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Problem 3-5-Mass and energy balance in a control volume A house is maintained at 1 atm and 24°C. Outdoor air at 5.5°C infiltrates into the house through the cracks and warm air inside the house is forced to leave the house at a rate of 90 m³/hr. The gas constant of air is R = 0.287 kPa-m³/kg-K. The constant pressure specific heat of air at room temperature is cp = 1.005 kJ/kg-°C. Determine the mass flow rate of the warm air exiting the house (in kg/s). A. 0.03 kg/s B. 0.37 kg/s C. 1.8 kg/s D. 107 kg/s Determine the mass flow rate of the cold air entering the house (in kg/s). A. 0.03 kg/s B. 0.37 kg/s C. 1.8 kg/s D. 107 kg/s Determine the rate of net energy loss of the house due to mass transfer (in kW). A. 0.56 kW B. 6.9 kW C. 18.6 kW D. 560 kW

Problem 3-5-Mass and energy balance in a control volume A house is maintained at 1 atm and 24°C. Outdoor air at 5.5°C infiltrates into the house through the cracks and warm air inside the house is forced to leave the house at a rate of 90 m³/hr. The gas constant of air is R = 0.287 kPa-m³/kg-K. The constant pressure specific heat of air at room temperature is cp = 1.005 kJ/kg-°C. Determine the mass flow rate of the warm air exiting the house (in kg/s). A. 0.03 kg/s B. 0.37 kg/s C. 1.8 kg/s D. 107 kg/s Determine the mass flow rate of the cold air entering the house (in kg/s). A. 0.03 kg/s B. 0.37 kg/s C. 1.8 kg/s D. 107 kg/s Determine the rate of net energy loss of the house due to mass transfer (in kW). A. 0.56 kW B. 6.9 kW C. 18.6 kW D. 560 kW

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Problem 3-5-Mass and energy balance in a control volume A house is maintained at 1 atm and 24°C. Outdoor air at 5.5°C infiltrates into the house through the cracks and warm air inside the house is forced to leave the house at a rate of 90 m³/hr. The gas constant of air is R = 0.287 kPa-m³/kg-K. The constant pressure specific heat of air at room temperature is cp = 1.005 kJ/kg-°C. Determine the mass flow rate of the warm air exiting the house (in kg/s). A. 0.03 kg/s B. 0.37 kg/s C. 1.8 kg/s D. 107 kg/s Determine the mass flow rate of the cold air entering the house (in kg/s). A. 0.03 kg/s B. 0.37 kg/s C. 1.8 kg/s D. 107 kg/s Determine the rate of net energy loss of the house due to mass transfer (in kW). A. 0.56 kW B. 6.9 kW C. 18.6 kW D. 560 kW
Transcribed Image Text:Problem 3-5-Mass and energy balance in a control volume A house is maintained at 1 atm and 24°C. Outdoor air at 5.5°C infiltrates into the house through the cracks and warm air inside the house is forced to leave the house at a rate of 90 m³/hr. The gas constant of air is R = 0.287 kPa-m³/kg-K. The constant pressure specific heat of air at room temperature is cp = 1.005 kJ/kg-°C. Determine the mass flow rate of the warm air exiting the house (in kg/s). A. 0.03 kg/s B. 0.37 kg/s C. 1.8 kg/s D. 107 kg/s Determine the mass flow rate of the cold air entering the house (in kg/s). A. 0.03 kg/s B. 0.37 kg/s C. 1.8 kg/s D. 107 kg/s Determine the rate of net energy loss of the house due to mass transfer (in kW). A. 0.56 kW B. 6.9 kW C. 18.6 kW D. 560 kW
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