Solar hot water efficient defrosting device

Abstract

The invention discloses an efficient defrosting device for solar hot water. The efficient defrosting device for the solar hot water comprises a solar thermal collector, a circulating pump, a heat accumulation water tank, a water pipe, defrosting heat exchange pipes, an evaporation coil pipe, hydrodynamic pistons, a double-shaft crank shaft and a fan; a plurality of defrosting heat exchange pipes are arranged on the front side of the evaporation coil pipe; the fan is arranged on the rear side of the evaporation coil pipe; upper ends of the defrosting heat exchange pipes are communicated with the bottom of the inner chamber of the heat accumulation water tank through the water pipe; the lower ends of the defrosting heat exchange pipes are closed; the hydrodynamic pistons are installed inside the defrosting heat exchange pipes; the lower portions of the hydrodynamic pistons are fixedly connected with the double-shaft crank shaft; the double-shaft crank shaft drives the hydrodynamic pistons to vertically move inside the defrosting heat exchange pipes. The efficient defrosting device for the solar hot water has the advantages of achieving efficient, rapid and energy saving defrosting, enabling a unit to have a heating function during defrosting and accordingly guaranteeing comfort of the indoor environment.

Description

【Technical field】 [0001] The invention relates to a defrosting device for a solar hot water air-cooled heat pump unit. 【Background technique】 [0002] In winter, when the heat pump air conditioner is in heating operation, if the surface temperature of the evaporating coil of the cooling air is lower than the dew point temperature of the cooled air, the water vapor in the air undergoes a phase change process from steam to solid, making Water vapor accumulates on the surface of the heat exchanger as a relatively loose layer of ice crystals to form a frost layer. As the frost layer thickens, the additional significant thermal resistance of the heat exchanger increases, and the air circulation area of ​​the heat exchanger becomes narrower, the air flow decreases, the wind resistance increases, and the power of the fan increases. Thermal capacity gradually decreases. Regular defrosting is a necessary step to ensure the normal operation of the air-cooled heat pump unit. [0003...

AI Technical Summary

Problems solved by technology

[0004] 1. From the perspective of human comfort, heat should be absorbed from the room during defrosting, and the indoor temperature will drop by 5°C to 6°C, affecting indoor comfort

[0005] 2. When switching between heating and defrosting modes, the system pressure fluctuates violently, resulting in relatively large mechanical shocks

[0007] 4. Reverse defrosting In order to avoid the above situation, the compressor is often stopped for about 5 minutes before the defrosting starts, and then stopped for another 5 minutes after the defrosting is completed. Although this avoids pressure fluctuations, it also shortens the heating time and increases the temperature. In addition to water temperature fluctuations, the compressor needs to be started frequently, which affects the life of the compressor

[0008] The above-mentioned shortcomings have negatively affected the comfort of the indoor environment and the reliability of the equipment to a greater extent

Images