A dual temperature heat source heat pump system

Abstract

The invention discloses a dual-temperature heat source heat pump system, which includes a compressor, a gas-liquid separator and a four-way valve connected through pipelines. The four-way valve is connected with two sets of heat exchanger pipelines, and the first set of heat exchange The water source heat exchanger and the exhaust air heat exchanger are connected in parallel. The water source heat exchanger exchanges heat with the liquid medium, and the exhaust air heat exchanger exchanges heat with the air medium. The second set of heat exchanger pipelines includes air The processing heat exchanger, the water source heat exchanger and the exhaust air heat exchanger are connected in series with the expansion valve for heating and the check valve for cooling in parallel, and the air treatment heat exchanger is connected in series with the expansion valve for cooling and the expansion valve for heating in parallel. one-way valve. Because the heat pump system of the present invention adopts dual heat sources, it can reduce the heat transfer temperature difference and compression ratio of the heat pump, and improve energy efficiency.

Description

technical field [0001] The invention relates to a heat pump air conditioning system, which can be used for building heating, air conditioning, ventilation and the like. Background technique [0002] A heat pump is a heat engine that works in a reverse cycle. It only needs to input a small amount of high-grade energy to absorb heat from a low-temperature environment and release several times the heat to a high-temperature environment. It has cooling and heating functions and has been widely used in house heating and air conditioning. etc., is an efficient heating device. The cooling and dehumidification process of the air is coupled during the cooling of the air conditioner in the current heat pump, and the cooling and dehumidification of the air are realized by a single-temperature cold source through cooling, which makes the heat transfer temperature difference between the heat pump working medium and the environmental medium large, and the heat pump is high. 1. The pressu...

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Problems solved by technology

The cooling and dehumidification process of the air is coupled during the cooling of the air conditioner in the current heat pump, and the cooling and dehumidification of the air are realized by a single-temperature cold source through cooling, which makes the heat transfer temperature difference between the heat pump working medium and the environmental medium large, and the heat pump is high. 1. The pressure difference between the low-temperature heat sources is high, which affects the energy efficiency of the heat pump; secondly, the current heat pump technology cannot realize the recovery of exhaust air energy and condensate cooling capacity; the invention patent ZL200410054061.2 proposes a semi-cascade heat pump for cooling The heating system can realize independent control of temperature and humidity, independent treatment of heat and humidity, and improve the adaptability of the heat pump system to the environment

However, the second-stage heat pump unit in this invention uses a series evaporator / condenser, which is not conducive to the uniform distribution of refrigerant, and the air treatment process is still a conventional cooling and dehumidification coupling process, and the efficiency is still not high.

Invention patent ZL200510029140.2 proposes a heat pump air-conditioning system with solution absorption and drying function, which can achieve high-efficiency dehumidification, but the solution dehumidification equipment is large in size, the system process is long and complicated, and the solution is corrosive, which has high requirements for equipment and other shortcomings. The actual effect of its engineering application

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