Gaseous solubility and thermodynamic performance of absorption system using R1234yf/IL working pairs

To overcome the weaknesses of traditional working pairs (H₂O/LiBr and NH₃/H₂O) in the absorption-refrigeration systems, 2,3,3,3-tetrafluoroprop-1-ene (R1234yf)/ionic liquid (IL) as a promising working pair has attracted wide attention. Using an isochoric saturation method, the solubilities were measured for three working pairs (R1234yf/[emim][Ac], R1234yf/[bmim][Ac] and R1234yf/[P₆₆₆₁₄][Cl]) from 283.15 to 343.15 K and the data was correlated by the NRTL model. Solubilities rise with a decrease in temperature and an increase in pressure. Highest solubility is in [P₆₆₆₁₄][Cl], followed by [bmim][[Ac] and [emim][Ac]. The cooling performance was studied for the single-effect and compression-assisted system using several R1234yf/IL mixtures. The effects of compression ratio, generation and evaporation temperature on the coefficient performance (COP) and circulation ratio were analyzed. Under the condensation temperature of 303 K, generation temperature of 363 K and absorption temperature of 303 K, the maximum COPs for [emim][Ac], [bmim][Ac] and [P₆₆₆₁₄][Cl] are respectively 013, 0.23, and 0.46 in the compression-assisted system. [P₆₆₆₁₄][Cl] has the highest COP and exergy coefficient of performance (ECOP) while [emim][Ac] shows lowest under the same condition.