Solar air source heat pump unit

Abstract

The invention provides a solar air source heat pump unit. The solar air source heat pump unit comprises an air source heat pump system and a solar heat collecting system, wherein the air source heat pump system is connected with a water circulation system of a heat user, exchanges heat with the water circulation system and includes an evaporator; the solar heat collecting system comprises a solarcollector and a heat exchanger which are connected to each other in an end-to-end mode; the solar collector can heat an internal heat conduction medium through solar energy and conveys the heated internal heat conduction medium into the heat exchanger; the heat exchanger can convey the heat-exchanged heat conduction medium back to the solar collector; and the heat exchanger and the evaporator arearranged in parallel, the heat exchanger can pre-heat outdoor air and then conveys the outdoor air to the evaporator, and the pre-heated outdoor air can exchange heat with a refrigerant in the evaporator and then is exhausted. The solar air source heat pump unit has the beneficial effect that the effects that the heat pump unit runs normally under the condition of low outdoor environment in winter, and meanwhile, and frosting of an air source heat pump system is relived are achieved.

Description

technical field [0001] The invention relates to the field of air heat source pumps, in particular to a solar air source heat pump unit. Background technique [0002] As a kind of energy-saving technology, heat pump has been widely valued by all countries in the world, and air source heat pump can absorb abundant low-grade energy from the ambient atmosphere and generate high-grade energy for users to use for heating in winter. This product is easy to use and low in installation costs , has become the most widely used type of heat pump. [0003] Air source heat pumps perform well when the ambient temperature is relatively high. However, in the case of low outdoor environment, the heat pump system cannot operate efficiently, reliably and stably. As the outdoor temperature decreases in winter, the surface temperature of the evaporator will be lower than 0°C, and the outdoor air will flow through the surface of the evaporator to form a frost layer, which will cause the heat tra...

AI Technical Summary

Problems solved by technology

However, in the low outdoor environment, the heat pump system cannot operate efficiently, reliably and stably

As the outdoor temperature decreases in winter, the surface temperature of the evaporator will be lower than 0°C, and the outdoor air will flow through the surface of the evaporator to form a frost layer, which will cause the heat transfer of the evaporator to deteriorate, thereby affecting the overall performance of the compressor and heat pump.

When the outdoor temperature is very low, the start-up time is too long, and the unit cannot work normally in extreme cases

In a low temperature environment, the heating capacity of the air source heat pump can no longer meet the heating needs of users

At the same time, as the pressure ratio of the compressor increases, its energy efficiency ratio (COP) drops sharply, and the exhaust temperature rises rapidly, resulting in the compressor not operating normally or even damaged

These factors have restricted the development and application of air source heat pumps.

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