Document KRzagZ8LMZDVGXRd75m640QZQ

484 A' CHAPTER 19 1957 Guide <-ap.'.ties and Cfm of Individual Ducts in Perimeter Ststems Used in Crawl-Space or Basement Construction SECTION A. FOE 5-INCH INDIVIDUAL ROUND PIPE AND FOR SIDEWALL, FLOOR, AND Bonnet Preeeure 0.16 in. Static BASEBOARD DIFFUSERS Bonnet Temperature 170 P Actual Length of Pipe pbom Bonnet to Diffuser-Feet No. of Elbows 0 Btuh Cfm ---5 10 15 20 25 30 35 40 -- 45 50 55 60 65 70 75 80 8700 100.5 7900 96.2 7150 92.7 6450 89.7 5800 87.0 5230 84.6 4700 82.5 4230 80.4 3830 78.4 3470 76.5 3150 74.8 2860 73.2 71.7 1 Btuh Cfm 2 Btuh Cfm 8620 95.8 7800 91.7 7100 88.7 6470 86.0 5830 83.8 5350 81.6 4850 79.7 4370 77.7 3960 76.0 3600 74.2 3260 72.5 2950 71.2 2650 69.8 68.5 8700 7900 90.8 87.9 7180 85.2 6530 82.7 5950 80.7 5400 78.9 4920 77.1 4430 75.4 4050 73.6 3680 72.0 3350 70.5 3040 69.2 2750 67.9 2480 66.7 2220 65.6 3 Btuh Cfm 8800 8000 7300 86.6 84.0 81.5 6650 79.3 6070 77.5 5530 75.8 5050 74.3 4600 72.8 4180 71.3 3800 70.0 3440 68.7 3120 67.5 2830 66.3 2560 65.2 2300 64.1 63.0 4 Btuh Cfm 8250 7520 6850 81.0 78.8 77.0 6230 75.3 5680 73.7 5180 72.2 47 20 70.8 4300 69.5 3900 68.2 3550 67.2 3220 66.0 2900 65.0 2630 63.6 2360 62.5 2120 61.5 60.5 5 Btuh Cfm 7720 7050 6420 76.4 74.S 73.0 5840 71.6 5330 70.3 4850 69.0 4430 67.? 4030 66.6 3650 65.5 3320 64.4 3020 63.2 2730 62.0 2460 61.2 2200 60.2 1960 59.2 58.1 6 Btuh Cfm 728(1 663C 607C 72.8 71.2 69. f 5530 68.5 505C 67.3 4600 66.C 418C 64.' 380C 63.5 347C 62.4 315C 61.4 285C 60.5 255C 59.5 2281 58. 2051 57.? 1821 57.C 1600 56.3 i................................................................................................. ....................... _________________________________ __________________ The Equivalent Length Values used and included in calculating this table are: Diffuser and Boot =* 35 ft; Plenum Takeoff = 15 ft; Each Elbow = 12 ft. For each additional 12 ft equivalent length of boot and diffuser count one additional elbow. All cfm values are based on standard air. SECTION B. FOR 5-INCH INOmDUAL^UND^PE AND FOR SIDEWALL AND Bonnet Pressure 0.1S in. Stotic Bonnet Temperature 170 * Actual Length of Pipe from Bonnet to Diffuser--Feet Elbows 5 | 10 15 20 25 30 35 40 45 50 55 60 65 70 .0 . 1' 2 3. 4 5 6 Btuh Cfm Btuh Cfm Btuh. Cfm Btuh Cfm Btuh Cfm Btuh Cfm Btuh Cfm -- 8700 127.7 8060 124.8 7460 122.3 6920 119.7 , 59601.5550 117.4 115.0|ll3.0 8820 122.8 8000 120.0 7430 117.6 6900 115.3 6400 113.0 5930 , 5500 . 5100 111.0 109.0 107.3 8600 118.5 7960 116.2 7390 114.0 6860 112.0 6380 110.0 5940 107.8 5530 106.0 , 5150| 104.51103.0 8640 114.0 8020 112.0 7450 110.0 6950 108.2 6460 106.5 6020 104.7 5600 103.0 5200 101.4 4850, 4500 99.6 98.0 8760 110.2 8160 108.4 7580 106.6 7050 105.0 6540 103.0 6080 101.5 5640 100.2 5250 99.0 4880 97.5 45501 96.0 4250 94.5 8850 8250 7670 7140 6640 106.8 105.0 103.5 102.0 100.5 9050 8420 7840 7280 6750 6300 104.0 102.5 100.7 99.2 97.8 96.6 6170 99.0 5850 95.2 5740 97.5 5440 94.0 5340 96.0 5060 92.6 4960 94.6 4700 91.4 4620 93.4 43VU 90.0 91-0 3760 87-5 The Equivalent Length Values used and included in calculating this table are: Diffuser and Boot 9 *0 ft; Plenum Takeoff 9 20 ft; Each Elbow = 14 ft. For each additional 14 ft. equivalent length of boot ana diffuser count one additional elbow. All cfm values are based on standard air. calculate ita heat loss. Information in Manual 3 supplements6 that contained m Ch2a.pDteer t1e2rm, pinaertitchuelarrelyquwiriethd rfeusrpneacctet-obocnrnaewtl cspaapcaecihtyeaftrolomsseths.e heat loss of the bu3ild. iLnogc. ate the diffusers on the plan. Allow at least one diffuser for each exposed Warm Air Heating Systems '485 Table 4. Btuh Capacities and Cfm of Individual Ducts in Perimeter Systems Concluded)Used in Crawl-Space or Basement Construction (i SECTION C. FOR 6-INCH INDIVIDUAL ROUND PIPE AND FOR BASEBOARD DIFFUSERS ONLY Bonnet Pressure 0.15 in. Static Bonnet Temperature 170 P No. OF Elbows Actual Length of Pipe from Bonnet to Diffuses--Feet 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 0 Btuh Cfm 8570 8000 7450 6910 6420 5960 5560 5150 4800 4450 4160 109.0 107.2 105.5 103.7 102.0 100.4 98.8 97.5 96.1 94.8 93.5 Btuh Cfm 8700 8100 7550 7000 6520 6060 5630 5250 4860 4530 4220 3930 105.5 104.0 102.3 100.7 99.2 97.6 96.2 95.0 93.6 92.3 91.1 90.0 2 Btuh Cfm 8890 6270 7700 7160 6660 6200 5750 5350 4980 4620 4300 4000 3700 102.8 101.3 99.8 98.2 96.7 95.3 94.0 92.7 91.5 90.2 89.0 87.8 86.5 3 Btuh Cfm 8440 7870 7320 6820 6350 5880 5460 5070 4700 4350 4020 3710 3440 98.4 98.8 95.3 93.9 92.5 91.3 90.0 89.0 88.0 86.9 85.8 84.7 83.5 4 Btuh Cfm 8690 8080 7500 6980 6500 6030 5580 5180 4800 4450 4120 3820 3520 3250 95.8 94.4 93.0 91.6 90.3 89.0 87.8 86.7 85.7 84.6 83.7 82.6 81.6 80.5 5 Btuh 8940 8320 7740 7200 6680 6190 5720 5320 4920 4550 4220 3890 3600 3350 3100 Cfm 93.4 92.2 91.0 89.8 88.5 87.3 86.2 84.8 83.8 82.8 81.7 80.8 79.9 79.0 78.0 6 Btuh 8580 7960 7380 6850 6350 5880 5440 5040 4660 4320 4000 3670 3400 3150 2930 Cfm 90.0 89.8 87.6 86.5 85.5 84.2 83.1 82.0 80.9 80.0 79.0 78.0 77.3 76.5 76.0 The Equivalent Length Values used and included in calculating this table are: Diffuser and Boot 9 100 ft; Plenum Takeoff = 20 ft; Each Elbow = 14 ft. For each additional 14 ft equivalent length of boot and diffuser count one additional elbow. All cfm values are based on standard air. wall in each room or area of building, and locate them preferably beneath window areas. For residential installations limit each diffuser to a maximum of 7,000 Btuh. 4. Determine the required Btuh delivery of each diffuser. Where more than one diffuser is used per room, proportion the heat loss equally among all diffusers. 5. Measure length and count number of elbows in each duct. From Table 4, deter mine the duct size (5 or 6-in. diameter) needed. Section A is for 5-in. duct, Section B is for 6-in. duct using sidewall or floor diffusers, and Section C is for 6-in-, duct using baseboard diffusers. Perimeter Extended Plenum Systems in Crawl Space or Basement Con struction The considerations involved in the design of extended plenum systems are essentially the same as those of the individual pipe system. A simpli fied design procedure is summarized as follows: p, ^ Calculate the heat loss of each room or area using the method explained in Chapter 12. Consider the basement or crawl space as a part of the structure and calculate its heat loss. Information in Manual 3 supplements* that contained in onapter 12, particularly with respect to crawl space heat losses. buddin6^TM1'116 re<'u*re<^ furnace-bonnet capacity from the heat loss of the ?. Locate the diffusers on the plan. Allow at least one diffuser for each exposed a.,111 mom or area of building, and preferably beneath window areas. For siaential installations limit each diffuser to a maximum of 7,000 Btuh. Determine the required Btuh delivery of each diffuser. Where more than one user is used per room, proportion, the heat loss equally among all diffusers. Plen ^easure length of each duct and count number of elbows from the extended Frotn't the diffuser. Note whether top or side plenum take-offs are to be used, (g 1 ahle 5, determine the duct size needed. (Note: Use that section of Table 5 fi used1) ^ ^ which applies both to the type of plenum take-off and diffuser to system^ values 'n Table 5 are used with Table 6 for sizing the extended plenum tem' No one extended plenum should exceed 35 ft in length.