Phone: 303-431-1180

Carlson Heat Exchanger Fluid to Fluid Sizing Calculator

This calculator will help determine which exchanger has enough heat transfer capacity for your system.

Usage:
When BTU requirement is known (most applications):
- enter the BTU requirement
- Temp In, Temp Out, and GPM are shaded for Hot and Cold
- enter two of the three shaded portions for Hot
- enter two of the three shaded portions for Cold
- enter Specific Heat & Specific Gravity for both Hot & Cold

When BTU requirement is not known (specific fluid conditions):
- Temp In, Temp Out, and GPM are shaded for Hot and Cold
- enter all three shaded portions for either Hot or Cold
- enter two of the three shaded portions for the other
- enter Specific Heat & Specific Gravity for both Hot & Cold
BTU requirement:
Hot Fluid
Temp In (F)
Temp Out (F)
GPM
Specific Heat
Specific Gravity
Calculated
Temp Out
211.54
Cold Fluid
Temp In (F)
Temp Out (F)
GPM
Specific Heat
Specific Gravity
Calculated
BTU
12417.96
Note: this calculator uses a model for each exchanger based on test results from our flow lab. While we have done as much as possible to ensure accurate results, ultimately this calculator is a guide and actual results can not be guaranteed.
Model Heat Transfer Capacity Hot pressure drop
(ft of head)
Cold pressure drop
(ft of head)
Model 2 ST 194% 12.87 0.07
Model 3.5 ST 140% 9.8 0.04
Model 5 ST 110% 11.69 0.05
Model 7.5 ST 68% 3.72 0.01
Model 10 ST 52% 1.89 0.01
Model 15 ST 36% 1.21 0
Model 20 ST 29% 0.87 0

Note: It is not recommended to run an exchanger over 90% Heat Transfer Capacity.
Key: ACCEPTABLE NEAR LIMIT OUT OF RANGE