Document 996j7avbvadrjzkQ0xkX6Mm3L
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CHAPTER 19
1951 Guide
Table 10. Pkessubb Dbop in Duct Inches of Water per 100 Feet of Duel Length
EquitaLRKT
Total Pressure Drop m Duct (Ik. or Water)
Duct (Ft) 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20
35-44 45-64 56-54
76-84 86-04 96-104 106-114
115-189 130-149 150-169 170-189
190-314 316-239
866-889
890-384 326-374 876-434 . 426-474
476-684 636-674 676-636
0.1C
O.OS
0.0/
O.Of
0.13 0.1C
O.OS
0.07
0.15 0.19 0.16 0.09
0.1E 0.14 0.12 0.10
0.2C 0. II 0.1!
0.11
0.23 0.11 0.11
0.13
0.25 0.21
o.i:
0.14
0.28 0.22 0.11 0.1b
0.3C 0.2 0.21
0.17
0.33 0.2i
0.3! 0.19
0.35 0.28 0,21
0.30
0.38 0.3(1
0.25 0.21
0.23
0.48 0.34 0.28 0.34
0.45
0.86 0.80 0.26
0.38 0.38
0.29
O.Of o.os
0.04
0.04
0.06 0.06 0.01 0.06
0.08 0.07 0.0 0.05
0.09
0.01
o.o;
0.06
0.10
o.os
0.01 0.07
0.11 0.1( 0.01 0.08
0.13 0.11 0.1(
0.09
0.14 0.11 0.11 0.10
0.15 0.1! 0.11
0.11
0.16 0.1' 0.1!
0.12
0.18 0.K 0.14 0.13
0.19 0.11 0.15 0.14
0.15
0.21 0.19
0.15
0.23 0.30
0.16
0.17
0.18
0.03
0.03
0.03 0.03
0.04 0.04
0.03 0.03
0.05 0.0 0.04
0.03
0.06
0.05
O.Of
0.04
0.07 0.0b 0.05 0.04
0.08
o.o; O.Of
0.05
0.08 0.(7.
O.Of
0.06
0.09 O.Of
o.o:
0.06
0.10 O.Of O.Of
0.07
0.11
O.Of
O.Of
0.07
0.13 0.H 0.09 0.08
0.12 0.11 0.09 0.08
0.09
6.14
0.11 0.09
0.15
0.11 0.10
0.11
0.11
0.03 0.03
0.01
0.03 0.03 0.03
0.03
0.03
0.02
o.os
0.02
0.04 0.03 0.03 0.03
0.04 0.04 O.OS 0.03
0.05 0.04 0.04 0.03
0.05
0.05 0.04 0.04
0.06
0.05 0.04
0.04
0.06
0.05
0.05 0.04
0.07
O.Of
0.05 0.05
0.07 0.06 0.06 0.05
0.08 0.07 0.06 0.05
0.06
0.09 0.08
0.07 0.06
0.08 0.07
0.07
0.07
0.01 0.01 0.01 0.01
0.03 0.03 0.01 0.01
0.02 0.09 0.02 0.01
0.03 0.03 0.09 0.03
0.03 0.09 0.09 0.02
0.03 0.03
0.02 0.02
0.03 0.U3 0.03 0.03
0.04
o.na
0.03
0.03
0.04
0.03 0 03 0.03
0.04 0.04 0.03 0.03
0.05 0.04 0 04 0.03
0.05 0.04 0.04
0.03
0.04
0.06 0.05
0.04 0.04
0.06
0.05 0.04
0.04
0.05
0.01 0.01 0.01 0.01
0.01 .0.01
0.01
0.01 0.01
0.02 0.01 0.01
0.02
0.09 0.01
0.02 0.02
0.02
0.02 0.02
0.02
0.02
0.02 0.02
0.02 0.02
0.03
0.03 0.02
0.02
0.03
0.03 0.03
0.03 0.03 0.03
0.03
0.03 0.03
0.03
0.03 0.03
0.03
0.03
Equxta-
Total Pressure Drop nt Duct (Ik. op Water)
Dcct (Ft) 0.21 0.28 0.23 0.84 0.25 0.26 0.27 0.23 0.39 0.30 0.33 0.84 0.36 0.88 0.40 0.45 0.60
35-44 46-64 56-64 66-74
75-84 ' 85-04
95-1M 106-114
116-139 130-149
160-169 170-189
190-314 316-339 340-864 866-389
390-324 286-374 276-434 425-474
476-634 535-674 { 6/6-025
0.53 0.42
0.36 0.30
0.55 0.44
0.37 0.83
0.58 0.46 0.89 0.33
0.60
0.48
0.40 0.34
0.63
0.60 0.42 0.26
0.65 0.62
0.43 0.37
0.68 0.64
0.45 0.39
0.70 0.56 0.47 0.40
0.73 0.58 0.48
0.43
0.75 0.60 0.50 0.43
0.80 0.64 0.53
0.46
0.85
0.68 0.57 0.49
0.90 0.72
0.60
0.53
0.95 0.76 0.64 0.54
0.67 0.57
0.64
6.73
0.26 0.23 0.21 0.19
0.28 0.25 0.22
0.20
0.29
0.26 0.23 0.31
0.30 0.37
0.34 0.22
0.31 0.32 0.25 0.33
0.33 0.29
0.26 0.24
0.34 0.30 0.27 0.26
0.35 0.31 0.28
0.26
0 38 0.32
0.29 0.37
0.38 0.33 0.30
0.38
0.40 0.36
0.32
0.29
0.43 0.38 0.33 0.31
0.45 0.40 0.36 0.33
0.48 0.43
0.88 0.85
0.45 0.37
0.41
0.46
0.18 0.16 0.13
0.18
0.18 0.14
0.19 0.16 0.14
0.20 0.17 0.15
0.21
0.18 0.16
0.22 0.19 0.16
0.23 0.19 0.17
0.23 0.20
0.18
0.24 0.21
0.18
0,25 0.21 0.19
0.37 0,28
0.20
0.28 0.24 0.21
0.30 0.26
0.23
0.82
0.37 0.24
0.33
0.13 0.12 0.13 0.13 0.14 0.15 0.15 0.16 0.16 0.17 0.18 0.19 0.20 0.21 0.33 0.35 0.28
0.11 0.09 0.08 0.08
0.11 0.10 0.09
0.08
0.12 0.10 0.09 0.08
0.13 0.11 0.10 0.09
0.13 0.11 0.10 0.09
0.13 0.12 0.10 0.10
0.14 0.12 0.11 0.10
0.14
0.13 0.11 0.10
0.15 0.13 0.12
0.11
0.15 0.13 0.12
0.11
0.16 0.14
0.1S 0.12
0.17
0.15 0.14 0.12
0.18 0.16 0.15 0.18
0.19 0.17
0.14
0.20 0.18
0.15
0.16
0.18
0.07 0.06 0.06 0.05
0.07 0.06 0.06 0.05
0.08 0.07 0.06 0.05
O.OS
0.07
0.06
0.05
0.08 0.07
0.06 0.06
0.09 0.08 0.07 0.06
0.09 0.08 0.07 0.06
0.09 0.08 0.07 0.06
0.10 0.09 0.08 0.07
0.10 0.09
0,08 0.07
0.11
0.09 0.08 0.07
0.11
0.10 0.09 0.08
0.12 0.10 0.09 0.08
0.11
0.09 0.09
0.09
0.10
0.11
0.04 0.04 0.04
0.04
0.04 0.04
0.05 0.04
0.04
0.05 0.04
0.04
0.05 0.05 0.04
0.05
0.06 0.04
0.05 0.05
0.05
0.06 0.05 0.05
0.06 0.05
0.05
0.06 0.06
0.05
0.06 0.06
0.05
0.07 0.07 0.06
0.07 0.07 0.06
0.08 0.07 0.08
0.07 0.07
0.08
0.08
are installed through these hangers and metal lath is attached to the rods.
The lath is then plastered to a thickness of f in., making a completely sealed air space above the ceiling. Warm air is delivered to this sealed space through a standard warm air duct, installed in the usual manner. The air is then circulated over the entire ceiling being guided by sheet-metal baffles. After the air has passed over the ceiling, it is returned to the fur nace through a return air duct for reheating. The system is closed, and no air is introduced into the heated space from the panel. (See also Chapter, 23, Panel Heating.)
Forced Warm Air Systems
455
. Because a warm air ceiling panel system involves a different;:type of ceiling construction, its installation is practically limited to new construc tion. Only automatically-fired and thermostatically-controlled furnaceblower units may be used with this system. The standard automatic heating controls consisting of a room thermostat, temperature limit con trol, blower control (fan switch), and primary control are all that are re quired. While warm air ceiling panel heating has particular advantages in one-story utility room houses, it can be just as effectively installed in
one- and two-stoiy houses with basements.
Complete design and installation procedure is given in Manual 7-A of the National Warm Air Heating and Air Conditioning Association. . This procedure is given in the following general outline:
1. Calculate the design heat losses from individual spaces in the structure. (See Chapter 11.) a. Determine furnace size from tables in Manual 7-A. b. Determine fan (blower) size from tables in Manual 7-A.
2. Lay out the ceiling panel design, locating panel inlets and outlets, and make a tentative drawing of supply and return system.
3. Measure actual length of warm air travel from plenum to discharge into panel.
4. Determine equivalent length of fittings, including panel inlet connection to panel, from values given in Manual 7-A.
5. Select duct sizes required from capacity tables and check minimum allowable
panel area.
6. Measure actual length of return air travel from warm air outlet into panel to
connection at blower cabinet.
-
7. Determine equivalent length of. fittings and turns from warm air outlet into
panel to blower inlet.
8. Add actual lengths and equivalent lengths, determine width of space 31 in: deep that may be used, and find the size of the return air duct required.
9. Determine both warm air and return air trunk sizes.
WARM AIR PERIMETER SYSTEMS
Warm air perimeter heating systems are. combination panel and convec tion systems that have been developed especially for structures having a concrete-slab -floor laid on the ground. Warm air is delivered from the furnace-blower unit through round ducts imbedded in the concrete floor slab to a continuous duct along the outer perimeter of the house just in side the exterior walls. The warm air is introduced into the rooms through registers which are connected to the ducts, and are located under windows or at the points of greatest heat loss. The return air is collected through one or, more grilles located high on the interior sidewalls or in the ceiling. : .