Heat-accumulating and dehumidifying coupled frostless air source heat pump water heater

Abstract

The invention discloses a heat-accumulating and dehumidifying coupled frostless air source heat pump water heater. The water heater comprises a compressor, a high-pressure controller, a four-way valve, a water tank, an electromagnetic valve, a heat-accumulating device, an electronic expansion valve, a drying filter, a heat exchanger, an evaporator and a low-pressure controller, and is characterized in that on one hand, residual heat generated at normal times during efficient running of a heat pump is transferred into the heat-accumulating device by using a system, and is taken as a low-temperature thermal resource under the regeneration working condition of the heat pump, so that the problem of insufficient energy source during hot air defrosting of the conventional heat pump is solved effectively; and on the other hand, treated outdoor air is dried and dehumidified firstly by using the heat exchanger of which the fin surfaces are coated with a solid dehumidifying adsorbent in the system, and the dew-point temperature of dehumidified air is lower than the evaporating temperature of a refrigerant in the evaporator, so that a frostless air source thermal pump is realized. When the dehumidifying capability of the solid dehumidifying adsorbent is weakened, the system is switched into a regenerating mode. Due to the adoption of the heat-accumulating and dehumidifying coupled frostless air source heat pump water heater, frost can be delayed and even eliminated, defrosting energy consumption is lowered, the exhaust temperature of the compressor is lowered, and the low-temperature adaptability of the water heater is improved.

Description

technical field [0001] The invention belongs to the field of refrigeration equipment, in particular to a frost-free air source heat pump water heater coupled with heat storage and dehumidification. Background technique [0002] The air source heat pump has the advantages of both cooling and heating, small space occupation, energy saving, environmental protection, and convenience, and is favored by more and more people. However, frost sometimes forms on the outdoor finned tube heat exchanger during heating operation in winter. On the one hand, the frost layer will increase the thermal resistance between the humid air and the surface of the fins, reducing the heat transfer coefficient of the evaporator. On the other hand, the existence of the frost layer increases the resistance of the air flowing through the finned tube evaporator and reduces the air flow. When the air source heat pump is operating under frosting conditions, as the frost layer thickens, the heating performan...

AI Technical Summary

Problems solved by technology

However, in the analysis mode, when the evaporation temperature is lower than 0°C, the system still has the problem of frosting, which affects the low temperature adaptability of the air source heat pump.

[0004] Throughout the research status at home and abroad, people have greatly improved the defrosting of air source heat pumps, but the performance of conventional defrosting in actual operation is still unsatisfactory, and the stability and reliability of the defrosting process are far from being resolved.

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