Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 40, Problem 10RQ
The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.
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34. Four designs for a steam power plant are shown in the figure. a) Find the heat
supplied, the heat rejected, the net work, and the cycle thermodynamic efficiency
for each design. b) Compare the results and comment on the advantage of each
design.
T
540 F
540 F
900 F
b
540 F
540 F
b.
Cycle A
Cycle i
Cyclec
Cycle D
90 F
90 F
90 F
90 F
d
d
d
Octane is used as the working fluid in a gas-flow refrigeration cycle. The pressure ratio of the system is 5 and the octane enters the compressor at -15 oC.
Fluid temperature at turbine inlet
It is 70 oC. By accepting the adiabatic efficiency of the compressor and turbine as 80%;
a) the flow diagram of the cycle, T-s diagram of the cycle,
b) turbine inlet temperature,
c) the efficiency coefficient of the cycle,
d) find the highest and lowest temperatures of the cycle and e) find the required amount of fluid for 10 kW cooling load.
36. Steam enters a turbine with an enthalpy of 1292Btu/lb and leaves with an enthalpy of 1098
Btu/lb. The transferred heat is 13 Btu/lb. what is the work in hp for a flow of 2 lb/sec?
a. 1,280.1636hp
b. 1,350.8909hp
c. 1,315.5273hp
d. 512.0655hp
Chapter 40 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 40 - The standard design conditions for...Ch. 40 - The typical temperature relationship between a...Ch. 40 - The evaporator will normally operate at a(n)...Ch. 40 - A typical temperature relationship between a...Ch. 40 - How is condenser high efficiency obtained?Ch. 40 - High-efficiency air-conditioning systems may use...Ch. 40 - What does the head pressure do If the suction...Ch. 40 - What will cause the suction pressure to rise?Ch. 40 - The evaporator design temperature may in some...Ch. 40 - The seasonal energy efficiency ratio (SEER)...
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