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Indexed by:期刊论文

Date of Publication:2012-05-01

Journal:APPLIED THERMAL ENGINEERING

Included Journals:SCIE、EI

Volume:37

Page Number:129-135

ISSN No.:1359-4311

Key Words:Single-gage absorption heat transformer; Working pair; Ionic liquid; Coefficient of performance; Exergy efficiency

Abstract:The performance simulation of a single-stage absorption heat transformer using a new working pair composed of ionic liquids, 1-ethyl-3-methylimidazolium dimethylphosphate, and water (H2O + IEMIMI [DMP]), was performed based on the thermodynamic properties of the new working pair and on the mass and energy balance for each component of the system. In order to evaluate the new working pair, the simulation results were compared with those of aqueous solution of lithium bromide (H2O + LiBr), Trifluoroethanol (TFE) + tetraethylenglycol dimethylether (E181).
   The results indicate that when generation, evaporation, condensing and absorption temperatures are 90 degrees C, 90 degrees C, 35 degrees C and 130 degrees C, the coefficients of performance of the single-stage absorption heat transformer using H2O + LiBr, H2O + [EMIM][DMP] and TFE + E181 as working pairs will reach 0.494, 0.481 and 0.458 respectively. And the corresponding exergy efficiency will reach 0.64, 0.62 and 0.59, respectively. Meanwhile the available heat outputs for per unit mass of refrigerant are 2466 kJ/kg, 2344 kJ/kg and 311 kJ/kg, respectively.
   The above excellent cycle performance together with the advantages of negligible vapor pressure, no crystallization and more weak corrosion tendency to iron-steel materials may make the new working pair better suited for the industrial absorption heat transformer. (C) 2011 Elsevier Ltd. All rights reserved.