Suppose that heat leaks into your kitchen refrigerator at an average rate of 300 watts. Assuming ideal operation, how much power must it draw from the wall?
The power drawn from wall is 57.69 W.
Assume temperatures T1 = 250 K and T2 = 298 KPower leak = 300 W
COP can be found by using
Substitute the values
The amount of power drawn from the wall is:
Table 4.5 gives experimental values of the molar enthalpy of nitrogen at 1 bar and 100 bars. Use this data to answer the following questions about a nitrogen throttling process operating between these two pressures.
(a) If the initial temperature is , what is the final temperature? (Hint: You'll have to do an interpolation between the tabulated values.)
(b) If the initial temperature is , what is the final temperature?
(c) If the initial temperature is , what is the final temperature? What fraction of the nitrogen ends up as a liquid in this case?
(d) What is the highest initial temperature at which some liquefaction takes place?
(e) What would happen if the initial temperature were ? Explain.
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