Heat transfer and exergy analysis of a novel solar-powered integrated heating, cooling, and hot water system with latent heat thermal energy storage
Heat transfer and exergy analysis of a novel solar-powered integrated heating, cooling, and hot water system with latent heat thermal energy storage
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DOI：
10.1016/j.enconman.2018.08.105
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发表时间：
2018-11
影响因子：
10.4
通讯作者：
H. Shabgard;Li Song;Weiwei Zhu
中科院分区：
文献类型：
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作者：
H. Shabgard;Li Song;Weiwei Zhu
建立了太阳能集热、制冷、热水系统的热网络模型，研究了由真空管集热器、潜热蓄热单元及相关换热器和吸收式制冷机/热泵组成的太阳能集热、制冷、热水系统的性能。系统性能研究的住宅建筑在炎热的气候区（亚利桑那州凤凰城）在两个典型的太阳日代表一个相对寒冷的一天，一个相对炎热的一天。提出了一种系统的尺寸设计方法，以最小化相变材料质量和输出温度波动。还进行了火用分析，以量化系统的第二定律效率。系统的能量性能分析表明，使用10 m2的太阳能集热器面积加上29 kWh的潜热热能储存系统，可以实现超过80%的年节能。的热能储存系统的传热设计的效果，特别是输入热管的冷凝器管和输出热管的蒸发器部分嵌入在相变材料内的数量，对系统的热和火用性能的影响也进行了研究。结果表明，增加管道的数量减少的温度波动，并增加火用效率，由于最小化的温度下降。定量地，将管道的数量从60增加到112，将潜热热能储存系统上的最大温度降从约30 °C降低到15 °C，并且将有效能效率从约75%增加到90%。这项研究表明，太阳能热动力加热，冷却和热水系统集成潜热热能储存显着减少所需的辅助能量输入，以满足位于炎热气候区的住宅建筑的需求的能力。
A thermal network model is developed to study the performance of a solar thermal-powered heating, cooling and hot water system comprised of evacuated tube collectors, a latent heat thermal energy storage unit and related heat exchangers, and an absorption chiller/heat pump. The system performance is studied for a residential building in a hot climate zone (Phoenix, Arizona) on two typical solar days representative of a relatively cold day and a relatively hot day. A systematic sizing methodology is presented to minimize the phase change material mass and the output temperature fluctuations. An exergy analysis is also performed to quantify the second law efficiency of the system. Analysis of the energy performance of the system shows that more than 80% annual energy saving can be achieved by using a solar collector area of 10 m2coupled with a 29 kWh latent heat thermal energy storage system. The effect of the heat transfer design of the thermal energy storage system, in particular the number of condenser pipes of the input heat pipe and evaporator sections of the output heat pipes embedded within the phase change material, on the thermal and exergetic performance of the system is also investigated. It is shown that increasing the number of pipes decreases the temperature fluctuations and increases the exergy efficiency due to minimized temperature drops. Quantitatively, increasing the number of pipes from 60 to 112, decreases the maximum temperature drops across the latent heat thermal energy storage system from about 30 °C to 15 °C, and increases the exergy efficiency from about 75% to 90%. This study demonstrates the capability of a solar thermal-powered heating, cooling and hot water system integrated with latent heat thermal energy storage to significantly reduce the auxiliary energy input needed to meet the demands of a residential building located in a hot climate zone.