Theoretic Study On Thermodynamic Performance Of New Absorption Working Pair CO2-[emim][Tf2N]

Under CFCs working pair influence on the ozone layer and environment,protecting theenvironment and looking for new working pair to replace traditional working pair becomesa common topic of concern throughout the world.And absorption refrigeration system canbe driven by using low-grade thermal energy(such as boiler exhaust gas,geothermalenergy,solar energy and other renewable energy,etc.),and no damage to the atmosphere. Ithas the advantages of saving energy and environment protection by using the naturalrefrigerant as working pair.To use environmental protection refrigerants CO2in absorptionrefrigeration has great economic and social benefits.A part of the ionic liquid combinedwith carbon dioxide can form working pair for absorption refrigeration.This new workingpair,as well as refrigerant thermodynamic phase equilibrium data,is indispensable forthermodynamic performance calculation, and the analysis of system power cycle,optimizethe structure of system,improving efficiency,etc.So far,the data of carbon dioxide and ionic liquid phase equilibrium is very few,especially in high pressure condition.It produces considerable errors that PR equationcombined with van der Waals mixing rules applied in polar system. A large number ofcalculations suggest that Wong-Sandler (WS) type mixing rules combined with two typeparameter cubic equation of state (EOS) is suitable for high pressure and lowpressure,phase equilibrium calculation of polar and nonpolar system, It shows goodtemperature and high pressure extrapolation which predicts for phase equilibriumcalculation of high temperature and high pressure by the low pressure vapor liquidequilibrium data of activity coefficient model parameters activity coefficient modelparameter.Schilderman accurately study the CO2-ionic liquid1-ethyl-3-methyl imidazole doublethree fluorine methanesulfonyl imide salt [emim][Tf2N] mixed working pair vapor liquidequilibrium data by the experiment in Delft university of technology. Based on the vaporliquid equilibrium experiment datas of CO2and [emim][Tf2N] of papers.Studying on thermodynamic performance of working pair CO2and [emim][Tf2N] with the Peng-Robinson, equation of state and Wong-Sandler rules associated with NRTL activitycoefficient model.It applies for temperature in313.15~453.15K and pressure0.639~14.770MPa.It can offer a theoretical basis for system design and the componentoptimization.