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Adsorption refrigeration cycle with mass recovery process for low heat source temperature

具有低热源温度的质量回收工艺的吸附式制冷循环

基本信息

批准号：
16360102
负责人：
AKISAWA Atsushi
金额：
$ 9.47万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The objective of this study is to develop advanced adsorption refrigeration cycle driven by low temperature heat so that wasted heat of low temperature can be utilized. While conventional single stage adsorption cycle using Silica-gel and water as working media needs 80 degree C, proposed advanced cycle called "Reheat cycle" can operates at 60 degree C. It is because reheat cycle works similarly to double stage adsorption cycle even though the cycle configuration is the same as single stage cycle.In this study, the performance of reheat cycle was investigated by numerical simulations. Furthermore, experiments were conducted in order to examine the performance actually. The results indicate that the performance with relatively higher driving temperature becomes larger when the cycle time is controlled to be short. In contrast, the cycle gives a certain cooling capacity for low driving temperature as the double stage cycle can do when the cycle is operated with long cycle time. In other … More words, the proposed cycle has much flexibility to adjust to external operating conditions. Sensitivity analyses of cycle time, mass recovery time or temperature of driving heat source were employed to understand the effect of such parameters on the performance of cooling output and COP (Coefficient of Performance) experimentally.Reheat two stage cycle was expanded to three stage cycle in reheat scheme. The cycle was modeled and simulated numerically, which indicates that the new cycle can operate at even lower driving heat source temperature than reheat two stage cycle.One of the applications of reheat scheme is to assist single stage cycle with three adsorption beds. While conventional single stage cycle has two beds, reheat cycle has four beds. The proposed cycle has extra bed, the third bed, working twice as quickly as the others do and connecting the other two beds alternately for mass recovery process. The cycle simulation clarified that the proposed cycle has higher performance than the conventional cycle. Less

本研究的目的是开发先进的低温热驱动的吸附制冷循环，使低温余热得到充分利用。传统的以硅胶和水为工作介质的单级吸附循环需要80℃的温度，而改进的再热循环可以在60℃下运行，这是因为再热循环的工作原理类似于双级吸附循环，即使循环结构与单级循环相同。此外，还进行了实验，以检验其实际性能。结果表明，当控制循环时间较短时，驱动温度相对较高的性能变大。相反，该循环在较低的驱动温度下提供了一定的冷却能力，就像双级循环在循环时间较长时所能做到的那样。在其他…中换句话说，拟议的周期具有很大的灵活性，可以根据外部运行条件进行调整。通过对循环时间、质量恢复时间或驱动热源温度的敏感性分析，通过实验了解这些参数对制冷输出性能和性能系数COP的影响，将再热两级循环扩展为三级循环。对循环进行了建模和数值模拟，结果表明，新循环可以在比两级再热循环更低的驱动热源温度下运行，再热方案的应用之一是辅助单级三吸附床循环。常规单级循环有两个床层，再热循环有四个床层。建议的循环有额外的床位，即第三个床位，工作速度是其他床位的两倍，并交替连接其他两个床位进行大规模回收过程。循环仿真结果表明，该循环比传统循环具有更高的性能。较少