14 ft 4ft U BTU/hr-ft²-F Office plan view 12 ft double-hung Wall 0.10 window 5 ft H x 4 ft W Window 0.60 Roof 0.08 (a) (

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14 Ft 4ft U Btu Hr Ft F Office Plan View 12 Ft Double Hung Wall 0 10 Window 5 Ft H X 4 Ft W Window 0 60 Roof 0 08 A 1 (167.35 KiB) Viewed 13 times

14 ft 4ft U BTU/hr-ft²-F Office plan view 12 ft double-hung Wall 0.10 window 5 ft H x 4 ft W Window 0.60 Roof 0.08 (a) (b) (c) An office plan view is shown in the above Figure (a); the double -hung type window size is shown in the above Figure (b); The U-value for the wall, window and roof are listed in the above Figure (c). The wall has an area of 106 ft². To maintain indoor room temperature at 75F from the outdoor air of 35F, heat will be supplied to the space. If only sensible heat (of wall, window, roof) and infiltration through window cracks are considered, what is the required heating load in the unit of Btu/hr? Given air specific heat Cp = 0.24 Btu/lbm · F; air density p = 0.076 lbma/ft³ and infiltration rate for the window cracks is 0.5 cfm /ft. (20 marks) W 5ft H