Solar energy and air source heat pump joint heating and defrosting system

Abstract

The invention discloses a solar energy and air source heat pump joint heating and defrosting system which comprises an outdoor side heat exchanger, a four-way reversing valve, a gas-liquid separator,a compressor, an indoor side heat exchanger, an expansion valve, a solar heat storage water tank, a solar heat collection plate, a circulating water pump, a temperature sensor, a circuit switch, an electric defrosting heating pipe and a solenoid valve. The solar energy and air source heat pump joint heating and defrosting system has the advantages that (1) solar energy is sufficiently utilized, and consumption of electric energy can be lowered effectively; (2) the heating system can be switched among three operating modes, and the energy is saved to the largest limit under the situation that the demand for water heating by winter heating is meet; (3) heat is supplied to the indoor space during defrosting, and the problems of indoor temperature decreasing and indoor comfort lowering which are caused by reverse-cycle defrosting are avoided; and (4) defrosting is conducted through the energy stored by the solar energy, the wasted work of the compressor and the defrosting time are reduced,and the energy-saving effect is better.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a combined heating and defrosting system of solar energy and air source heat pumps. Background technique [0002] With the increasing shortage of conventional energy and the serious pollution of the environment, the development and utilization of new energy has been paid more and more attention. Solar energy has a wide range of distribution, is safe and environmentally friendly, and is an inexhaustible renewable energy source. my country is rich in solar energy resources, and the areas with annual sunshine time exceeding 2200h account for about 2 / 3 of the total area of ​​the country, which has the economic value of utilizing solar energy. The annual average total solar radiation is 5.86GJ / m 2 , with good conditions for utilizing solar energy. The solar water heating system is widely used in various places because of its convenient and economical way of providing hot water f...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a combined heating and defrosting system of solar energy and air source heat pump. consumption; this system can also overcome the shortcomings of the traditional air source heat pump defrosting method, use solar energy to defrost, and take into account the heat supply to the room during defrosting, thus solving the problem of indoor temperature drop

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