7. As part of the heat loss calculation for a "Tuff-Shed" storage facility, it is necessary to determine the U-factor fo

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7 As Part Of The Heat Loss Calculation For A Tuff Shed Storage Facility It Is Necessary To Determine The U Factor Fo 1 (50.46 KiB) Viewed 17 times

7. As part of the heat loss calculation for a "Tuff-Shed" storage facility, it is necessary to determine the U-factor for the wall shown 4 in brick 2 in polyurethane -5/8 in Opsum The indoor convection resistance is Ri=0.68 hr-ft? °F/BTU, the outdoor convection resistance is Ro = 0.17 hr-ft-"F/BTU. The brick has resistance per unit length of R' =R/t=0.10 hr-ft-F/BTU-inch, the polyurethane has R' =R/t=6.0 hr-ft- F/BTU-inch and the gypsum sheet rock board has R' =R/t=0.90 hr-ft-"F/BTU-inch The overall heat transfer coefficient, U (BTU/hr-ft-°F) for the wall is most nearly equal to: a. 0.072 b. 0.077 C. 0.13 d. 12 ~5 8. An HVAC system is to be installed in a 12,000 ft research lab serving 85 people. The HVAC system provides 17,000 CFM of total air space. The minimum quantity (CFM) of outside air permissible under ASHRAE Standard 62 "Ventilation Rate Procedure" is most nearly equal to: A 1,300 B. 1,800 C.2,600 D.17,000