Document ExzB8xEgBMKnR2a5Dm1ZdpEQL

284 CHAPTER 12 1958 Guide _x Notes eob Tablb 8. The inside-outside temperature difference is 70- (-10) or 80 F except where otherwise noted, h Volume of infiltration, cfh = (no. air changes) x (floor or ceiling area) x (ceiling height). c From Equation 5a. d The ceiling heat losses are calculated by estimating the attic temperature and then calculating the lees through the ceding using the proper temperature difference. This unheated attic.is not ventilated duns* winter months. The attic temperature is estimate from Equation l.tpbe 30.2 F'when the outode tem. peratura is -10 F and room temperature is 70 F. The temperature difference is then 70-30.2 or 39.8 deg. For the insulated residence, attic temperature become 4.6 F and temperature difference 70-4.6 = 65.4 deg. 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). s One hall of value from Table 4. Chapter 11, for storm windows or weatherstripping. t Exposed on two sides, weatherstripped windows offset by fire-place. Use lii. I Window on one side weatherstripped but double-doors are hard to close tightly. Hence, conservative i jAg-wnming kitchen vent, door to vestibule usually open, allow full table value of XYi. k One-half value in Table 4, Chapter 11, increased to 1H by nearby outside door in vestibule. 1 Full value in Table 4, Chapter 11. to allow for frequent opening of outside door. m Two sides exposed, lage doors but large volume. Use value 1H as given in Table 4, Chapter 11. n Two small unweatherstripped windows in pro tected location, but fireplace, indicate 1 change. p Heat losses from these rooms into garage are heat gft.inn for garage. Neglect heat loss to- basement,, as losses from boiler, piping, etc., will probably keep basement near, if not above, 70 F. r Upstairs hall ceiling figures with downstairs. Heat should be provided downstairs for both. 8 T,inpar feet of exposed edge. BASEMENT PLAN Eft}. ?. Floor Plans op Residence Heating Load 285 Table 9. Sumhaet op Heat Losses op Uninsulated Residence {Blu Per Hour) Room ob Space Walls Ceiling and Roof Floor Glass and - Doob Infil tration Totals Bathroom 2 Living Room Dining Room Kitchen Lavette Entrance Hall Garage Recreation Design Totals Operating 'ratals'* Percentages'1 5520 3620 2650 2740 690 1640 7480 3850 2920 3060 900 -960* . 840 34,950 34,950 38.4 74-10 5000 3800 3240 1620 1060 2560. --1280b 23,410 23,410 25.8 960 320 1060 570 2,910 2,910 3.2 1440 1440 970 720 500 320 1800 3100 950 1100 640 3710 720 17.410 17,410 19.1 2180 1470 1260 950 630 400 5400 3080 2300 550 1600 1910 2890 24.620 12,310 13.5 16.550 11,530 8.680 8,610 , - 3,440 3.740 14.680 10.030 '6,170 4.710 . 5. 700 4,440 5,020 103,300 90,990 100.0 * Wall heat loss of 2180 Btuh minus wall heat gains of 1280, 700 and 1160 Btuh. b Heat gains of 960 and 320 Btuh. Based on H computed infiltration. * Based on operating totals. are to have storm sash. The building is constructed as follows (heat transmission coefficients U are parentheses): Walls: Brick veneer, building paper, wood sheathing, studding, metal lath and plaster (0.29). Walls of dormer over garage, same except wood siding in place of brick veneer (0.26). Attic Walls: Brick veneer, building paper, wood sheathing on studding (0.42). Basement Walls: 10 in. concrete (0.10). Roof: Asphalt shingles on wood sheathing on rafters (0.44). Ceiling {Second floor): Metal lath and plaster (0.74). Windows: Double-hung wood windows averaging 70 percent glass (0.45; from Chapter 9, Table 18, Section D, the U value for wood windows with storm sash is 0.53 X application factor; by interpolation this factor is 0.85). Steel casement sash in garage and basement (1.13; from Chapter 9, Table 18, U is 1.13 for all glass and the application factor is 1.00). French doors in.dining room 50 percent glass, no storm uoorB (0.85; from Chapter 9, Table 18, U is 1.13 for all glass; by interpolation the application factor is 0.75). Floor {Bedroom D): Maple finish flooring on yellow pine sub-flooring; metal lath and plaster ceiling below (0.26). Floor {Basement and Garage): 4 in. stone concrete on 3 in. cinder concrete (0.10). Solution: The calculations for this problem are given in Table 8, and a summary Table 10. Spmmaby of Heat Losses of Insulated Residence (Btu Per Hour^ Room ob Space Walls Ceiling and Hoop Glass and Doob Infil tration Totals edroom A Bedroom B Bedroom C Bedroom D Bathroom 1 Bathroom 2 Living Room Room Kitchen Lavette Entrance Hall Oarage Recreation Design Totals Operating Totals Percentages'1 2480 1620 1190 1230 310 760 3370 1730 1320 1390 410 -470* 840 16.180 16,180 29.1 2460 1660 1260 1080 540 250 850. -91<P 7.190 7.190 12.9 220 1060 570 2,540 2,540 4.6 1440 1440 970 720 500 320 1800 3100 950 1100 640 3710 17.410 17.410 31.3 2180 1470 1260 950 630 400 5400 550 1600 1910 2890 24,620 12,310 22.1 - 8.560 6.190 4.680 4.670 1.980 1.950 10.570 7.910 4.570 3.040 3.500 5.800 5.020 67.940 55.630 100.0 Btuh. e Based*063 ?! Btuh minus wall heat gains of 590, 320 and 540 Btuh. b Heat gains 690 and 220 0D ^ imputed infiltration. d Based on operating totals.