Answer
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Work Step by Step
Allowing a temperature difference of $10^{\circ} \mathrm{C}$ for effective heat transfer, the evaporation and condensation temperatures of the refrigerant should be $-20^{\circ} \mathrm{C}$ and $35^{\circ} \mathrm{C}$, respectively. The saturation pressures corresponding to these temperatures are $0.133 \mathrm{MPa}$ and $0.888 \mathrm{MPa}$. Therefore, the recommended evaporator and condenser pressures are $\mathbf{0 . 1 3 3}$ $\mathrm{MPa}$ and $0.888\ \mathrm{MPa}$, respectively.
