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根据前人对有机Rankine循环和吸收式制冷循环的研究,本文选出了一组有潜力的吸收式动力循环工质R245fa+DMF。利用外循环可视汽液相平衡(VLE)测定装置,本文测定了温度293.15~353.15 K,压力15~700 kPa条件下R245fa+DMF体系的VLE数据。利用逸度系数法中的PR、SRK状态方程,活度系数法中的NRTL、Wilson模型,本文对体系的VLE数据进行了关联。偏差评价表明,NRTL模型能够较好描述该体系在实验温度压力下的VLE数据。从p-x图上可以看出,该体系呈现对Raoult定律较强的负偏差,显示R245fa和DMF具有很好的亲和性。因此,R245fa+DMF的组合具有成为吸收式动力循环工质对的潜力。
According to the previous research on organic Rankine cycle and absorption refrigeration cycle, a group of potential absorption cycle power refrigerant R245fa + DMF was selected. VLE data of R245fa + DMF system with temperature of 293.15 ~ 353.15 K and pressure of 15 ~ 700 kPa were measured using external circulation visual VLE apparatus. Using the PR, SRK equation of state in the fugacity coefficient method, NRTL and Wilson model in the activity coefficient method, the VLE data of the system are correlated in this paper. The bias evaluation shows that the NRTL model can describe the VLE data of the system under the experimental temperature pressure well. It can be seen from the p-x diagram that the system exhibits a strong negative bias to the Raoult’s law, indicating that R245fa and DMF have good affinity. Therefore, the combination of R245fa + DMF has the potential to become an absorption-type power cycle refrigerant.