, which comprises an upstream heat pump and a downstream heat pump, wherein the upstream heat pump comprises the shell body of the upstream heat pump, an upstream evaporator, an upstream condenser, an upstream expansion valve and an upstream compressor; the downstream heat pump comprises the shell body of the downstream heat pump, a downstream evaporator, a downstream condenser, a downstream expansion valve and a downstream compressor; the condensing outlet of the upstream condenser of the upstream heat pump is connected with the evaporating inlet of the downstream evaporator through a pipeline; the condensing inlet of the upstream condenser is connected with the evaporating outlet of the downstream condenser through the pipeline; a circulating pump is arranged on the pipeline between the upstream condenser and the downstream evaporator; the upstream condenser, the downstream evaporator, the pipeline between the upstream condenser and the downstream evaporator and the circulating pump form a circulating loop; and a temperature and flow balancing device is arranged between the upstream condenser and the downstream evaporator. The combined heating device can promote the user water supply with the higher temperature by utilizing the water of the water source with the lower temperature during the course of heating.

Description

technical field [0001] The invention belongs to the technical field of heating by heat pump units, and in particular relates to a combined heating device for water source heat pump units. Background technique [0002] A heat pump is a device that transfers energy from a low-temperature heat source to a high-temperature heat source. During operation, the evaporator absorbs heat from the surrounding environment to evaporate the heat-transfer working fluid. The temperature and pressure of the working fluid vapor are increased after being compressed by the compressor. When the high-temperature steam condenses into liquid through the condenser, the heat released is transferred to the condenser. Water, the condensed heat transfer working fluid returns to the evaporator through the expansion valve, and then is evaporated, and so on. [0003] The traditional water source heat pump absorbs the heat in the source water, the temperature of the source water drops, and the temperature o...

AI Technical Summary

Problems solved by technology

[0005] (2) When the water source water temperature is low, the operating efficiency of the unit is not high

Due to the limited lifting capacity of the heat pump unit, when the water source water temperature is lower than the design temperature, the user’s water supply temperature drops, and the heat pump unit automatically increases the load to increase the water supply temperature, and the unit’s operating efficiency becomes lower.

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