Document ppQRwwod6nmL10RroVOKjMz4X

272. CHAPTER 14 1946 Guide Table 4. Heat Loss Calculation Sheet for Uninsulated Residence 7 ': (Fig. 2) - ra .5 B ; -- .7. c .. D E F ^- - G. Room ob Spacb Pabt or Structure ' , Net Abba ob COEFFI Temp. Heat Loss Totals . Crack Length CIENT Dipf. (Btu per hour) (Btu per boor Walls ` 238 sq ft 0.28 80 5330 Bedroom A Glass * infiltration 40 sq ft 0.45 80 36 lin ftb 0.35' .80 1440 1010 Ceiling4 r . 242 sq ft 0.69 39.8 6660 14,440 Walls' . Bedroom B Glass - and Closet Infiltration 156 sq ft 0.28 80 * 40 sq'ft' 0.45 80 r 36 lin fte 0.35 80 3490' 1440 1010 . *` Ceiling4 . , . 160 sq ft 0.69 39.8 . . 4400 10,340 Walls . 114 sq ft 0.28 80 . 2560 Bedroom C Glass ' Infiltration 27 sq ft 0.45 80 18 lin ftf 0.35 80 970 500 Ceiling4 120 sq ft 0.69 39.8 3300 . 7,330 Walls 118 sq ft 0.28 80 2650 Bedroom D Glass 20 sq ft 0.45 80 ' 720 and Closet Infiltration Ceiling4.-'.:7.;... ' 18 lin ft 0.35 80 120 sq ft . 0.69 ; 39:8 500 3300 h loor over Garage 110 sq ft 0.25 35s 960m 8,130 .Walls 30 sq ft 0.28 80 670 Bathrooml Glass ; 14 sq ft 0.45 80 500 Infiltration 18 lin ft 0.35 80 500 Ceiling4 - 55 sq ft 0.69 39.8 .1510 3,180 Walls 79-sq ft 0.26 80 ' 1770 Bathroom 2 Glass :. Infiltration 9 sq ft 0.45 80 .320 15 lin ft 0.35 80 . 420 . Ceiling4 35 sq ft 0.69 39.8 960 ' Living Room h loor over Garage - 35 sq ft . Walls , 267 sq ft . Walls (adjoining garage) . 94 sq ft Glass 50.sq ft 0.250.28 0.39h 0.45 35 80 ' 35 80 310m 5980- . ,, \ 3,780 . 1280" 1800 Infiltration' 40 lin ft 0.35 80 1120 `10,180 Dining . Room Walls Glass .(doors) Glass (window) 166 sq ft 35 sq ft 20 sq ft 0.28 80 1.13 80 0.45 80 3720 3160 - 720 . Infiltration1 31 lin ft 0.35 80 870 .....8,470 Kitchen and Entrance - to Garage ' Walls (Outside)' - 96 sq ft " 0.28 Walls (adjoining garage) 51 sq ft 0.39h Infiltration 27 lin ft 0.35 Glass - - 18 sq ft . 0.45 , 80 35 80 80 2150 700" 760 650 Door to garage . 17 sq ft : * 0.51 35 300" 4,560 Walls (outside) . . 82 sq ft 0.28 80 1840. Lavette and Vestibule Walls (adjoining garage) Door . .'. Glass ,,' 85 sq ft . 19 sq.ft 9.sq ft 0.39h 35 ,0.51 80 0.45 . '80 1160" 780 320 > Infiltration . 119 lin ft 0.35 80 . 530 . 4,630. Entrance Hall Walls , . Door Infiltration. . \ 39 sq ft . 21 sq ft 20 lin ft 0.28 0.38 0.35 80 80 V 80 870 . '640 ' 560 Ceiling4* p 87 sq ft 0.69 39.8 2490 ' 4,560 Walls -, , 167 sq ft .0.28 45 -. 2110 Glass : . #. 53 sq ft .1.13 45 . ,,2700; . Garage Doors 44 sq ft 0.51 45 1010 Infiltration , . 37 lin ft .1.62) 45 . . 2700 ' Floor (heat gain) 185 sq ft 0.10k -15^ -280. Heat gain -4710" 3,530 Floor ' . 287' sq ft ' 0.10 20 ' - 570 Recreation Walls .220 sqift . 0.10 ,38.. : V 840 - Roomn Glass, . . 8 sq ft 1.13 80 .. : 720 ' Infiltration 8 lin ft 0.76' 80 ` .490 . ...' 2,620.. .< .Total 85,750 i Notes for Table 4. \ The inside-outside temperature difference is 70 -? ( --10) or 80 F, except where otherwise not bOnly the south windows are used for arriving at the window crack-for this room, on the assn that whatever air enters through the south window cracks .will- leave through the west window or elsewhere. cDouble-hung wood windows with storm sash are assumed to have the same leakage per foot of c. as weatherstripped windows. The air leakage per foot of crack is about 19.5 cu ft per foot of crack ft wind velocity of 12.5 mph. fSee Table 2. Chapter 8.) The heat equivalent of the air leakage per (hoi , (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 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 b 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 b assumed to be the same as in Note h. jThe leakage for the garage doors b 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 b therefore 0.018 X 90 or 1.62. - i kThe ground temperature b assumed to be 50 F and. as the garage temperature b 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. 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 b therefore figured onthebasb ofa70 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 b included with the downstairs entrance hall because these are connected by means of the stairway. The heat should be provided downstairs.. Example 5 {continued) Floor {Basement and Garage): 4 in. stone concrete on 3. in. cinder concrete (0J0). Solution: The calculations for this problem are given in.Table .4, and a summary of the results in Table 5. The values in column F of Table 4 were obtained by multiplying together the figures in columns C, D and E. The heat losses are calculated to the nearest 10 Btu. See reference notes for Table 4 for further explanation of data. Attention is called to the summary of heat losses (Table 5) of the uninsulated residence (Fig. 2). As storm windows are used in this instance the glass and door trans- Table 5. Summary .of Heat Losses of Uninsulated Residence Heat losses given in. Btu per hour Room ob Spacb Bedroom A Bedroom B Bedroom C Bedroom D Bathroom 1 . Bathroom 2 Living Room Dining Room Kitchen Lavette Entrance Hall Garage Recreation Totals Percentages ' Walls Ceiling and Root Floob Glass and Doob Infiltration Totals 5330 3490 2560 2650' 670 1770 .7260 3720 2850 3000 870 -1030s 840 6660 4400 , 3300 3300 1510. 960 \ 960 310 2490 . ----- _- -1550b 570 1440 1440 970 . 720 '500. 320 1800 3880 950 "1100 . 640 3410 720. 1010 1010 500 . 500- 500 , 420 .. 1120 870 760 530 560 . 2700 490 . 14^440 10,340 7,330 8,130 . 3,180 : 3,780 . 10,180 .8,470 4,560 . 4,630 4,560 , 3,530 2,620 33,980 . 22,620 .290 .17,890 10,970 85,750 39.6 26.4 0.3 '' ' 2ol9 12.8 100.' Wall heat loss of 2110 Btu minus wail heat gain of'3140 Btu. bHeat gains; 960, 310 and 280 Btu.