The following table is used to determine an initial heat exchanger size. A final selection should be made with the manufacturer’s computer selection software. DECTRA CORPORATION can provide this se rvice.
WATER TO WATER FLAT PLATE HEAT EXCHANGERS
MODEL
BTUH
REQ'D FITTING
PRESSURE DROP, FEET
STRAINER
MIN
OUTPUT
GPM
SIZE
SIZE
PIPE SIZE
5 X 12 - 16 5 X 12 - 24 5 X 12 - 30 5 X 12 - 36 5 X 12 - 50 5 X 12 - 50 10 X 20 - 30
25,000 50,000 75,000 100,000 125,000 150,000 200,000
3 5
3/4"
3' 3' 3'
3/4"
3/4"
1" 1"
1" 1"
1"
7.5
1 1/4" 1 1/4" 1 1/4" 1 1/4" 1 1/2"
10
1 1/4" 1 1/4" 1 1/4" 1 1/2"
4.5' 3.5'
1 1/4" 1 1/4" 1 1/4" 1 1/2"
12.5
15 20
4' 6'
BTUH output listed is based on a 10°F approach temperature (see diagram for explanation):
All unites are pipe counter flow according to their manufacturer’s rules. BTUH output listed assumes no glycol. Larger heat exchanger sizes and units for use with glycol based systems are available. Contact the DECTRA CORPORATION for specific sizing.
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Hydronic System Design Manual ©DECTRA CORPORATION - March 2013
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