Document b8mme5yXQm0y5xZm6qL9m0q0

HEATING VENTILATING AIR CONDITIONING GUIDE 1941 Table 3. Heat Loss Calculation Sheet for Uninsulated Residence (Fig. 1) AB c DE F G Booh ob Space Part op Structure Net Area or Crack Lenoth Coeffi cient Temp. Diff.a Heat Loss Totals (Btu per hour) (Btu per boor) Bedroom A Walls Glass Infiltration Ceiling^ 238 sq ft 40 sq ft 36 lin ftb 242 sq ft 0.28 0.45 0.35c 0.69 80 80 80 39.8 Walls Bedroom B Glass and Closet Infiltration Ceiling*1 156 sq ft 40 sq ft 36 lin fte 160 sq ft 0.28 80 0.45 80 0.35 80 0.69 . 39.8 Bedroom C Walls Glass Infiltration Ceiling*1 114 sq ft 0.28 80 27 sq ft 0.45 80 18 lin ftf 0.35 80 120 sq ft 0.69 39.8 Bedroom D and Closet 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 35 Bathroom 1 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^ 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 Hn ft- 0.28 80 0.39h 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 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 0.35 0.45 0.51 80 35 80 80 35 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 0.39h 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 4,630 122 CHAPTER 5. HEATINC LOAD T,,,. q Heat Loss Calculation Sheet for Uninsulated Residence TabL (Fig. 1) (Concluded) A ;-------- Room or Space B ----------------- - Walls Door Infiltration Ceiling*1- d Garage Walls Glass Doors Infiltration Floor (heat gain) Heat gain Recreation" Floor Walls Glass Infiltration Total c DE F G Net Area or COEFFI- Temp. Heat Loss Totals Crack Lenoth CIENT Dip.* (Btu per hour) (Btu per hour) 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 80 0.38 80 0.35 80 0.69 , 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. 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 assumM 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 4.) 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. 1 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 1 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. eThe 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. ^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 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-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 45 F and, as the garage temperature is 35 F, the heat transfer will be from the ground to the garage, and this heat gain should therefore be subtracted from the heat loss. The floor coefficient (/ = 0.64) is based on 4 in. stone concrete and 3 in. cinder concrete. This coefficient should probably be lower as the ground itself has some heat resistance value. ' However, complete data are not as yet available. mThe heat losses from various rooms into the garage are heat gains for the garage. "Heat 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. Ground temperature assumed to be 45 F. 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. 123