Single-evaporator-type solar energy and air source combined heat pump and running method thereof

Abstract

The invention discloses a single-evaporator-type solar energy and air source combined heat pump and a running method thereof. The single-evaporator-type solar energy and air source combined heat pump comprises a heat-collection evaporator, a compressor, a condenser and a throttling valve, a three-way valve is arranged on a pipeline among an outlet of the compressor, an outlet of the heat-collection evaporator and an inlet of the condenser, and a valve is parallelly connected at two ends of the throttling valve. The heat-collection evaporator comprises a heat collection plate, a refrigerant pipeline, a glass cover plate, a heat insulating material, a fan and a surrounding face, the glass cover plate is arranged on the upper portions of the refrigerant pipeline and the heat collection plate, the heat insulating material is arranged at the bottoms of the refrigerant pipeline and the heat collection plate, and the glass cover plate, the heat insulating material and front and rear side faces surround to form an air passage. A solar heat collector and an air-cooling evaporator are organically combined, so that initial investment of a heating system is effectively lowered, and utilization efficiency and utilization level of solar energy different in radiation intensity and air heat energy different in temperature grade are improved. According to sun radiation conditions and outdoor air temperature, the heat pump can reasonably switch among multiple running modes to finally realize high-efficiency heat supply 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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