Performance Analysis of Variable Mode Adsorption Chiller at Different Recooling Water Temperatures

Ahmad A. Alsarayreh, Ayman Al-Maaitah, Menwer Attarakih and Hans-Jörg Bart
Additional contact information
Ahmad A. Alsarayreh: Precision Industries, Dubai P.O. Box 37448, United Arab Emirates
Ayman Al-Maaitah: Wahaj Investment L.L.C., 24B St, Comm-365, Ind 2, Dubai P.O. Box 37448, United Arab Emirates
Menwer Attarakih: Department of Chemical Engineering, University of Jordan, Queen Rania St, Amman 11942, Jordan
Hans-Jörg Bart: Thermische Verfahrenstechnik, TU Kaiserslautern, 67653 Kaiserslautern, Germany

Energies, 2021, vol. 14, issue 13, 1-26

Abstract: Adsorption cooling can recover waste heat at low temperature levels, thereby saving energy and reducing greenhouse gas emissions. An air-cooled adsorption cooling system reduces water consumption and the technical problems associated with wet-cooling systems; however, it is difficult to maintain a constant recooling water temperature using such a system. To overcome this limitation, a variable mode adsorption chiller concept was introduced and investigated in this study. A prototype adsorption chiller was designed and tested experimentally and numerically using the lumped model. Experimental and numerical results showed good agreement and a similar trend. The adsorbent pairs investigated in this chiller consisted of silicoaluminophosphate (SAPO-34)/water. The experimental isotherm data were fitted to the Dubinin–Astakhov (D–A), Freundlich, Hill, and Sun and Chakraborty (S–C) models. The fitted data exhibited satisfactory agreement with the experimental data except with the Freundlich model. In addition, the adsorption kinetics parameters were calculated using a linear driving force model that was fitted to the experimental data with high correlation coefficients. The results show that the kinetics of the adsorption parameters were dependent on the partial pressure ratio. Four cooling cycle modes were investigated: single stage mode and mass recovery modes with duration times of 25%, 50%, and 75% of the cooling cycle time (denoted as short, medium, and long mass recovery, respectively). The cycle time was optimized based on the maximum cooling capacity. The single stage, short mass recovery, and medium mass recovery modes were found to be the optimum modes at lower (<35 °C), medium (35–44 °C), and high (>44 °C) recooling temperatures. Notably, the recooling water temperature profile is very important for assessing and optimizing the suitable working mode.

Keywords: adsorption; zeolite; SAPO-34; adsorption cooling; mass recovery; variable mode (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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