Performance of diffusion absorption refrigeration cycle with organic working fluids |
| |
Authors: | A Zohar M Jelinek A Levy I Borde |
| |
Affiliation: | aPearlstone Center for Aeronautical Engineering Studies, Mechanical Engineering Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel |
| |
Abstract: | A diffusion absorption refrigeration (DAR) cycle is driven by heat and utilizes a binary solution of refrigerant and absorbent as working fluid, together with an auxiliary inert gas. Commercial DAR systems operate with ammonia–water solution and hydrogen or helium as the inert gas. In this work, the performance of a simplified DAR system working with an organic absorbent (DMAC – dimethylacetamide) and five different refrigerants and helium as inert gas was examined numerically, with the aim of lowering the generator temperature and system pressure along with a non-toxic refrigerant The refrigerants were: chlorodifluoromethane (R22), difluoromethane (R32), 2-chloro-1,1,1,2-tetrafluoroethane (R124), pentafluoroethane (R125) and 1,1,1,2-tetrafluoroethane (R134a). The results were compared with the performance of the same system working with ammonia–water and helium. Similar behavior was found for all systems, regarding the coefficient of performance (COP) and rich and poor solution concentrations as functions of generator temperature. It was found that typical generator temperature with the new substances was 150 °C, yet lower COPs, higher evaporator temperatures and lower condensation temperature of about 40 °C governed these systems. |
| |
Keywords: | Absorption system Diffusion system Calculation Performance R22 R32 R124 R125 R134a Helium Comparison Ammonia– waterMots clé s: Systè me à absorption Systè me à diffusion Calcul Performance R22 R32 R124 R125 R134a Hé lium Comparaison Ammoniac– eau |
本文献已被 ScienceDirect 等数据库收录! |
|