Solar photovoltaic-mains supply hybrid-driven cool and heat storage heat pump unit

Abstract

The invention provides a solar photovoltaic (PV)-mains supply hybrid-driven cold and heat storage heat pump unit which is equipped with a DC compressor and an AC compressor. The heat pump unit is a dual-power heat pump system driven via a solar PV DC power supply and a common mains supply AC power supply in a hybrid manner. In the invention, in the case of sunlight, the DC refrigeration compressor is directly driven by DC generated by a solar panel to obtain refrigeration and heat capacity that can be stored by virtue of a phase-change cool storage medium and a heat storage medium, thus compensating the defects of solar intermittence and climate dependence. When the AC power supply from a power grid is used instead of the DC power supply, the adaptability of a solar air-conditioning system is greatly improved and the initial investment of the system is obviously reduced.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 200910076400.X. technical field [0002] The invention relates to a heat pump system, in particular to a dual-power heat pump system driven by a combination of solar photovoltaic direct current power supply and common commercial AC power supply. Background technique [0003] Heat pump water heaters have remarkable energy-saving effects. Compared with ordinary electric water heaters, since the efficiency of heat pump water heaters is greater than 1, for every 1kW of electricity consumed, 3-4kW of hot water can be obtained, so its energy-saving effect is obvious. The heat pump cold and hot water unit (water-cooled cold water type refrigerator) can also produce cold water while producing hot water. The hot water produced by it can be used for heating and domestic hot water. The cold water can be used for air conditioning and domestic cold water in winter. One machine is multi-purpose, and sav...

AI Technical Summary

Problems solved by technology

Ordinary solar water heaters cannot produce cold water while producing hot water

Moreover, although solar energy itself is an inexhaustible and inexhaustible clean energy, due to its intermittent and climate-dependent characteristics, solar water heaters can only function when there is sufficient sunlight during the day, and it is best to use them on cloudy days and at night. When hot water is needed, it cannot be used

[0005] At present, the existing solar photovoltaic vapor compression refrigeration system uses an inverter, that is, the direct current output from the solar panel is first boosted, inverted and turned into alternating current, and then the alternating current is used to drive the AC compressor, while the inverter The price is expensive, which increases the cost of the system

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