3013-11 Hw-1

# 3013-11 Hw-1 - CHE 3013 Rate Operations I Fall 2011...

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1 of 3 CHE 3013 Rate Operations I Fall 2011 Homework 1 Due: Wednesday, August 31, 2011 6 Problems, 18 points total 1. (3 points) Using defined constants and conversion factors, determine the magnitude of the right hand side of the following expressions. Show all work (no sketch is necessary). (a) 50 barg = _____psia (b) 750 W/(m 2 K) = ____ Btu/(hr ft 2 ° F) (c) 1.50 cP = ____ lb m /(ft s) (d) 7.5 psi = _____ in H 2 O differential pressure (Reference temperature = 60 ° F) (e) 25 hp = ____kW (f) 10,000 Btu/hr = ____hp 2. (3 points) (a) A nitrogen purge is commonly used to pad (blanket) the vapor space in tanks used to store liquid hydrocarbons to prevent the formation of flammable mixtures. Estimate the daily consumption of nitrogen in SCF for a tank with a purge rate of 1.0 lb m /hr. Note: Standard conditions are 60 ° F and 14.696 psia. (b) A 50 hp electric motor operates at 65 percent of rated capacity. What is the hourly cost of electricity at 7.5 cents per kW-hr? (c) Air at 75 ° F and 0.5 psig flows through a 24 inch x 30 inch rectangular duct at a rate of 125 lb m /hr. What is the average velocity of the air in ft/min?

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