Solar energy-air energy compound evaporator, control method and heat pump water heater

Abstract

The invention discloses a solar-air energy composite evaporator and a control method thereof. The evaporator includes a shell surrounded by a bottom surface and a surrounding frame, and a heat-absorbing pipe. A refrigerant circulates in the heat-absorbing pipe, and an energy-saving device is arranged on the top of the shell. A light-transmitting and reflective cover plate, one side of the cover plate is connected to one of the frames of the housing through a rotating shaft, and is used to open or close the top opening of the housing. The bottom of the tube is arranged in contact with the heat absorbing tube, and the surface of the heat absorbing tube and / or the upper surface of the heat collecting plate is provided with a light-absorbing coating. The invention sets a rotatable cover plate, and judges the solar radiation intensity according to the difference between the ambient temperature and the refrigerant evaporation temperature, and then controls the position of the cover plate, thereby realizing that no matter what the environmental conditions are, the inside of the heat-absorbing tube The heat exchange efficiency of the refrigerant, ambient air and solar energy can reach the highest, which can greatly increase the evaporation temperature of the refrigerant and improve the energy efficiency ratio of the heat pump.

Description

technical field [0001] The invention relates to an evaporator, in particular to a solar-air energy composite evaporator. Background technique [0002] Air source heat pumps have poor heating effect and low energy efficiency when the ambient temperature is low, and the system cannot run stably. Usually, an auxiliary heat source is introduced to solve this problem. Among them, solar energy has become the auxiliary air source because of its high energy quality, energy saving and environmental protection. A heat pump is a great option. At present, the combination of solar energy and air energy is mainly two heat pump systems, direct expansion and non-direct expansion. The non-direct expansion mainly adds a solar collector, which can be connected in series, parallel or mixed with the air evaporator. In this way, the increased initial investment is relatively large, and it is mainly used for large and medium-sized systems, while the direct expansion type uses solar energy and air...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of poor heat collection effect of the evaporator of the existing direct expansion solar heat pump when the ambient temperature is low, the solar irradiance is normal or not, resulting in poor heating effect of the heat pump, low energy efficiency and serious heat dissipation of the evaporator when the solar irradiance is strong. Technical problems, a solar-air energy composite evaporator is proposed, which can solve the above problems

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