Solar double effect absorption heat pump system combining three phase energy storage

Abstract

The invention discloses a solar double effect absorption heat pump system combining three phase energy storage and belongs to the field of solar heat pumps. By taking a lithium bromide aqueous solution as an energy storage medium, a three phase energy storage system and a generator in a conventional solar double effect absorption heat pump system are connected in parallel, a heat collecting mediumin a tank type solar heat collector provides heat to the energy storage tank and a high pressure generator, separately, and on the basis of meeting the heat requirement of users, residual solar heat-collecting capacity is stored in the three phase energy storage system in a form of chemical potential energy, so that the solar energy is utilized efficiently. The system disclosed by the invention avoids risks caused by crystallization in serial connection of a two phase energy storage device and the generator in the prior art, and the load regulating action on a solar air conditioner by the energy storage system can be achieved by means of high energy storage densities of vapor, liquid and solid phases. The size of the energy storage tank is reduced by more than a half compared with that ofthe two phase energy storage mode as a result of a 50% crystallization rate. The system is simple, convenient and flexible to regulate and easy to transform a common solar double effect absorption heat pump system into the energy storage type solar double effect absorption heat pump system.

Description

technical field [0001] The invention belongs to the technical field of solar heat pumps, in particular to a solar double-effect absorption heat pump system combined with three-phase energy storage. Background technique [0002] Solar thermal utilization is one of the main forms of utilization of solar energy. In order to improve the utilization rate of solar energy and solve the problem of no solar radiation at night, the energy storage method and its organic combination with the heat pump method are the key to further high efficiency, low cost and large-scale application of solar heat pumps. The energy storage of solar absorption heat pump system usually adopts sensible heat energy storage and phase change energy storage. The former mainly adopts the form of hot water storage. The main disadvantage is that the energy storage density is low. Large heat transfer temperature difference, low energy storage and energy release rate. Chemical solution energy storage based on the...

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Problems solved by technology

However, the current energy storage solar heat pump adopts the vapor-liquid two-phase energy storage method, and the energy storage device is connected in series with the generator in the absorption heat pump system. This energy storage method has several serious shortcomings: 1) When the energy storage ends, the solution The concentration should not be too high to avoid the danger of crystallization, or to dissolve the crystals by adding complex devices; 2) The solar energy cannot be fully utilized, and refrigerant vapor cannot be generated for several hours before sunset; 3) The system is complex, driving heat sources and heat pumps The matching control of the load size is more difficult; 4) The heating capacity of the energy release process system is getting lower and lower

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