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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 Cold pressure drop
ft of head psi ft of head psi
Model 2 ST 334% 12.87 5.58 0.07 0.03
Model 3.5 ST 316% 9.8 4.25 0.04 0.02
Model 5 ST 287% 8.71 3.77 0.05 0.02
Model 7.5 ST 293% 3.72 1.61 0.01 0.01
Model 10 ST 322% 1.89 0.82 0.01 0.01
Model 15 ST 285% 1.21 0.53 0 0
Model 20 ST 266% 0.87 0.38 0 0
Model 30 ST 214% 0.82 0.35 0.01 0

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