A single evaporator solar air source compound heat pump and its operation method

Abstract

A single evaporator type solar air source composite heat pump and its operation method, including a collector-evaporator, a compressor, a condenser and a throttle valve; between the outlet of the compressor, the outlet of the collector-evaporator and the inlet of the condenser A three-way valve is set on the pipeline, and a valve is connected in parallel at both ends of the throttle valve. Heat collector-evaporator includes heat collector plate, refrigerant pipe, glass cover plate, insulation material, fan and enclosure surface; the upper part of refrigerant pipe and heat collector plate is provided with glass cover plate, and the bottom is provided with heat preservation material; glass cover plate, The thermal insulation material and the front and rear sides surround the synthetic air channel. The invention organically combines the solar heat collector and the air-cooled evaporator, effectively reduces the initial investment of the heating system, and improves the utilization efficiency and utilization degree of solar energy with different radiation intensities and air heat energy with different temperature grades. According to solar radiation conditions and outdoor air temperature, it can reasonably switch between various operating modes, and finally realize efficient heating and domestic hot water supply.

Description

Background technique [0001] Global building heating and domestic hot water consume a lot of energy. The high living standards and living habits of developed countries have caused huge demand for hot water and energy consumption, while developing countries are increasing with the development of urbanization and the improvement of living standards. Will maintain the rapid growth of hot water energy consumption. The commonly used heating system in my country mainly uses fossil fuel combustion, which is not only inefficient but also seriously polluting; while the domestic hot water system mainly uses gas water heaters and electric water heaters, which have problems of high energy consumption and waste of energy grade. Heating and domestic hot water have increasingly become one of the key areas of concern for energy conservation, emission reduction, and smog control. [0002] In recent years, solar water heaters and air source heat pump water heaters have been greatly developed. ...

AI Technical Summary

Problems solved by technology

Compared with traditional solar water heaters, this kind of scheme makes full use of the weaker solar radiation to a certain extent, but it still cannot heat when there is no solar radiation at night, and it cannot use air heat energy, and it does not solve the problem of heating when there is no solar energy. problem; and when the solar radiation is weak, in order to meet the requirements of heating capacity, it is necessary to use a larger solar collector, which makes the cost higher; (2) using a direct expansion solar collector and an air-cooled evaporator The evaporator is used as a heat pump evaporator. When the solar radiation is strong, the solar energy can be used for direct heating, and the air source heat pump mode can be operated under the condition of no sun or weak radiation (such as patent CN201120054202.6)

This kind of scheme can use solar energy or air heat energy, but the heat pump system needs to use two evaporators, the cost is too high, the system is complicated, and this kind of scheme can not realize the direct heating of air heat energy and the combination of solar energy and air heat energy. combined heating

[0004] It is worth noting that when the temperature of hot water required in some cases is low or the external temperature is high (for example: when the external temperature is 30°C in summer, low-temperature hot water of 10-20°C is prepared for cross-seasonal air heat energy storage), the external air heat energy can also be directly heated, but currently it is realized through the air source heat pump, resulting in high energy consumption for heating

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