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Problem 1: The dimensions of a warehouse are area A = 100,000 ft?, height h = 30 ft. Assume that the warehouse is perfectly insulated so there is no heat exchange with the outside. The starting temperature of the warehouse is 50 °F, and the desired temperature is 70 °F. The pressure at the starting temperature is p, = 14.7 psia. Assume the air behaves like ideal gas for the following calculations. a) Calculate the mass of air inside the warehouse at the starting temperature in pound-moles (Ibmol), gram-moles (gmol), pound-mass (Ibm) and kg b) Calculate the heat required in both kJ and BTU to heat the air inside the warehouse from the starting temperature to the desired temperature, using a constant heat capacity cp = 29 J/gmol.K. c) If the heating value of natural gas is H, = 1000 BTU/SCF, calculate the natural gas required in SCF to provide the heat in b)

Problem 1: The dimensions of a warehouse are area A = 100,000 ft?, height h = 30 ft. Assume that the warehouse is perfectly insulated so there is no heat exchange with the outside. The starting temperature of the warehouse is 50 °F, and the desired temperature is 70 °F. The pressure at the starting temperature is p, = 14.7 psia. Assume the air behaves like ideal gas for the following calculations. a) Calculate the mass of air inside the warehouse at the starting temperature in pound-moles (Ibmol), gram-moles (gmol), pound-mass (Ibm) and kg b) Calculate the heat required in both kJ and BTU to heat the air inside the warehouse from the starting temperature to the desired temperature, using a constant heat capacity cp = 29 J/gmol.K. c) If the heating value of natural gas is H, = 1000 BTU/SCF, calculate the natural gas required in SCF to provide the heat in b)

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Problem 1: The dimensions of a warehouse are area A = 100,000 ft?, height h = 30 ft. Assume that the warehouse is perfectly insulated so there is no heat exchange with the outside. The starting temperature of the warehouse is 50 °F, and the desired temperature is 70 °F. The pressure at the starting temperature is p, = 14.7 psia. Assume the air behaves like ideal gas for the following calculations. a) Calculate the mass of air inside the warehouse at the starting temperature in pound-moles (Ibmol), gram-moles (gmol), pound-mass (Ibm) and kg b) Calculate the heat required in both kJ and BTU to heat the air inside the warehouse from the starting temperature to the desired temperature, using a constant heat capacity c, = 29 J/gmol.K. c) If the heating value of natural gas is H, = 1000 BTU/SCF, calculate the natural gas required in SCF to provide the heat in b)
Transcribed Image Text:Problem 1: The dimensions of a warehouse are area A = 100,000 ft?, height h = 30 ft. Assume that the warehouse is perfectly insulated so there is no heat exchange with the outside. The starting temperature of the warehouse is 50 °F, and the desired temperature is 70 °F. The pressure at the starting temperature is p, = 14.7 psia. Assume the air behaves like ideal gas for the following calculations. a) Calculate the mass of air inside the warehouse at the starting temperature in pound-moles (Ibmol), gram-moles (gmol), pound-mass (Ibm) and kg b) Calculate the heat required in both kJ and BTU to heat the air inside the warehouse from the starting temperature to the desired temperature, using a constant heat capacity c, = 29 J/gmol.K. c) If the heating value of natural gas is H, = 1000 BTU/SCF, calculate the natural gas required in SCF to provide the heat in b)
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