Document 2RbZJJyYb38bzvOZ7n2GDejBR

Notes for Table 8. a The inside-outside temperature difference is 70-- (--10) or 80 F except where otherwise noted. b Volume of infiltration, cfh - (no. air changes) x (floor or ceiling area) x (ceiling height). t.hr. ocdduFTTgrhhhoeemthcceeeEiillqciinnueggialitnhh.i.ogee..n.aa.u.tt5sllooa^in.ssgTsseentssnheaaerarreetpurccoeaapdllcceiuufrflleaatertteeemnddpcbbeyyr.aeetTussrhtteiimmisdaaiufttfniiennhrggenatthhcteeeed.aaattTtttiitcchicittseeismmunnpphoeeetrraaavttteuundrreetialaaatnnteiadcdtmihsdmeunnroinctgavlecnutlailatitnegdthdeurl_ion_s_gs i winter months. The.attic temperature is estimated from Equation I fco *be --30.--2 rF' when *the outsidAe tfiekrfhn.- `iI perature is -- JO F and room temperature is 70 F. The temperature difference is then 70--30.2 or 39.8 deg. *rJ For the insulated residence, attic temperature becomes 4.6 F and temperature difference 70--4.6 -- 65.4 deg. .1 e Temperature in garage assumed to be 35 F. ' 4' * 1 Coefficient for wall adjoining garage calculated on basis of metal lath and plaster oh both sides of studs $ (V -039). ' |j *b OEnxpeohsaeldf oofnvtawluoeafidroesm, wTeaabtlhee4r,stCrihpapepdterw1in1d, ofowrssotoffrsmetwbiyndfiorew-sploacr ew. eaUthseer1sVtr4i.pping. ^ 1 Window on one side weatherstripped but double-doors are hard to close tightly. Hence, conservative^ valuieAosfsu1m)4-ing kitchen vent, door to vestibule usually open, allow full table value of 1}$. k One-half value in Table 4, Chapter -11, increased to 1H by nearby outside door in vestibule. ' i'lL i Full value in Table 4, Chapter 11, to allow for frequent opening of outside door. m Two sides exposed, large doors but large volume. Use-value 1^5 as given in Table 4, Chapter H. D Two small unweatherstripped windows in protected location, but fireplace, indicate 1* change. llpQ HNeegaltelcotssheesaftrolomssthtoesbearsoeommesnitn, atos gloasrsaegsefaroremhebaotilgear,inpsipfoinrgg,areatgce.,. will probably keep basement near/'jg if not above, 70 F. - ^ 1 Upstairs hall ceiling figures with downstairs. Heat should be provided downstairs for both. * Linear feet of exposed edge. Table 9. Summahy of Heat Losses of Uninsulated Residence (Btu Per Hour Room or Space Bedroom A Bedroom B Bedroom C Bedroom D Bathroom 1 Bathroom 2 Lving Room Dining Room Kitchen Lavette Entrance Hall Garage Recreation l.. a Wall heat loss of 2110 Btuh minus wall heat gains of 1280, 700 and 1160 Btuh. 310 Btuh. c Based on'V4 oomputed inflltration. d Based on operating totals. rgr Heat gains of 960 -- SUMMAKY Table 10. Room or Space OF HEAT Walls LOSSES OF Ceiling and Roof INSULATED RESIDENCE (Btu Per ~ m, Glass and Infil Totaia^ .Floor Door tration Bedroom A Bedroom B Bedroom C Bedroom D Bathroom 1 Bathroom 2 Living Room Dining Room Kitchen Lavette Entrance Hall Garage Recreation Design Totals Operating Totals* Percentages 2480 1620 1190 1230 310 760 3370 1730 1320 1390 410 --470* 840 16.180 16.180 29.1 2460 1660 1260 1080 540 250 850. -910" 7.190 7.190 12.9 690 220 1060 570 2.540 2.540 4.6 1440 1440 1)70 720 500 320 -1800 3100 950 1100 640 3710 7*:o 17.410 17.410 31.3 Wall heat less of 980 Btuh minus wall heat gains of 590, 320 nod 540 Btuh. Btuh. Based on >4 computed infiltration. d Based on operatmg totals. 2180 1470 1260 950 630 400 5400 3080 2300 550 1600 1910 2890 24.620 12.310 22.1 3 Heat gains 4.6 1.9cvv- i.M%> 1O.570J 7.910?*, 4.570;,rf 3-OWfe 19$. 5,020 Heating Load 263 are to have storm sash. The building is constructed as follows (heat transmission coefficients ?/ are parentheses): : Walls: Brick veneer, building paper, wood sheathing, studding, metal lath and bplraicskterve(n0e.2e8r ).(0.W26a).lls of dormer over garage, same except wood siding in place of Attic Walls: Brick veneer,,building paper, wood sheathing on studding (0.42). Basement Walls: 10 in. concrete (0.10). Boo/.* Asphalt shingles on wood sheathing on. rafters (0.53). Ceiling (Secondfloor): Metal lath and plaster (0.69). Windows: Double-hung wood windows averaging 70 percent glass (0.45; from Chapter 9, Table 19, 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 19,- U is 1.13 for all glass and the application factor is 1.00). French doors in dining room 50 percent glass, no storm doors (0.85; from Chapter 9, Table 19, 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 (0.25). 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 of the results in Table 9. The values in column F of Table 8 were obtained by multi plying together the figures in columns C, D, and E. The heat losses are calculated to the nearest 10 Btu. See reference notes for Table 7 for further explanation of data. Attention is called td^the summary of heat losses (Table 9) for the uninsulated resi dence. As storm windows are used in this instance the glass and door transmission heat losses of 19.8 percent are relatively small. The infiltration losses of 14.0 per cent are also comparatively small because the storm windows are equivalent to weatherstripping. In this problem, the wall, ceiling and floor transmission losses comprise 66.2 percent of the total. Example 7: Calculate the heat loss of residence shown in Fig. 2 based on the same conditions as in Example 6 but having construction improved or insulated to obtain coefficients as follows: Walls, 0,13; Walls of Dormer over Garage, 0.12; Attic Walls, 0.28; Walls Adjoining Garage, 0.18; Basement Walls {Recreation Room), 0.10. Roof, 0.53. Ceiling (Second Floor), 0.15. Windows (Same as in Example 6). Floor (Bedroom D), 0.18. Solution: The procedure for calculating the heat losses is similar to that for Example 6. A summary of the results is given in Table 10. REFERENCES \ Application Engineering Standards for Air Conditioning for Comfort, (1947), Air Conditioning n Refrigmting Machinery Association, Inc., pages 4 to 7. . An Analysis of Winter Temperatures for One Hundred and Twenty Cities, by Clark M. Humphreys VLornegte Institute of Technology Bulletin 1939). q. * Investigation of Oil-Fired Forced Air Furnace Systems in the Research Residence, by A. P. Krata and ttonso (University of Illinois Engineering Experiment Station Bulletin No. 3181. B * ^riormance of a Hot-Water Heating System in tbe I=B=R Research Home at the University of Illi- hy A. P. Krata, W. S. Harris, 11. K. Fahnestock, and R. J. Martin (University of Illinois Engineering az1^ment Station Bulletin No. 349). * /{i* A Study of Radiant Baseboard Heating in the I=B=R Research Home, by A. P. Kr&tz&nd W. S. Harris 4r**ty of Illinois Engineering Experiment Station Bulletin No. 355). of 1 a One-Pipe Steam System in the I=B=R Research Home, by W. S. Harris (University 7 n0w Engineering Experiment Station Bulletin No. 383). Research Report No. 1011--Tests of Three Heating Systems in an Industrial Type of 185) k. Larson, D. W. Nelson, and John James (A.S. H.V.E. Transactions, Vol. 41, 1935, p. ^lpenetky!r>0* Moisture Control and Their Application to Building Construction, by F. B. Rowley, A. B. * 8n<* E. Lund (University of Minnesota, Engineering Experiment Station Bulletin No. 17). Houii^ ^ y Research Report No. 1213--Heat Loss Through Basement Walla and Floors, by F. C. 369). lD' Taimuty, Cyl Gutberlet and C. J. Brown (A.S.H.V.E. Transactions, Vol. 48, i942, p. Measurements of Heat Losses from Slab Floor, by R. S. Dill, W. C. Robinson and H. E. Robinson