A refrigerator operates on the vapor-compression cycle as follows (see Figure 5-13).

∎ The boiler produces saturated vapor at T = 285 K and P = 0.2 bar.

∎ The compressor has an efficiency of 70%.

∎ The condenser produces saturated liquid at T = 305 K and P = 0.9 bar.The refrigerant has  Both heatcapacity and enthalpy of vaporization can be assumed constant over the range of conditions in this process, and ideal gas behavior can be assumed at pressures below 1.0 bar. Estimate the coefficient of performance.

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4 1 Saturated liquid P = 0.9 bar T = 305 K Qμ Condenser Boiler 3 Ws,compressor m = 0.7 Saturated vapor P = 0.2 bar T = 285 K 2 ác FIGURE 5-13 Refrigeration cycle examined in Example 5-5.