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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Textbook Question
Chapter 42, Problem 9RQ
If an air-conditioning system was being designed for usein Nogales, Arizona, what temperature difference would be used for calculations?
A. 21°F
B. 68°F
C. 75°F
D. 96°F
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QUESTION 1
A 120-ton capacity chiller, based on a refrigeration cycle, is used to maintain a coolant temperature of 35 deg. F. The chiller
exchanges heat to the surrounding air at 70 deg. F. This unit utilizes a 150 hp motor. What is the rate of heat removal from the
coolant, in Btu/hr?
O1,440,000
O 381,675
O 1,821,675
O 120
QUESTION 2
A powerplant operates between a furnace at 990 deg. Fand cooling water delivered from a nearby river at 70 deg. F. What is the
maximum possible efficiency of this powerplant, in %?
Oa. 72.8%
Ob. 27.2%
Oc 92.9%
Od.63.4%
QUESTION 3
If fuel oil is supplied to a power plant furnace at a rate of 60,000 gallons/hr, and the oil has a heating value of 150,000 Btu/gallon,
and the plant has a thermal efficiency of 30%, what is the power output of this plant (in MW)?
Oa. 2637.6
Ob.9000
Oc 2700
d. 791.3
What is the total length of this furnace and air-conditioning system?
A domestic refrigerator sits in a kitchen, switched on, with the refrigerator door wide open.
The kitchen itself is well insulated and it can be assumed no heat can escape or enter the kitchen from the outside.
Which of the following is the most accurate statement.
a. The temperature in the kitchen will go down very slightly.
O b. The temperature in the kitchen could go up or down, depending on the Coefficient of Performance (COP) of the
refrigerator.
O c.
The temperature in the kitchen could go up or down depending on the mechanical efficiency of the compressor.
O d. The temperature in the kitchen will stay the same.
O e.
The temperature in the kitchen will go up very slightly.
Chapter 42 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 42 - An oversized air-conditioning system will A. cost...Ch. 42 - Methods used to calculate the heat gain and heat...Ch. 42 - An exterior wall A. separates a conditioned...Ch. 42 - A partition wall A. separates a conditioned...Ch. 42 - As the temperature differential across a panel...Ch. 42 - The typical indoor design temperature used for...Ch. 42 - The typical indoor design temperature used for...Ch. 42 - If a heating system was being designed for use in...Ch. 42 - If an air-conditioning system was being designed...Ch. 42 - If the R-value of a construction material is 2.0,...
Ch. 42 - If a wall is made up of four different materials,...Ch. 42 - Prob. 12RQCh. 42 - All of the following are taken into account on a...Ch. 42 - How much heat is lost through a 3' 5' single-pane...Ch. 42 - Which of the following is(are) true regarding a...Ch. 42 - Which of the following is(are) true regarding the...
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