Document QgmgdzrbKZ0b1r1B0e891xqN7

132 Chapter 6 1945 Guide Table 4.--Heat-Loss-Calculation Sheet for-Uninsulated-Residence (Fig. 2) A B c DE F G Net Area or Coefpi- Temp.- Heat Loss Totals Crack Length CIENT Di?r.a (Btu per hour) (Btu per hour) Walk Glass Infiltration Ceiling^ ' 238 sq ft 0.28 80 5330 40 sq ft 0.45 80 1440 35 Im ttD 0.35c 80 1010 242 sq ft 0.69 39.8 6660 14,440 Bedroom B and (Jloset Walls Glass Infiltration Ceiling^ 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 3490 1440 1010 4400 10,340 Walls Glass Infiltration Ceiling*1 114 sq ft 27 kj ft . 18 lin It* 120 sq ft 0.28 0.45 0.35 0.69 80 80 80 39.8 2560 970 500 3300 7,330 Walls Glass Infiltration . Ceiling*1. F loor 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 39.8 358 2650 720 500 3300 960*** 8,130 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 39.8 670 500 500 1510 3,180. bathroom 2 Wails Glass Infiltration Ceiling*1 b loor 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 1770 320 420 960 310* 3,780 Living Room Walls Walls (adjoining garage) Glass Infiltration 267 sq ft 94 sq ft 50 sq ft 40 lin ft 0.28 80 0.391* 35 0.45 80 0.35 80 Dining Room Walls Glass (doors) Glass (window) Infiltration* 166 sq ft . 35 sq ft 20 sq ft 31 Hn 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 0.35 0.45 0.51 80 35 80 80 35 5980 1280*** 1800 1120 3720 3160 720 870 2150 700*** 760 650 300*** 10,180 8,470 4,560 Heating Load 133 Table 4. Heat Loss Calculation Sheet for Uninsulated Residence ----------------------------- (Fig. 2) (Concluded)-------------------- ---------------r-. - AB Room or Space % Part op Structure c D. E F G Crack Length Heat Loss Totale CIENT' Difp. (Btu per. hour) (Biu per hour) Lavette and Vestibule Walls (outside) , Walls (adjoining garage) 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 1840 1160*** 780 320 530 4,630 Entrance Hall Walls Door Infiltration Ceiling*1* p 39 sq ft 21 sq ft 20 lin ft 87 sq ft 0.28 0.38 0.35 0.69 80 80 80 39.8 870 640 560 2490 4,560 Garage Walls Glass Infiltration Floor (heat gain) -Heat gain 167 sq ft 53 sq ft 44 sq ft 37 tin ft 185 sq ft 0.28 45 1.13 45 0.51 45 1.62) 45 0.10<* -rl^ 2110 2700 1010 2700 -280 --4710*** 3,530. Recreation Room** Floor Walls Glass Infiltration 287 sq ft 220 sq ft 8 sq ft 8 lin ft 0.10 0.10 1.13 0.76 20 38 80 80 570 . 840 720 490 2,620 Total ` i 85,750 aThe inside^utside tdmperature 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 lfi.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 and^ then calculating 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. (One-half the total crack is used in these rooms. ^Temperature in garage assumed to be 35 F. ^Coefficient for wall adjoining garage calculated on basis of metal lath and plaster on both sides of studs. (U = 0.39.) ' ^The door crack is used for estimating the infiltration in this room and as the French doors are weatherstripped the infiltration confident is assumed to be the same as in Note b. JThe leakage for the garage doors is assumed to be twice that for poorly-fitted double-hung 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 heat transfer will be from the ground to the garage, and this beat gain should therefore be subtracted from the heat loss. "The 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 hall ceiling is included with the downstairs entrance hall because these are connected by means of the stairway. The heat should be provided downstairs.