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由低温热驱动的先进吸附制冷循环，以便利用低温废热，而使用硅胶和水作为工质的传统单级吸附循环需要80℃，提出了先进的吸附制冷循环。称为“再热循环”的循环可以在 60 摄氏度下运行。这是因为再热循环的工作原理与双级吸附循环类似，尽管循环配置与单级循环相同。在本研究中，再热循环的性能通过数值此外，还进行了实验以实际检验其性能，结果表明，当循环时间控制得较短时，其性能会变大；相反，循环时间越短，则具有一定的冷却能力。换句话说，所提出的循环具有很大的灵活性，可以适应外部操作条件的循环时间、质量恢复时间或温度。采用驱动热源来了解这些参数对再热方案中的再热两级循环扩展到三级循环，并对循环进行了数值模拟，结果表明新循环可以在更低的驱动热源温度下运行。再热方案的应用之一是辅助具有三个吸附床的单级循环，而传统的单级循环有两个床，而再热循环有四个床。工作速度是原来的两倍其他人这样做并交替连接其他两个床以进行质量回收过程。循环模拟表明，所提出的循环具有比传统循环更高的性能。