Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Chapter 6, Problem 6.2P
Select an indoor design relative humidity for structures located in the cities given below. Assume an indoor design dry bulb temperature of 72 F. Windows in the building are double glass, aluminum frame with thermal break. Other external surface are well insulated.
- Caribou, ME
- Cleveland, OH
- Denver, CO
- Denver, CO
- San Franciso, CA
- Bismarek, ND
- Boise, ID
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motor supplies 200 kW at 6 Hz to flange A of the shaft shown in Figure. Gear B transfers 125 W of power to operating machinery in the factory, and the remaining power in the shaft is mansferred by gear D. Shafts (1) and (2) are solid aluminum (G = 28 GPa) shafts that have the same diameter and an allowable shear stress of t= 40 MPa. Shaft (3) is a solid steel (G = 80 GPa) shaft with an allowable shear stress of t = 55 MPa. Determine:
a) the minimum permissible diameter for aluminum shafts (1) and (2)
b) the minimum permissible diameter for steel shaft (3).
c) the rotation angle of gear D with respect to flange A if the shafts have the minimum permissible diameters as determined in (a) and (b).
Chapter 6 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
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