PROBLEM #4: A piston cylinder device contains an ideal gas changed with an initial condition of 120 kPa and a volume of 11.5 m. Final conditions for the gas should be 1320 kPa and 0.85 m?. This can be done by performing any of the following processes, a. Isothermal compression b. Adiabatic compression then isobaric cooling c. Adiabatic compression then isochoric cooling For each of the reversible processes, calculate Q, W. AU and AH.

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter45: Domestic Refrigerators And Freezers
Section: Chapter Questions
Problem 8RQ: Frost accumulates on the evaporators of forced-draft refrigerators because A. they are generally...
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Assume ethanol behaves like water.
Cooling
Cooling
water
water
(sat'd liquid)
T2 = 60°C
Pi = P2
(sat'd liquid)
Ti = 20°C
P2 15 000 Pa
Vapor
Pi = 15 000 Pa
Xv = 0.84
T2 = 40°C
PROBLEM #4:
A piston cylinder device contains an ideal gas changed with an initial condition of 120 kPa
and a volume of 11.5 m. Final conditions for the gas should be 1320 kPa and 0.85 m2. This
can be done by performing any of the following processes,
a. Isothermal compression
b. Adiabatic compression then isobaric cooling
c. Adiabatic compression then isochoric cooling
For each of the reversible processes, calculate Q, W. AU and AH.
Transcribed Image Text:Assume ethanol behaves like water. Cooling Cooling water water (sat'd liquid) T2 = 60°C Pi = P2 (sat'd liquid) Ti = 20°C P2 15 000 Pa Vapor Pi = 15 000 Pa Xv = 0.84 T2 = 40°C PROBLEM #4: A piston cylinder device contains an ideal gas changed with an initial condition of 120 kPa and a volume of 11.5 m. Final conditions for the gas should be 1320 kPa and 0.85 m2. This can be done by performing any of the following processes, a. Isothermal compression b. Adiabatic compression then isobaric cooling c. Adiabatic compression then isochoric cooling For each of the reversible processes, calculate Q, W. AU and AH.
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