Novel solar air source heat pump system and hot water production method

Abstract

The invention relates to a novel solar air source heat pump system and a hot water production method. The system comprises an air source heat pump system which comprises a heating heat pump evaporator, the heating heat pump evaporator is a finned pipe type heat exchanger which comprises an evaporation working medium return pipe, a solar thermal medium return pipe and a plurality of heat exchange fins arranged in sequence, each heat exchange fin comprises a main radiation face, and the main radiation faces of each two adjacent heat exchange fins are opposite. The evaporation working medium return pipe and the solar thermal medium return pipe are in parallel and both penetrate through the heat exchange fins, and the thermal medium in the solar thermal medium return pipe exchanges heat with the evaporation working medium return pipe through the heat exchange fins. Solar energy can be fully used by means of the novel solar air source heat pump system, and efficiency of an air source heat pump is greatly improved.

Description

technical field [0001] The invention relates to building heating technology, in particular to a heat pump system combining solar energy and air energy and a hot water preparation method. Background technique [0002] Existing solar heat collection systems: relatively high efficiency, low cost, and mature technology. Disadvantages: The temperature of heat collection in cold regions is low in winter, and the temperature of hot water in most weathers is lower than 45 degrees. Electric auxiliary heating is required for bathing and heating. The water temperature for the best heat collection efficiency of the solar heat collection system is generally within the range of not higher than the ambient temperature of about 30 degrees. As the water temperature rises, the solar heat collection efficiency and the heat dissipation loss of the system pipeline will increase. [0003] Existing air source heat pumps: air source heat pumps can be used for heating and cooling, and are highly e...

AI Technical Summary

Problems solved by technology

Disadvantages: In cold areas, the temperature of heat collection is low in winter, and the temperature of hot water in most weathers is lower than 45 degrees. Electric auxiliary heating is required for bathing and heating

Parallel operation means that the temperature of the water supplied by the heat pump decreases after being utilized by the user, and then enters the heat pump return port after passing through the solar collector. Therefore, when the return water temperature of the system is high, after the hot water enters the solar collector, the collector's The efficiency will be very low and may even become a radiator. This kind of system can't effectively use solar energy most of the time in winter, and it is not energy-saving

The air preheating method is to install a heat exchanger outside the evaporator of the air source heat pump. The air absorbs the heat of the solar hot water through the heat exchanger and preheats it before passing through the evaporator. The disadvantage is that the fan work is increased due to the increase of wind resistance. If the temperature of the air after passing through the heat exchanger is high, the temperature after passing through the evaporator may be higher than the temperature of the outside air, which will lose the original function of the heat pump for the utilization of air source heat energy, wasting part of the energy, and the temperature after passing through the heat exchanger is low. It may not be able to prevent the evaporator from frosting, nor can it effectively defrost with the help of solar energy, and the traditional defrosting method must be used, so that the comprehensive COP (energy efficiency ratio) of the system cannot be maximized

The direct expansion type limits the area of ​​solar energy utilization, and is prone to additional failures and unfavorable factors such as increased maintenance costs

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