Effect of Design and Operating Parameters on the Performance of Two-Bed Sorption Heat Pump Systems

[+] Author and Article Information
W. Zheng, W. M. Worek

The University of Illinois at Chicago, Department of Mechanical Engineering (m/c 251), 842 West Taylor Street, Chicago, IL 60607-7022

G. Nowakowski

Gas Research Institute, Chicago, IL 60631-3562

J. Energy Resour. Technol 117(1), 67-74 (Mar 01, 1995) (8 pages) doi:10.1115/1.2835323 History: Received March 14, 1994; Revised November 15, 1994; Online January 22, 2008


The effect of design and operating parameters on the performance of closed-cycle, two-bed sorption heat pump systems were investigated. The parameters studied in this paper included the effects of bed switching frequency (i.e., the switching speed), the sorbent bed NTU, the thermal resistance within the sorbent, the contact resistance between the sorbent and the tube wall of the heat transfer fluid, the fraction of inert mass within the sorbent bed heat exchanger, and the amount of fluid resident within the heat exchanger. The results show that the performance of a sorption heat pump system is extremely sensitive to the switching speed. In fact, the value of the switching speed that optimizes the COP is different from the value that optimizes the overall cooling capacity. Such a performance characteristic allows the design of multispeed sorbent bed heat pumps to be operated in such a way to follow the load while still maximizing the system COP. However, operation of the system at switching speeds away from the optimum values can cause a dramatic deterioration in system performance.

Copyright © 1995 by The American Society of Mechanical Engineers
Topics: Sorption , Design , Heat pumps
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