Vol.30 No.1(11) [2008]

Transient Behavior of Activated Carbon Fiber-Ethanol Based Two-Stage Adsorption Chiller

Ibrahim Ibrahim El-SHARKAWY, Bidyut Baran SAHA, Anutosh CHAKRABORTY, Mahmoud HASSAN and Shigeru KOYAMA


In this study, an analytical investigation on the performance of a low temperature solar or waste heat driven two-stage adsorption chiller is performed. Activated carbon fiber (ACF) of type (A-20) and ethanol are used as adsorbent-refrigerant pair. This innovative system can be driven by heat source of temperature between 50 and 70 degree C in combination with a heat sink of 30 degree C.
A mathematical model is developed to analyze the dynamic behavior of the cycle as well as the influence of operating conditions on the cycle performance in terms of cooling capacity and COP. The main advantage of this advanced chiller is that it can be operational with smaller regenerating temperature lifts ({delta}Treg = heat source − heat sink inlet temperatures) than other heat-driven single-stage adsorption systems.