Latent Heat Load Calculator
Moisture removal load from airflow and grain difference.
Enter your values
ⓘ Live results
Results
- Latent load
- 20,400 BTU/h
- In tons
- 1.7
- Water removed
- 19.4 pints/hour
- In kW
- 5.98
Quick answer
Latent load equals 0.68 times CFM times the grains of moisture removed per pound of air.
BTU/h = 0.68 x CFM x Δgrains
How to use the Latent Heat Load Calculator
- 1Measure grains of moisture entering and leaving the coil with a psychrometric app.
- 2Enter airflow and the grain difference.
- 3Compare against the equipment's rated latent capacity.
Worked example
Using the values the calculator loads with:
Inputs
- Airflow1200 CFM
- Grain difference25 gr/lb
Results
- Latent load20,400 BTU/h
- In tons1.7
- Water removed19.4 pints/hour
- In kW5.98
Frequently asked questions
Typical grain drop?
A well-performing residential coil removes 15-30 grains per pound.
Low latent removal?
Usually too much airflow across the coil or an oversized system that short cycles.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.