Working domains of a novel solar-assisted GAX-based two-stage absorption-resorption heat pump with multiple internal heat recovery for space heating
Working domains of a novel solar-assisted GAX-based two-stage absorption-resorption heat pump with multiple internal heat recovery for space heating
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DOI：
10.1016/j.enconman.2020.113060
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发表时间：
2020-09
影响因子：
10.4
通讯作者：
T. Jia;Peng Chu;P. Dou;Yanjun Dai
中科院分区：
文献类型：
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作者：
T. Jia;Peng Chu;P. Dou;Yanjun Dai
氨-水吸收-再吸收式热泵在高效利用低温热能供热或提供热水方面具有巨大的潜力。然而，单级吸收-再吸收式热泵与传统的吸收式热泵相比，存在低温环境适应性差、供热温度低等缺点，限制了其在寒冷地区的应用。提出了一种新型的基于GAX的二级吸收-再吸收式热泵循环，旨在扩大其在低温环境下的应用范围，提高供热温度，更有效地利用太阳能进行空间供暖，延长太阳能的工作时间，提高太阳能的贡献率。可行的操作压力组合，使循环进行了调查。通过与单级循环的比较，揭示了不同运行压力组合下的性能系数、环境空气温度限制、热源温度需求、供热温度水平、热输入/输出和溶液循环比等。在给定的运行条件下，最大COP值为1.367，供热温度为46.1° C，循环可在-15.6 ° C以上运行。供热温度一般在42 ℃以上，适用于建筑地板采暖或风机盘管采暖。该循环可以由高于73° C的热源驱动，突出了将其与更经济的太阳能集热器集成以实现高效空间供暖的可能性。
Ammonia-water absorption-resorption heat pumps have great potential in efficiently utilizing low-temperature heat for space heating or hot water supply. However, single-stage absorption-resorption heat pumps have disadvantages of poor low ambient temperature adaptability and low heat supply temperature over conventional absorption heat pumps, which limit their applications in cold regions. In this paper, a novel GAX-based two-stage absorption-resorption heat pump cycle with multiple internal heat recovery is proposed aiming to expand the application scope at lower ambient temperatures, to raise the heat supply temperature and more significantly to utilize solar heat for space heating for longer solar working time with higher contribution. Feasible operation pressure combinations to enable the cycle were investigated. Coefficient of performance, ambient air temperature restrictions, heat source temperature demand, heat supply temperature level, heat inputs/outputs and solution circulation ratios of generators in terms of different operation pressure combinations were revealed by comparing with those of the single-stage cycle. Under given operation conditions, maximum COP value of 1.367 and heat supply temperature of 46.1° C can be obtained and the cycle could be operated at ambient air temperatures above-15.6° C. The heat supply temperature is generally above 42° C, which is suitable for building floor heating or fan coil heating. The cycle can be driven by heat source above 73° C, highlighting the possibility of integrating it with more economical solar collectors for high efficiency space heating.