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 36, Problem 2RQ
What are the advantages of using refrigerated air-conditioning rather than evaporative conditioning?
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Q1: Determine the length, angle of contact, and width of a 9.75 mm thick
leather belt required to transmit 15 kW from a motor running at 900 r.p.m. The
diameter of the driving pulley of the motor is 300 mm. The driven pulley runs at
300 r.p.m. and the distance between the centers of two pulleys is 3 meters. The
density of the leather is 1000 kg/m³. The maximum allowable stress in the
leather is 2.5 MPa. The coefficient of friction between the leather and pulley is
0.3. Assume open belt drive.
5. A 15 kW and 1200 r.p.m. motor drives a compressor at 300 r.p.m. through a pair of spur gears having
20° stub teeth. The centre to centre distance between the shafts is 400 mm. The motor pinion is made
of forged steel having an allowable static stress as 210 MPa, while the gear is made of cast steel
having allowable static stress as 140 MPa. Assuming that the drive operates 8 to 10 hours per day
under light shock conditions, find from the standpoint of strength,
1. Module; 2. Face width and 3. Number of teeth and pitch circle diameter of each gear.
Check the gears thus designed from the consideration of wear. The surface endurance limit may be
taken as 700 MPa. [Ans. m = 6 mm; b= 60 mm; Tp=24; T=96; Dp = 144mm; DG = 576 mm]
4.
G
A micarta pinion rotating at 1200 r.p.m. is to transmit 1 kW to a cast iron gear at a speed of 192 r.p.m.
Assuming a starting overload of 20% and using 20° full depth involute teeth, determine the module,
number of teeth on the pinion and gear and face width. Take allowable static strength for micarta as 40
MPa and for cast iron as 53 MPa. Check the pair in wear.
Chapter 36 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 36 - True or False: Evaporative air-conditioning will...Ch. 36 - What are the advantages of using refrigerated...Ch. 36 - The four major components of an air-conditioning...Ch. 36 - Most compressors are cooled using the ___________.Ch. 36 - What advantage does a thermostatic expansion valve...Ch. 36 - What advantage does a capillary tube have over a...Ch. 36 - The ______expansion device ordinarily must use...Ch. 36 - The most popular refrigerant used in the past for...Ch. 36 - What are higher-efficiency refrigerant blends that...Ch. 36 - What refrigerant blend can be used in retrofit...
Ch. 36 - What types of heat are removed by the evaporator...Ch. 36 - The design boiling point for most evaporator coils...Ch. 36 - What are the three most common types of...Ch. 36 - The large interconnecting line between the indoor...Ch. 36 - The small interconnecting line between the indoor...Ch. 36 - The outside design temperatures in the summerin...Ch. 36 - The dew point temperature tells you how much...
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