Document QJwj9v9XBB9NL6Yb1r4YaL9v4

-7??V HEATINC VENTILATING AIR CONDITIONING GUIDE 1940 Table 3. Heat Loss Calculation Sheet for Uninsulated Residence (Fig. 1) A B c DE F G Room ob Space Past op Structure Net Area or Crack Length Coeffi cient Temp. Heat Loss TOTALS DifF.a (Btu per hour) (Btu per hour) Bedroom A Walls Glass Infiltration Ceiling*1 238 sq ft 40 sq ft 36 lin ft*> 242 sq ft Bedroom B and Closet Walls Glass Infiltration Ceiling*1 156 sq ft 40 sq ft 36 lin fte 160 sq ft Bedroom C Walls Glass Infiltration Ceiling*1 114 sq ft 27 sq ft 18 lin ftf 120 sq ft Bedroom D and Closet Walls Glass Infiltration Ceiling1* Floor over Garage 118 sq ft 20 sq ft . 18 lin ft 120 sq ft 110 sq ft Bathroom 1 Walls Glass Infiltration Ceiling*1 30 sq ft 14 sq ft 18 lin ft 55 sq ft Bathroom 2 Walls Glass Infiltration Ceiling*1 Floor over Garage 79 sq ft 9 sq ft. 151 lin ft 35 sq ft 35 sq ft Living Room Walls Walls (adjoining garage) Glass Infiltration 267 sq ft 94 sq ft 50 sq ft 40 lin ft Dining Room Walls Glass (doors) Glass (window) Infiltration* 166 sq ft 35 sq ft 20 sq ft 31 tin ft Kitchen and Entrance to Garage Walls (outside) Walls (adjoining garage) Infiltration Glass Door to garage 96 sq ft 51 sq ft 27 sq ft 18 lin ft 17 sq ft Lavette and Vestibule 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 0.45 0.35c 0.69 80 80 80 39.8 0.28 0.45 0.35 0.69 80 80 80 39.8 0.28 0.45 0.35 0.69 80 80 80 39.8 0.28 0.45 0.35 0.69 0.25 80 80 80 39.8 35S 0.28 0.45 0.35 0.69 80 80 80 39.8 0.26 0.45 0.35 0.69 0.25- 80 80 80 39.8 35 0.28 0.39*1 0.45 0.35 80 35 80 80 0.28 1.13 0.45 0.35 80 80 80 80 0.28 0.39h 0.35 0.45 0.51 80 35 80 80 35 0.28 0.39*1 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 960m 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 4,630 138 CHAPTER 7. HEATING LOAD Table 3. Heat Loss Calculation Sheet for Uninsulated Residence (Fig. 1) (Concluded) A Room or Space B Part of Structure C DE F G Net Abba or Crack Length Coeffi cient Temp. Dip.* Heat Loss Totals (Btu per hour) (Btu per hour) Entrance Hall Walls Door Infiltration Ceiling*1' P Garage Walls Glass Doors Infiltration Floor (heat gain) Heat gain Recreation11 Room Floor Walls Glass Infiltration Total 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 8 lin ft 0.28 0.38 0.35 0.69 80 80 80 39.8 870 640 560 2490 0.28 45 1.13 45 0.51 45 1.621 45 0.64k -10k 2110 2700 1010 2700 -1180 -4710" 0.64 0.70 1.13 0.76 25 25 80 80 . 4600 3850 720 490 4,560 2,630 9,660 91,890 The inside-outside temperature difference is 70 - (-10) or 80 F, except where otherwise noted. hOnly 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 weatherstnpped 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 6.) The heat equivalent of the air leakage per hour per 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 and then calculating the loss through the ceiling using the proper temperature difference. This unheated attic is not ventilated dunng the winter months. The attic temperature is estimated from Equation 1 to be 30.2 F thwefore 7013 "' ^ and the room temperature is 70 F. The temperature difference is The window crack in.the west wall having two windows is used. fOne-half the total crack is used in these rooms. ^Temperature in garage assumed to be 35 F. studs'^U^'o 39F)Wa11 ad^oining garage calculated on basis of metal lath and plaster on both sides of `The door crack is used for estimating the infiltration in this room and as the French doors are weather stnpped the infiltration coefiicient is assumed to be the same as in Note b. jhe*tekag?/or th,e gara,ge do?rrs i9 assumed to be twice that for poorly-fitted double-hung wood windows 0 05128X"* 90 ocur 1Jt.6,,?2e. r foot of crack for a wind velocity of 12.5 mph. The infiltration coefficient is therefore kThe ground temperature is assumed to be 45 F and as the garage temperature is 35 F. the heat transfer Thi a from e-gr?u/r? to h,,e gara,ge- and this beat gain should therefore be subtracted from the heat loss. *. coeffiaent ((/ = 0.64) is based on 4 in. stone concrete and 3 in. cinder concrete. This coefficient snouiq probably be lower as the ground itself has some heat resistance value. However, complete data are not as yet available. "The heat losses from various rooms into the garage are heat gains for the garage. ^eat is to be provided for the recreation room and this space is therefore figured on the basis of a 70 F "njpcrature. Heat loss into the basement from recreation room is neglected, the calculations being based my on losses through the outside walls, glass and floor. Ground temperature assumed to be 45 F. _ upstairhall ceiling is included with the downstairs entrance Hall because these are connected by cans of the stairway. The heat should be provided downstairs. 139