Document 1mbBqVwRxgnm7bvYOmmBNB0X

American Society of Heating and Ventilating Engineers Guide, 1931 10. Construction: Walls--12-in. brick, with J-in. plaster applied directly to inside surface. ' Roof--3-in. stone concrete and built-up roofing. Floor--5-in. stone concrete on 3-in. cinder concrete on dirt. Doors--One 12 ft. x 12 ft. wood door (2 in. thick) at each end. Windows--Fifteen, 9 ft. x 16 ft. single glass double-hung windows on each side. 11. Transmission coefficients: Walls--(Table 9, Chapter 3)............................... .............................. U = 0.277 Roof--(Table 29, Chapter 3)._............................................................ U = 0.610 Floor--(Table 28, Chapter 3)..............................,,..................... ....... U = 0.521 Doors--(Table 33B, Chapter 3)......................................................... U = 0.382 Windows--(Table 33A, Chapter 3)--................ .............................. U = 1.13 12. Infiltration coefficients: Windows--Crack assumed Yi in. The leakage per foot of crack for an 11-mile wind velocity is 92.7 cu. ft. per hour, for a plain window. (By interpolation from Table 2, Chapter 4). The heat equivalent per hour per degree is 92.7 X 0.075 X 0.24 = 1.67 B.t.u. Doors--Assume infiltration loss through door crack twice that of windows or 2 X 1.67 = 3.34 B.t.u. 13. Calculations: See calculation sheet, Table 6. RESIDENCE (See Fig. 2) 1. Location.......................................................... ................. ......... _................ :...... ---Chicago, 111. 2. Lowest outside temperature (Table 3)............................-.............. -- 23 deg. fahr. 3. Base temperature__ ____ .____________ (-- 23 + 15) = -- 8 deg. fal 4. Direction of prevailing wind (during Dec., Jan., Feb., Table 3)........Southwest 5. Inside temperature)....................................... ................................ ...... -.............70 deg. fahr. 6. Temperature difference (item 5 -- item 3).............................................78 deg. fahr. 7. Average wind velocity (during Dec., Jan., Feb., Table 3)___ 17 miles per hour Fig. 2. Floor Plan of Six-Room Residence3 Plan 6-F-3, Architects Small House Service Bureau. 92 Chapter 5--Heat Loss Calculations ,, 7 a Summary of Heat Loss Calculations for Residence Table i-n- Shown in Fig. 2 Room ob Space No. Room Glass Trans mission Losses Other Trans mission Losses Infiltra tion Losses Total 1 2 3 4 5 6 7 8 9 10 11 12 Dining Room........................... -----................. Kitchen............................................ Dining Alcove.--......................-.... Vestibule................... ...................... Bedroom (A) and Closet................ Bedroom (B) and Closet..... ...... Bedroom (C) and Closet..... .......... Upstairs Hall--..... ...................................... Bath........ ---.................................................. Attic (heated)--....................... ......... 7,100 2,640 1,060 1,370 1,888 1,854 3,773 3; 960 2,900 1,450 1,450 3,040 9,040 4,640 3,300 3,718 1,312 1,436 3,558 4,070 3,765 920 1,940 28,021 8,970 742 663 807 4,320 3,900 1,445 1,445 1,660 1,660 1,660 1,125 25,110 8,022 5,023 5,895 7,520 7,190 . 8,776 9,475 8,325 4,030 5,050 32,186 Total of heat required for building in B.t.u. per hour at --8 deg. h a 17-mile southwest wind------------- 126,602 Table 7-B. Heat Loss Calculation Sheet for Living Room (Fig. 2)' Part of Building Exposure Net Surface Area or Crack Length Co efficient Temp. Difference Net B.t.u. Exposure Factor Total B.t.u. Wall.............. Glass.._.......... Crack Jf6 ina E E E 75.6 15.0 19.0 Wallb.............. Doors.............. Crack JJe in-- S S S 127.6 42.0 40.0 Wall................ Glass............... Crack Jfein.3 W W W 75.6 15.0 19.0 Floor._______ Over Basement. 241.0 0.263 1.13 0.5 0.263 1.13c 2.50 0.263 1.13 0.50 0.339 78 78 78 78 78 78 78 78 78 33c 1,550 1,320 (742)4 2,620 3,710 7,800 1,550 1,320 (742)4 2,700 1.15 1.15 1.15 1.15 1.15 Grand Total of heat required for room in B.t.u. per hour at --8 deg. with a 17-mile southwest wind...................................................................... 1,550 1,320 3,010 4,260 8,9704 1,780 1,520 2,700 25,110- ^Windows weatherstripped. . ^Chimney figured as part of wall, that is, of the same construction. cTransmission coefficient taken same as glass for entire door. dThree^sides of this room are exposed and therefore only the wall having the greatest infiltration loss is used in estimating the total leakage for the room. If the infiltration loss for the south side of the room con taining the two outside doors had been less than half the total infiltration loss for the room, then half the total leakage would have been used. Air temperature at floor assumed 65 deg. fahr. Air temperature in basement assumed 32 deg. fahr. 93