Influence of cycle time and collector area on solar driven adsorption chillers
Influence of cycle time and collector area on solar driven adsorption chillers
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DOI：
10.1016/j.solener.2016.07.023
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发表时间：
2016-10
期刊：
影响因子：
6.7
通讯作者：
A. Jaiswal;S. Mitra;P. Dutta;K. Srinivasan;S. S. Murthy-S.
中科院分区：
文献类型：
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作者：
A. Jaiswal;S. Mitra;P. Dutta;K. Srinivasan;S. S. Murthy-S.
对印度班加罗尔的一台单级双床硅胶+水吸附式制冷机的动态性能进行了研究。驱动热能直接由真空管太阳能收集器场提供。在没有蓄热的情况下评估系统动态，这会导致热源和蒸发器温度的日内波动，从而影响系统性能。这些动态表现为代表性的几天在4月（夏季）和12月（冬季）。重点是收集器面积和吸附循环时间的变化对系统性能的影响。传热流体（水）的最高温度限制为95 °C。太阳能性能系数（DACOPsol）和制冷量（DACC）的周期平均值和日平均值被用作关键性能指标。本研究的一个关键方面是表明，通过适当选择收集器面积和循环时间，两者都可以最大化。此外，它表明，这里描述的太阳能驱动的吸附式制冷机是非常适合与风冷R-134 a蒸汽压缩制冷系统（VCRS）级联。从太阳能吸附式制冷机获得的可变吞吐量可以帮助液体过冷，从而弥补由于环境温度高而导致的VCR制冷能力的不足。
Dynamic performance of a single-stage, two-bed, silica gel + water adsorption chiller operating in Bangalore, India is studied. Driving thermal energy is provided directly by an evacuated tube solar collector field. System dynamics are evaluated in the absence of thermal storage, which causes intra-day fluctuations in heat source and evaporator temperatures, which in turn influence the system performance. These dynamics are demonstrated for representative days in the months of April (summer) and December (winter). The focus is on the effect of variation of the collector area and the adsorption cycle time on the system performance. The maximum temperature of heat transfer fluid (water) is limited to 95 °C. The cyclic and daily averages of solar coefficient of performance (DACOPsol) and cooling capacity (DACC) are used as key performance indicators. One of the key aspects of the this study is to show that both of them can be maximized by suitably choosing the collector area and cycle time. Further, it is demonstrated that the solar driven adsorption chiller described here is ideally suited for cascading with an air-cooled R-134a vapour compression refrigeration system (VCRS). The variable throughput obtained from the solar adsorption chiller can help in liquid sub-cooling and hence to cover the deficit in cooling capacity of theVCRSarising due to high ambient temperature.