ASHRAE Journal - November 2014 - 60
COLUMN HVAC APPLICATIONS
15 ft
15 ft
15 ft
15 ft
15 ft
4 ft
4 ft
15 ft
15 ft
15 ft
15 ft
15 ft
4 ft
15 ft
15 ft
Offset, 4 ft Spaced Beams
120 ft2 Coverage per Beam
(200 cfm × 10 DT ) / 120 ft2 = 16 Btu/h·ft2 (4.7 W/ft2)
Assuming 1,000 Btu/h per Linear Foot
2 ft
15 ft
FIGURE 4 Staggered beams.
2 ft
15 ft
15 ft
25 ft
25 ft
25 ft
25 ft
25 ft
25 ft
2 ft Spaced Beams
180 ft2 Coverage per Beam
(200 cfm × 10 DT )/180 ft2 = 11 Btu/h·ft2 (3.2 W/ft2)
Assuming 1,000 Btu/h per Linear Foot
FIGURE 3 Two foot spaced beams.
are able to calculate the effective cfm/foot. Then, referencing that value in the performance data for a two-way
throw of a similar linear slot diffuser (at that flow rate),
we can see if a collision is likely. Typically, the goal is for
the 50 fpm (0.25 m/s) throw values to be no greater than
one-half of the diffuser spacing (L) plus the distance
from 6 ft (1.8 m) to the ceiling as shown in Figure 1.
Let's run through an example for a chilled beam that
produces 500 Btu/h·ft (481 W/ft).
First, we reference the performance data of a linear
slot diffuser with similar unit specifications.
* 4 ft (1.2 m) long unit
* 2 in. (51 mm) slots (quantity two)
* Two-way throw pattern
* 50 cfm/ft (77 L/s·m)
The catalog data we reference for this example states
that the throw to 50 fpm (0.25 m/s) is 18 ft (5.5 m).
What this means is that if we have a 9 ft (2.7 m) ceiling,
60
ASHRAE JOURNAL
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N OVEM BER 2014
4 ft
25 ft
4 ft
25 ft
25 ft
High Capacity, 4 ft Spaced Beams
400 ft2 Coverage per Beam
(400 cfm × 10 DT ) / 400 ft2 = 10 Btu/h·ft2 (2.9 W/ft2)
Assuming 1,000 Btu/h per Linear Foot
FIGURE 5 High capacity beams.
the chilled beams would have to be 30 ft (9 m) apart to
avoid collisions of the opposing airstreams entering into the
occupied zone. So, if we take a a 4 ft (1.2 m) chilled beam on
30 ft (9 m) centers that produces 2,000 Btu/h and has a 4 ft
ASHRAE Journal - November 2014
Table of Contents for the Digital Edition of ASHRAE Journal - November 2014
Contents
ASHRAE Journal - November 2014 - Cover1
ASHRAE Journal - November 2014 - Cover2
ASHRAE Journal - November 2014 - 1
ASHRAE Journal - November 2014 - 2
ASHRAE Journal - November 2014 - Contents
ASHRAE Journal - November 2014 - 4
ASHRAE Journal - November 2014 - 5
ASHRAE Journal - November 2014 - 6
ASHRAE Journal - November 2014 - 7
ASHRAE Journal - November 2014 - 8
ASHRAE Journal - November 2014 - 9
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ASHRAE Journal - November 2014 - 11
ASHRAE Journal - November 2014 - 12
ASHRAE Journal - November 2014 - 13
ASHRAE Journal - November 2014 - 14
ASHRAE Journal - November 2014 - 15
ASHRAE Journal - November 2014 - 16
ASHRAE Journal - November 2014 - 17
ASHRAE Journal - November 2014 - 18
ASHRAE Journal - November 2014 - 19
ASHRAE Journal - November 2014 - 20
ASHRAE Journal - November 2014 - 21
ASHRAE Journal - November 2014 - 22
ASHRAE Journal - November 2014 - 23
ASHRAE Journal - November 2014 - 24
ASHRAE Journal - November 2014 - 25
ASHRAE Journal - November 2014 - 26
ASHRAE Journal - November 2014 - 27
ASHRAE Journal - November 2014 - 28
ASHRAE Journal - November 2014 - 29
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ASHRAE Journal - November 2014 - 31
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ASHRAE Journal - November 2014 - 35
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ASHRAE Journal - November 2014 - 37
ASHRAE Journal - November 2014 - 38
ASHRAE Journal - November 2014 - 39
ASHRAE Journal - November 2014 - 40
ASHRAE Journal - November 2014 - 41
ASHRAE Journal - November 2014 - 42
ASHRAE Journal - November 2014 - 43
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ASHRAE Journal - November 2014 - 49
ASHRAE Journal - November 2014 - 50
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