Direct-expansion solar heat pump water heating system

Abstract

The invention discloses a heat absorption core of a collector used for a solar heat pump water heating system, a naked plate type collector, a collector with a glass cover plate as well as a direct-expansion solar heat pump water heating system. The naked plate type collector and collector with the glass cover plate are connected through an electromagnetic valve and a refrigerant copper pipe and, a PLC (Programmable Logic Controller) controls the open and close of the electromagnetic valve according to different external conditions so as to realize the separated operation and series operation of the naked plate type collector and the collector with the glass cover plate. Refrigerant gas through evaporation and compression enters a plate-type heat exchanger so as to carry out countercurrent flow heat exchange with circulating water, hot water temperature is fed back to a controller through a temperature sensor, and the controller controls the open and stop of a compressor. With the structure, the system has the advantages of high energy efficiency ratio, good environmental adaptation, simple structure and the like and is environment-friendly and energy-saving.

Description

technical field [0001] The invention relates to a solar water heating device, in particular to a direct expansion solar heat pump water heating system, which belongs to the technical field of heating, air conditioning and domestic hot water equipment. Background technique [0002] As the largest renewable energy source on earth, solar energy has gained more utilization and development in recent years. The direct expansion solar heat pump system (DX-SAHP) uses the solar collector plate as the evaporator of the heat pump system. The refrigerant is filled into the heat collector plate and absorbs solar energy and heat from the surrounding environment when it flows through the heat collector / evaporator. The heat of condensation is then transferred to the heated substance via a heat pump cycle. Compared with the non-direct expansion solar heat pump, the direct expansion solar heat pump saves the heat exchange equipment between the heat collection cycle and the heat pump cycle in...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the surface of the submerged condenser heat exchanger is easy to be corroded, it is inconvenient to install and clean, and the heat exchange efficiency is not high. At the same time, the connecting pipeline is long, and if the refrigerant leaks, it will pollute the water quality; the evaporator is a series type. There is uneven distribution of refrigerant during operation, and the energy is not fully utilized. The refrigerant will produce a pressure drop during the flow process. At the same time, the heat collection area cannot be controlled in real time according to changes in the external environment, which affects system performance.

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