按经典热力学,工作在两个恒温热源之间的逆卡诺循环的最大性能系数为或其中ε_r和ψ_r分别为制冷系数和供热系数,T_1和T_2分别为高温和低温热源的温度。(1)、(2)式给出的启示是:要达到理想的热力学界限,工质同热源间的传热温差应无穷小,循环必 According to classical thermodynamics, the maximum coefficient of performance of an inverse Carnot cycle operating between two thermostatic heat sources is or where ε_r and ψ_r are the cooling coefficient and the heat supply coefficient, respectively, and T_1 and T_2 are the temperatures of the high and low temperature heat sources, respectively. (1), (2) gives the enlightenment is: to reach the ideal thermodynamic limit, heat transfer medium and heat source temperature should be infinitely small, the cycle must