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HEATING VENTILATING AIR CONDITIONING GUIDE 1943 . Table 3. Heat Loss Calculation Sheet for Uninsulated Residence (Fig. 2) A B C DE F G Roou ob Space Past op Structure Net Abba ob Coeffi Temp. Heat Loss Totau Crack Length cient Dipt.* (Btu per hour) (Btu per hour) Walls Glass Infiltration Ceiling*1 238 sq ft 4U sq ft 36 lin ftb ,242 sq.ft ` 0.28 0.45 0.35= 0,69 80 80 80 39.8 Bedroom B and Closet Walls Glass Infiltration Ceiling*1 156 sq ft 40 sq ft 36 lin fte 160 sq ft 0.28 0.45 0.35 0.69 80 80 80 39.8 Walls Glass Infiltration Ceiling*1 114 sq ft 27 sq ft 18 lin ft? 120 sq ft 0.28 80 0.45 80 0.35 80 0.69 .39.8 Walls Glass Infiltration Ceiling*1 Floor over Garage. 118 sq ft 20 sq ft 18 lin ft 120 sq ft 110 sq ft 0.28 0.45 0.35 0.69 0.25. 80 80 80 39.8 C35s- Walls. Glass Infiltration Ceiling*1 30 sq ft-. 14 sq ft 18 lin ft 55 sq ft 0.28 0.45 0.35 0.69 80 80 80 39.8 Bathroom 2. Walls Glass Infiltration . Ceiling*1 Floor over Garage- . 79 sq ft 9 sq ft 15 lin ft . 35 sq ft 35 sq ft 0.26 0.45 0.35 0.69 0.25 80 80 80 39.8 35 Living Room Walls Walls (adjoining garage) Glass Infiltration 267 sq ft 94 sq ft 50 sq ft 40 lin ft 0.28 80 0.39h 35 0.45 80 ` 0:35 '80- Dining Room WallsGlass (doors) Glass (window) Infiltration* 166 sq ft. 35 sq ft 20 sq ft 31 lin ft 0.28 1.13 0.45 0.35 80 80 80 80 Kitchen and Entrance to Garage Walls (outside) Walls (adjoining garage) Infiltration Glass Door to garage 96.sq ft 51.sq ft 27 lin ft 18 sq ft . 17 sq ft 0.28 0.39h 0135 0.45 .0.51 80 35 80 80 35 Walls (outside) Walls (adjoining garage) Door . Glass Infiltration 82 sq ft ` 85 sq ft 19 sq ft. . 9 sq ft 19 lin ft 0.28 0:39h 0.51 0.45 0.35 80 35 80 80 80 5330 1440 1010 6660 3490 1440 1010 4400 2560 970. 500 3300 2650 720 500 3300 960" 670 500 500 1510 1770 . 320 420 960 . 310" 5980 1280" 1800 1120 3720 3160 720 870 . 2150 700" 760 650 300" 1840 .1160" 780 320 530 14,440 10,340 7,330 8,130 3,180 3,780 10,180 8,470 4,560 4,630 . 142 r- i* I ;CHAPTER 6. HEATING LOAD Table 3. Heat Loss Calculation Sheet for Uninsulated Residence (Fig. 2) (Concluded) A B C D E` F G Room ob Space Crack Length CIENT Tehp. ' Heat Loss Totals Dipt. (Btu per hour) (Btu per hour) Entrance Hall Garage Recreation Room" Total Walls Door 'Infiltration Ceiling*1* p Walls Glass Doors Infiltration Floor (heat gain) Heat gain Floor Walls . Glass Infiltration 39 sq ft 21 sq ft 20 lin ft 87 sq ft 167 sq ft 53 sq ft 44 sq ft 37 lin ft 185 sq ft 287 sq ft 220 sq ft 8 sq ft S lin ft 0.28 0.38 0.35 0.69 80 870 80 640 80 560 39.8 . . 2490 0.28 45 1.13 45 0.51 45 l'.62 45 0.10k --15k 2110 2700 1010 2700 -280 -4710" 0.10 0.10 1.13 0.76 20 38 80 80 . 570 840 720 490 4,560; 3,530 2,620 85,750 The inside-outside temperature difference is 70 -- (--10) or 80 F, except where otherwise noted. bOnly the south windows are used for arriving at the window crack for this room, on the assumption that whatever air enters through the south window cracks will leave through the west window cracks or elsewhere. Double-hung wood windows with storm sash are assumed to have the same leakage per foot of crack as weatherstripped windows. The air leakage per foot of crack is about 19;5 cu ft per foot of crack for a wind velocity of 12.5 mph. (See Table 2,- Chapter 5.) The heat equivalent of the air leakage per hour per degree temperature difference' per foot of crack is obtained by multiplying this value by 0.018. or 19.5 X 0.018 - 0.35. din this problem the ceiling heat losses are calculated by estimating the attic temperature anda then /`alrnlftring the loss through the ceiling using the proper temperature difference. This unheated attic is not ventilated during the winter months. The attic temperature is estimated from Equation 4 to be 30.2 F when the outside temperature is --10 F and the room temperature Is 70 F. The temperature difference is therefore 70 -- 30.2 or 39.8 F. The' window-crack in the west wall having two windows is used. COne-half the total crack is used in these rooms. ^Temperature in garage assumed to be 35 F.,. hCoefficient for wall adjoining garage calculated on basis of metal lath and plaster on both sides of studs. (U - 0.39.) iThe door crack Is used for estimating the infiltration in this room and as the French doors are weatherstripped the infiltration coefficient is assumed to be the same as in Note b. ' iThe leakage for the garage doors is assumed to be twice that for poorly-fitted double-hun^ wood windows or about 90 cu ft per foot of crack for a wind velocity of 12.5 mph. The infiltration coefficient is therefore 0.018 X 90 or 1.62. kThe ground temperature is assumed to be 50 F and, as the garage temperature is 35 F, the beat transfer will be from the ground to the garage, and thislheat gain should therefore be subtracted from the heat loss. mThe heat losses from various rooms into the garage are heat gains for the garage. nHeat is to be provided for the recreation room and this space is therefore figured on the basis of a 70 F temperature. Heat loss into the basement from recreation room is.neglected, the calculations being based only on losses through the outside walls, glass and floor. pThe upstairs ball ceiling is included with the downstairs entrance hall because these are connected by means of the stairway. The beat should be provided downstairs. 143