A crude but effective approach to estimate steam leak (in lb/hr) from an orifice is to use
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A crude but effective approach to estimate steam leak (in lb/hr) from an orifice is to use the following expression:
Estimate the hourly, monthly, and annual costs of steam leaks from a 300-psig pipe. The steam is generated from a gas boiler with an efficiency of 80 percent. The cost of natural gas is $0.90/therm (1 therm is equivalent to 100,000 Btu/hr). The heating season spans seven months per year. Provide the costs for the following orifice diameters: 1/16; 1/8; 1/4; 3/8; 1/2; and 1 in.
Transcribed Image Text:
lb/hr= C k At-A-P0.97 where Ca the coefficient of discharge (for a perfectly round orifice, C = 1. In most cases, C = 0.7). k = a constant (k = 0.0165). At = the number of seconds in 1 hour (At = 3,600). A = the area of the orifice (in in.). P = the pressure inside the steam pipe (in psia).
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To estimate the steam leak in pounds per hour lbhr from an orifice we can use the formula provided lbhr Cd cdot k cdot Delta t cdot A cdot Pi097 where Cd is the coefficient of discharge usually 07 unl...View the full answer
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Energy Audit Of Building Systems An Engineering Approach
ISBN: 9780367820466
3rd Edition
Authors: Moncef Krarti
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