Document LpMYrBxnyBNg2arV5Ey2meBDw

246 CHAPTER 18 1959 Guide Table 6.. .. Heating Capacities and Cfm of Branch Duds in Extended-Plenum Perimeter Systems (Continued) Section C Side Take-Off to 6-Inch Sound Pipe for Baseboerd Diffuser* Only Extended-Plenum Pressure 0.16 in. Static at 160 F Furnace-Plenum Pressure 0.16 i . Static at 170 F Actual length from Extended-Plenum to Diffuier Feel 5 10 15 20 25 30 35 40 45 50 55 60 0 Btuh 9800 9100 8430 7820 7230 6700 6200 5730 5320 4920 4550 4210 Cfm 106.6 104.4 102.3 100.3 98.5 96.8. 95.0 93.1 91.7 90.0 88.5 87.2 1 Btuh 9230 8550 7930 7360 6800 6300 5830 5400 5000 4620 4280 3960 Cfm 100.4 98.7 97.0 95.3 93.7. 92.0 90.4 88.9 87.6 86.2 84.9 83.8 2 Btuh 8740 8100 7500 6960 6420 5960 5510 5110 4730 4390 4050 3750 Cfm 96.5 93.8 92.2 90.6 89.4 88.0 86.5 85.2 84.0 82.8 81.6 80.6 3 Btuh 8300 7690 7130 6600 6110 5680 5240 4850 4500 4170 3840 3560 Cfm 91.0 89.5 88.0 86.7 85.5 84.2 83.0 82.0 80.9 79.8 78.8 77.9 4 Btuh 7930 7350 6800 6290 5830 5400 5000 4620 4270 3940 3630 3370 Cfm . 86.8 85.5 84.2 83.3 82.0 81.0 80.0 79.1 78.0 77.0 76.1` 75.3 5 Btuh 7600 7020 6500 6020 5580 5160 4770 4410 4080 3770 3470 3190 Cfm 83.6 82.5 81.3 80.2 79.1 78.1 77.1 76.4 75.3 74.4 73.5 72.8 6 Btuh 7300 6760 6260 5780 5350 4950 4560 4200 3900 3580 3300 3040 Cfm 80.4 79.5 78.4 77.5 76.3 75.3 74.4 73.5 72.8 72.0 71.2 70.6 Note: Wtere toy of the first three rone from the extended-plenum exceeds 30 ft end 9 elbow*, count 3 extre elbow* for that run. tim Equivalent Length Values used end included in ~this table ere: Diffuser end Boot -- 100 ft; Eech Elbow -- 11 ft; Side Take-off = 10 ft. Tapered Extanded-neaum Starting Collar. Section D. Top Take-Off to 6-btdi Round Pipe for Baseboard Diffusers Only Extended-Plenum Pressure 0.16 in. Static at 160 F Furnace-Plenum Pressure 0.15 in. Static at 170 F Actual length from Extended-Plenum to Piffvrer Feet 5 : 10 15 - 20 25 30 35 ' 40 45 . 50 55 60 0 1 2 3 4 5 '6 Btuh Cfm Btuh Cfm Btuh Cfm Btuh Cfm Btuh Cfm Btuh Cfm - Btuh Cfm 8700 95.0 8260 90.2 7880 86.3 7560 83.0 7260 80.0 7000 77.3 6770 74.6 8050 93.2 7640 88.8 7290 85.0 7000 82.0 6700 79.1 6470 76.3 6230 73.8 7450 91.7 6900 90.0 7090 87.5 6560 86.2 6750 6250 84.0 82.9 6470 81.0 5980 79.8 6200 78.1 5740 77.2 5970- 5490 75.4 74.5 5740 73.0 5290 72.2 6400 88.6 6080 85.0 5800 81.7 5540 79.0 5290 76.2 5070 73.8 4890 71.3 5910 8T.3 5630 83.7 5380 80.5 5130 78.0 4900 75.2 4700 72.8 4500 70.5 5470 86.0 5200 82.6 4980 79.6 4740 76.9 4510 74.3 4320 71.9 4140 69.8 5160 84.7 4820 81.7 4590 78.7 4380 76.0 4160 73.5 3990 71.2 3820 69.0 4670 83.5 4470 80.4 4260 77.6 4060 75.1 3850 72.7 3600 70.2 3520 68-3 4300 82.4 4140 79.4 3940 76.7 3730 74.2 3560 71.9 3400 69.3 3240 67.5 4000 81.3 3720 80.2 3830 78.4 3530 77.5 3620 75.8 3340 74.9 3430 73.3 3170 72.5 3290 71.0 3020 70.2 3120 68.7 2870 68.1 2980 - 2760 66.9 66.1 Note: Where any of the first three runs from tte extended-plenum exceeds 20 ft end 2 elbows, count 3 extra elbows for the! run. The Equivalent Length Tmluee used |m| included in calculating this table era: Diffuser and Boot 100 ft; Eheh Elbow 14 ft; Top Tate-off Hit Tapered Extended-Plenum Starting Collar. wall For such systems, the combinations of parts selected as standard by the National Warm Air Heating and Air Con ditioning Association are shown in Tables 9 and 10. A simplified method for selecting the combinations of branches, boots, stacks, and registers, is given in Manual 7 of the National Warm Air Heating and Air Conditioning Association.' In this method, the sizes of the branch ducts are obtained from two tables giving their Btu capacities. The proper combination of parts for each branch can be deter mined if the following information is available. 1. Location of room, that is, whether on first or second story. 2. Actual horizontal length of duct from bonnet to boot, in feet. 3. Btu loss from room to be heated. i 1 Warm Air Hearing Systems 247 Table 6... - Heating Capacities and Cfm of Branch Ducts in Extended-Plenum Perimeter Systems (Concluded) Section E. Side Take-Off to 6-tnch Rawed Pipe for Side-well end Boor Diffuser* Extended-Plenum Pressure 0.16 *. Static at 160 P Furnace-Plenum Pressure 0.15 in. Static at 170 P Actual length from fxtcuded-flenun to Diffuser--Feet 5 10 15 20 25 30 35 40 45 50 55 60 0 Btuh Cfm 8600 7930 7310 6740 6230 123.2 120.0 116.8 114.0 111.4 1 Btuh Cfm 8560 117.4 7900 114.5 7290 112.1 6720 109.2 6200 107.0 5740 104.8 2 Btuh Cfm 8510 112.7 7890 110.0 7300 107.6 6740 105.3 6230 103.1 5750 101.0 5310 99.0 3 Btuh Cfm 8540 108.2 7900 105.8 7300 103.6 6780 101.5 6270 99.6 5800 97.8 5360 95.9 4960 94.0 .4 Btuh Cfm 8580 7970 104.0 101.9 7370 99.8 6820 97.8 6330 96.0 5850 94.5 5410 92.8 5000 91.1 4620 89.7 6 Btuh Cfm 8720 100.2 8080 98.3 7490 96.7 6940 6440 94.8 _ 93.0 5960 91.4 5490 90.0 5080 88.7 4690 87.2 4320 85.0 6 Btuh 8900 8240 7630 7060 6550 6070 5600 5190 : 4800 4430 4100 Cfm 97.0 95.1 93.4 91.9 90.2 88.8 87.3 86.2 85.0 83.8 82.6 Note: Wter* any of the firxt three mo* from tte extended-plenum exceed* 20 ft end 2 elbow*, count 2 extre elbow* for that run. The Equivalent Length ValtM wed and included in --1-wUtim this table are: Diffuser and Boot - 40 ft; Each Elbow = 14 ft; Side Tate-off -- 20 ft. Tapered Extended-Plenum Starting Collar. 5800 109.1 5340 102.8 4960 97.4 4610 92.5 '4300 88.3 4020 84.7 3810 81.5 Soction F. Top Take-Off to 6-lnd) Round Pipe for Side-wall and Boor Diffuier* Extended-Plenum Pressure O.tt in. Static at 160 F Furnace-Plenum Pressure 0.15 in. Static at 170 F Actual Length from Extended-Plenum to Diffuier -feet 5 10 15 20 25 30 35 40 45 50 55 60 0 Btuh Cfm 8430 *111.2 7800 108.8 7210 106.3 6660 104.4 6170 102.2 5700 100.2 5270 98.4 4910 96.7 1 Btuh Cfm 8450 107.2 7840 105.0 7250 102.8 6700 100.7 6210 98.9 5730 97.0 5300 95.1 4900 93.4 4560 91.9 2 Btuh Cfm 8530 7900 103.2 101.1 7320 6800 99.0 97.2 6280 95.4 5790 93.8 5350 92.1 4960 90.6 4590 89.0 4250 87.8 3 Btuh Cfm 8660 8020 99.7- 97.8 7430 96.0 6900 94.2' 6370 92.4 5900 90.8 5450 89.4 5030 88.0 4650 86.7 4300 85.3 3990 84.2 4 Btuh 8810 "8180 7580 7010 6500 6000 5550 5150 4750 4400 4070 3780 Cfm 96.0 94.4 92.8 91.2 89.7 88.0 86.8 85.7 84.3 83.1 82.0 81.1 5 Btuh 8390 7770 7200 6650 6160 5700 5280 4890 4500 4170 3840 3580 Cfm 91.4 -90.0 88.5 87.2 85.8 84.5 83.2 82.4 81.0 80.0 79.0 78.3 6 Btuh 7980 7380 6840 6340 6880 5430 5020 4650 4290 3970 3660 3400 Cfm 87.5 -88.2 85.0 83.8 82.5 81.4 80.2 79.4 78.3 77.3 76.3 75.6 Note: Where any of tte first three rhns from the extended-plenum exceed* 20 ft and 3 dhow* ecmnt 3 extre dhow* for that run. The Equivalent Value* used ^ included in caloalating this table are: Diffuser and Boot 40 ft; Each Elbow 14 ft; Top Take-off GOlt Tkpercd Extended-Plenum Storting Cedar. 4. Equivalent lengths in feet of all fittings and of the register. Fig. 7 shows the values of equivalent lengths of fittings com monly used for domestic systems. This simplified method is applicable to structures having heat losses not in excess of approximately 120,000 Btu per hour. The capacities shown in Tables 9 and 10 are bared upon the most reliable data pertaining to friction losses and temperature drops in ducts. They are also based upon a 100 deg temperature rise of the air, and a static pressure available for overcoming friction losses in the external duct system alone of 050 in. of water. The use of this method requires that the fan in the fan-furnace assembly will be capable not only of overcoming the resistance of the external duct system alone, but also the resistances imposed by the blower inlet, the filter, and the furnace casing. Tables 9 and 10 are applicable for the selection of both warm air and return air branches. A depth of 8 in. has been adopted as the standard for trunk ducts, and where a branch