Study on an activated carbon fiber-ethanol adsorption chiller: Part II - performance evaluation

This article presents the performance evaluation of a two-bed, activated carbon fiber (ACF)-ethanol adsorption chiller, which has been studied on the basis of the transient modelling developed by the same authors [B.B. Saba, I.I. EI-Sharkawy, A. Chakraborty, S. Koyama, Study on an activated carbon fiber-ethanol adsorption chiller: Part I - system description and modelling, International Journal of Refrigeration, submitted for publication]. This innovative adsorption chiller, where pitch based ACF of type A-20 is taken as the adsorbent utilizes effectively the low-temperature waste heat sources of temperature between 60 and 95 degrees C along with a cooling source at ambient temperature. We have found that, regardless of the initial mass distribution, the ACF-ethanol adsorption chiller is able to achieve the same cyclic-steady-state within three half cycles or 1890 s. Simulation results show that the optimum COP values are obtained at driving source temperatures between 80 and 85 degrees C and makes this chiller suitable for low-temperature waste heat recovery with relatively higher performance. (c) 2006 Elsevier Ltd and IIR. All rights reserved.