<i>p</i>−<i>T</i>−<i>x</i> Measurements for Some Working Fluids for an Absorption Heat Transformer: 1,1,1,2-Tetrafluoroethane (R134a) + Dimethylether Diethylene Glycol (DMEDEG) and Dimethylether Triethylene Glycol (DMETrEG)

Abstract

The solubilities of 1,1,1,2-tetrafluoroethane (R134a), CF 3 CH 2 F, + dimethylether diethylene glycol (DMEDEG), CH 3 O(CH 2 CH 2 O) 2 CH 3, and R134a + dimethylether triethylene glycol (DMETrEG) binary systems were measured, using the “static−analytic” method at temperatures between (303 and 353) K. This work was an opportunity to test the use of R134a as a refrigerant in combination with an organic absorbent, like DMEDEG and DMETrEG, in an absorption heat transformer (AHT), also known as a type II absorption heat pump or a reversed absorption heat pump. The experimental data were correlated using the Peng−Robinson equation of state (PR-EoS) in combination with Mathias−Copeman α function, Huron−Vidal mixing rules, and the nonrandom two-liquid (NRTL) activity coefficient model. The experimental results were compared to the predicted values obtained using the predictive Soave−Redlich−Kwong group contribution equation of state (PSRK-EoS).