Thermodynamic properties and performance evaluation of [EMIM] [DMP]‐H 2 O working pair for absorption cooling cycle

Abstract

The combination of ionic liquid-refrigerant based [EMIM][DMP]-H2O as an alternative working pair for single effect vapor absorption cycles (VACs) is assessed and optimized by using energy and exergy based performances. Thermodynamics properties of binary mixture of [EMIM] [DMP]-H2O like Dühring's (P-T-x1) and h-T-X1 plots are computed from the activity coefficient based non-random two-liquid model (NRTL) model. Further modeling and simulation of VACs are accomplished in open source Scilab as mathematical programing software and used to ascertain the optimal generator temperature established on energetic and exergetic COP. Optimal results include an extensive range of temperatures like Te from 2.5 to 15°C and Ta and Tc from 30 to 45°C. Simulation of the single effect VAC with SHE by using [EMIM][DMP]-H2O mixture at Te = 10°C, Tg = 100°C, Ta = 30°C, and Tc = 40°C were evaluated and compared with the 5 working fluids. Simulation outcomes depicted greater COP of 0.82 for [EMIM][DMP]-H2O in comparison with NH3-H2O, EMISE-H2O, [EMIM][BF4]-H2O and nearly equal to LiBr-H2O (COP = 0.83). In addition, the effect of Tg on the COP, ECOP f, and composition are compared and optimized for the evaporation temperature range from 2.5 to 15°C, Ta/Tc from 30 to 45°C and cooling water (CW) flow in series and parallel. Additionally, the optimal Tg exhibited distinction based on energy and exergy analysis. Thus, it resulted in optimized performances of [EMIM] [DMP]-H2O that can be suitable to replace corrosive aqueous LiBr in VACs.