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Helium has the lowest normal boiling point of any of the
Chapter 5, Problem 64HP(choose chapter or problem)
Problem 64HP
Helium has the lowest normal boiling point of any of the elements at 4.2 K. At this temperature the enthalpy of evaporation is 83.3 kJ/kmol. A Carnot refrigeration cycle is analyzed for the production of 1 kmol of liquid helium at 4.2 K from saturated vapor at the same temperature. What is the work input to the refrigerator and the COP for the cycle with an ambient at 300 K?
Questions & Answers
QUESTION:
Problem 64HP
Helium has the lowest normal boiling point of any of the elements at 4.2 K. At this temperature the enthalpy of evaporation is 83.3 kJ/kmol. A Carnot refrigeration cycle is analyzed for the production of 1 kmol of liquid helium at 4.2 K from saturated vapor at the same temperature. What is the work input to the refrigerator and the COP for the cycle with an ambient at 300 K?
ANSWER:
Solution 64 HP
Step 1 of 5:
In this question, we need to find work input to the refrigerator and coefficient of performance for the cycle
Data given
Lowest boiling point
Enthalpy of evaporation
Amount of liquid helium produced
Ambient temperature