Solar energy and electric energy combined heat pump system and cooling and heating method

Abstract

The invention discloses a solar energy and electric energy combined heat pump system and a cooling and heating method. The heat pump system comprises a solar energy absorption heat pump unit, an intermediate work medium circulating device and a compression heat pump unit, wherein a solar drive absorption heat pump drives the absorption heat pump unit to prepare a lower-temperature intermediate work medium or higher-temperature intermediate work medium; the intermediate work medium bears partial / all cold energy / heat energy required by a user through first heat mass exchange equipment, and enters an intermediate heat exchanger of the compression heat pump unit for heat exchange; and the cold energy / heat energy contained in the intermediate work medium is recycled once again through the heat pump unit so as to save the electric consumption of the compressor of the compression heat pump unit. The system realizes high-efficiency utilization of a low-level renewable energy source solar energy, and has the advantages of stable and reliable operation, efficient energy utilization, good energy-saving effect and wild application prospect.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to absorption heat pumps and compression heat pumps. Background technique [0002] The solar-driven absorption heat pump uses solar energy as the driving force, uses lithium bromide aqueous solution or ammonia solution as the absorbent, and uses water and ammonia as the refrigerant. It is energy-saving and environmentally friendly. However, solar-driven absorption heat pumps have disadvantages such as high temperature requirements, auxiliary heating, low unit efficiency, and intermittent work due to changes in sunlight intensity, which limit their popularization and application. [0003] Compression heat pumps driven by electric energy have the advantages of meeting the cooling and heating needs of users and continuous and stable operation. However, compression heat pumps driven by electric energy consume high-grade electric energy and do not have the advantages of energy saving ...

AI Technical Summary

Problems solved by technology

However, solar-driven absorption heat pumps have disadvantages such as high temperature requirements, auxiliary heating, low unit efficiency, and intermittent work due to changes in sunlight intensity, which limit their popularization and application.

[0003] Compression heat pumps driven by electric energy have the advantages of meeting the cooling and heating needs of users and continuous and stable operation. However, compression heat pumps driven by electric energy consume high-grade electric energy and do not have the advantages of energy saving and emission reduction.

In addition, the extensive use of compression heat pumps driven by electric energy is also likely to cause the problem of "power peaks and valleys" in winter and summer.

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