Integrated air source heat pump system

Abstract

The invention discloses an integrated air source heat pump system. A compressor outlet is connected to a first interface of a four-way reversing valve sequentially through a first electromagnetic valve, a heat accumulator first passage and a fifth electromagnetic valve, a second interface of the four-way reversing valve is connected to a fourth interface of the four-way reversing valve sequentially through an indoor heat exchanger, an expansion valve and an outdoor heat exchanger, and a third interface of the four-way reversing valve is sequentially connected with a second electromagnetic valve, a gas-liquid separator and a compressor inlet; one end of a heat accumulator second passage is connected to an inlet of the gas-liquid separator while the other end of the same is sequentially connected with a capillary pipe, a third electromagnetic valve and the third interface of the four-way reversing valve, the first interface of the four-way reversing valve is sequentially connected with afourth electromagnetic valve, a hot water heat exchanger and an outlet of the heat accumulator first passage, a first bypass valve is connected between the compressor outlet and the outlet of the heat accumulator first passage, and two ends of the expansion valve are connected with second bypass valves. The integrated air source heat pump system can realize heating, refrigerating and hot water supply and can quickly realize defrosting in a heating mode without impact on normal running.

Description

technical field [0001] The invention belongs to the technical field of heat pump systems, and in particular relates to an integrated air source heat pump system. Background technique [0002] When the air source heat pump is running in winter heating mode, the air side heat exchanger (outdoor unit) acts as an evaporator. Due to the low ambient temperature, the temperature on the surface of the heat exchanger also drops, even below 0°C , when the outdoor air flows through the heat exchanger coil, the moisture contained in it will condense out and even form a frost layer. The formation of the frost layer increases the heat conduction resistance, reduces the heat transfer coefficient of the air-side heat exchanger, and reduces the air flow through the air-side heat exchanger. As the frost layer thickens, there will be a drop in evaporation temperature, a drop in heating capacity, and attenuation of fan performance. It will affect the heating efficiency, and in severe cases, i...

AI Technical Summary

Problems solved by technology

However, both of these two defrosting methods have certain defects, which are mainly manifested in: since the energy for defrosting basically comes from the power consumption of the compressor during the defrosting process of high-temperature gas, the heat supply for defrosting is insufficient, It causes drastic changes in the suction and exhaust pressure, and has a large impact on the compressor; the refrigerant in the system returns to a large amount; the general reverse cycle defrosting not only becomes complicated in the control aspect, but also the heat pump system cannot be operated during the defrosting process. Heating will affect normal use, and the frequent switching of evaporators and condensers may seriously damage the normal operation of the unit

At the beginning of defrosting, there is a process of pressure decay, and some systems will stop due to the decay of the low pressure protection value; sometimes the phenomenon of false defrosting will cause the pressure of the condenser to rise suddenly, causing damage to the instrument; the defrosting process will not only fail heating, but also absorbs heat from the heating space, which greatly affects the hot water stored in the tank

Due to insufficient heat supply for defrosting, the defrosting time is prolonged and the loss of defrosting energy consumption is increased

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