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 37, Problem 17RQ
Multiple-zone systems often use a(n) __________or a(n)___________to alleviate the problem of excess air when only some zones are calling for conditioning.
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a) Explain four factors in determining the comfort level for an air conditioning room.Suggest the typical value for those factors.
Questions:
1) The cooling tower is a part of:
a. Air cooled refrigeration system.
b. Water cooled refrigeration system-
C. Low capacity refrigeration system.
2) The closed type cooling tower need pumping system less head than open type because:
a. The water loop is short.
b. The water loop is dosed.
c. The loop is open.
3) The air wet bulb temperature effect on the perftormance of cooling tower in:
a. Range
b. Арproach.
C. Both.
4) The centrifugal cooling tower is:
a. Induced draft type.
b. Blow through type.
c. Draw through type.
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
Chapter 37 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 37 - Name five changes that are made to air to...Ch. 37 - The two ways that fresh air enters a structure are...Ch. 37 - Which of the following types of fan is used to...Ch. 37 - True or False: Turbulence in airflow causes...Ch. 37 - Name two types of blower drives.Ch. 37 - Pressure in ductwork is expressed in which of the...Ch. 37 - What is a common instrument used to measure...Ch. 37 - Prob. 8RQCh. 37 - Name the two types of return-air systems in...Ch. 37 - What is the component that distributes air in the...
Ch. 37 - Warm air heats a room better if distributed A. low...Ch. 37 - Name four materials used to manufacture duct.Ch. 37 - The name of the fitting where the branch line...Ch. 37 - Prob. 14RQCh. 37 - Prob. 15RQCh. 37 - Prob. 16RQCh. 37 - Multiple-zone systems often use a(n) __________or...Ch. 37 - Prob. 18RQCh. 37 - Prob. 19RQCh. 37 - Prob. 20RQCh. 37 - If a rectangular duct system s (12in.26in.) has an...Ch. 37 - The equivalent feet of pressure drop for a group...
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- (c) Explain the lay out and the basic operation of a centralized air conditioning system (or chiller system).arrow_forwardWhich component is primarily responsible for the pressure in a cooling system? Select one: a. The thermostat b. The water pump c. The radiator cap d. The surge tankarrow_forwardWhat would operating an engine with 100% water in the cooling system cause? Select one: a. Corrosion of the metal parts in the cooling system b. Premature hose deterioration c. Engine overheating d. Loss of heat in the passenger compartmentarrow_forward
- c) Explain the layout and the basic operation of a centralized air conditioning system(or chiller system).arrow_forward1. (a) List out the classification of air-conditioning system. (b) With the aid of following sketch diagram(s) Fig.1, explain the working principle and details of the loops involved in the centralized HVAC building system. . Fresh Air Necessary considering IAQ Water 12°C 137°C Water Return Air 24°C Pump Air-handling Supply Unit Air Chiller Fan 7°C Cooling Tower 14°C Produce chilled water (7°C) 32°C Supply Air Pump Heat Gain or 24°C Return Air Heat Gain Room Chiller Fan Air cool chiller Heat rejected to the environment Fig.1 Systematic diagram of an air-conditioning systemarrow_forwardWhat happens if the evaporator fan motor do in a refrigerator stops during the cooling cycle? Select the correct answer: A. the uni maintains 35 to 45 degrees B. the unit temperature falls below 32 degrees C. th unit shuts down D. the evaporator freezes over and the temperature risesarrow_forward
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