The working body of the machine, having received the amount of heat Q1 from the heater, is equal to 4.2 kilojoules

The working body of the machine, having received the amount of heat Q1 from the heater, is equal to 4.2 kilojoules, did the work of 590 joules, find the efficiencies of the cycle and the amount of heat transferred to the refrigerator

These tasks: Q1 (heat received by the working fluid of the used machine from the heater; consumed heat) = 4.2 kJ (4200 J); Q2 (perfect work) = 590 J.

1) Cycle efficiency: η = Q2 / Q1 = 590/4200 = 0.14 or 14%.

2) Heat transferred to the refrigerator: Qx = Q1 – Q2 = 4200 – 590 = 3610 J.

Answer: The efficiency of the cycle is 14%; the refrigerator was transferred 3610 J of heat.