Solar assisted heat pump heater and control method

Abstract

The invention relates to a solar assisted heat pump heater and a control method. The heater comprises a heat pump system, wherein the heat pump system comprises a blow expansion type evaporator, a compressor, a condenser and an electronic expansion valve and is used for allowing cold media to flow, and the condenser is arranged in a water tank and / or outside the water tank, so that the cold media flowing through the evaporator are subjected to heat exchange with water in the water tank; temperature sensors for detecting temperature of the flowing cold media are arranged on an air suction pipeline and an air exhaust pipeline of the compressor respectively. When the temperature Tr of the water tank is lower than a set value T1, corresponding electronic expansion valve opening is obtained according to a temperature detection value of an air suction end of the compressor; when the temperature Tr of the water tank is higher than the set value T1, the corresponding electronic expansion valve opening is obtained according to a temperature detection value of an air exhaust end of the compressor. According to the device and the method, indexing control is adopted according to the water temperature of the water tank during heating of the heat pump, so that the control precision of the electronic expansion valve is higher in a preparation process, the heating efficiency is improved, and the energy consumption is reduced.

Description

technical field

[0001] The present invention relates to a solar heat pump water heater in the field of water heaters, in particular to a heat pump water heater capable of heating by using solar energy and air energy at the same time; and also relates to a control method of the above water heater. Background technique

[0002] At present, evaporators are mostly used in refrigerators, freezers, wine cabinets, air energy heat pumps and other products on the market. Solar heat pump evaporators appear in the market later, and the products are larger than refrigerators, freezers, wine cabinets, and air energy heat pump evaporators. Although it appeared late, solar heat pump water heaters have developed rapidly because of their advantages such as high heat conduction efficiency and fast heat exchange rate.

[0003] In addition, after the solar heat pump water heater adopts the expansion evaporator, it can absorb both solar radiation heat and heat in the air. Therefore, a new contr...

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