A ship's boiler steam comes out at 112 C and pushes through the system, exiting into the condenser, which is kept at 20 C by circulating seawater. What is the ideal efficiency of the ship's boiler? Round to

the nearest thousandth.

O 0.643

O 0.523

O 0.703

O 0.239

D: 0.239

Explanation:

Equation for ideal efficiency is;

η = 1 - (T_c/T_h)

We are told that;

steam comes out at 112° C. Thus, T_h = 112°C. Converting to Kelvin gives; T_h = 112 + 273 = 385 K

The one exiting into the condenser is kept at 20°C. Thus; T_c = 20 + 273 = 293 K

Thus;

η = 1 - (293/385)

η = 0.239

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