Three-stage isothermal equilibrium ammonia-water reabsorption heat pump cycle and heat supply method

Abstract

The invention relates to three-level isothermal balanced ammonia-water reabsorption type heat pump circulation equipment. The three-level isothermal balanced ammonia-water reabsorption type heat pumpcirculation equipment comprises a solution loop, refrigerant steam pipelines, a water supply and return pipeline and driving heat sources. The solution loop comprises a high pressure generator, a highpressure absorber, a middle-high pressure generator, a middle-high pressure absorber, a middle-low pressure generator, a middle-low pressure absorber, a low pressure generator, a low pressure absorber, four throttling valves, a low pressure solution mixing tank, a high pressure solution separation tank, two solution mixing / separation tanks, three solution circulating pumps, three high temperaturesolution heat exchangers, three low temperature solution heat exchangers and six three-way valves. The refrigerant steam pipelines comprise the high pressure refrigerant steam pipeline, the middle-high pressure refrigerant steam pipeline, the middle-low pressure refrigerant steam pipeline and the low pressure refrigerant steam pipeline. The water supply and return pipeline comprises a water supply pipeline body and a water return pipeline body. The driving heat sources comprise the high temperature driving heat source and the low temperature driving heat source. A heat supply method implemented through the equipment comprises the processes of water supply and return circulation, ammonia solution circulation and ammonia steam pipeline operation.

Description

technical field [0001] The invention relates to the field of solar heat utilization and heat pump air conditioning, in particular to a three-stage isothermal balance ammonia-water reabsorption heat pump cycle equipment and a heat supply method. Background technique [0002] At present, solar energy development and utilization methods are relatively simple, and most of them are low-temperature hot water. Solar heating, cooling, industrial heating and solar thermal power generation have been applied, but are far from reaching scale. Among the various implementations of solar heating, under given conditions, it is better to use solar collectors to generate heat to drive heat pumps, which can theoretically convert 80% of solar radiation energy into heating capacity. [0003] After searching the open literature of the prior art, it is found that the current solar heat pump heating still has problems such as instability and inefficiency. The energy density of solar energy is low...

AI Technical Summary

Problems solved by technology

The energy density of solar energy is low, and solar radiation is intermittent and unstable due to day and night and weather changes

However, the heating requirements are stable and reliable; the ambient temperature is low in winter and the sunshine time is short, which will increase the heat loss of the solar system, and the heat collection temperature is not high, but the efficiency reduction will lead to the inability to meet the heating load requirements

Theoretically, conventional absorption and adsorption heat pumps driven by thermal energy combined with solar collectors can be used for heating, but the traditional absorption or adsorption heat pump cycles using water as the working fluid are difficult to meet the requirements of low-temperature freezing environments, and ammonia and other low-boiling-point working fluids are used The heat pump system requires a high temperature of the driving heat source (generally greater than 120°C), and it is completely driven by solar collectors, and the working time is short or it is difficult to start

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