[Daily Question] Theoretical Basis 2021.03.22
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Multiple choice questions: The question is shown in the picture ( ) Answer: D Tip: Those who can explain the problem-solving process will be given additional rewards, and the answers can be seen in the replies.
D. When the temperature difference is zero, infinite amounts of heat and cold can be obtained
B. In the reverse Carnot cycle, the cooling coefficient of the refrigerator COP=Q2/(Q1-Q2)=T2/(T1-T2), and the heating coefficient of the heat pump ε′=Q1/(Q1-Q2)=T1/(T1-T2). Work and heat are not mutually inclusive. The energy grade of work is higher than that of heat, but this is not the reason why the energy efficiency of the reverse Carnot cycle is greater than 1. It can be seen from the calculation formula of cooling coefficient or heating coefficient that when the temperature difference is zero, its value will tend to infinity.