Moisture Removed by Grain Depression
Water a dehumidifier removes per hour and over the run, from its grain depression and airflow.
Example
You enter
- Process airflow (CFM) 250
- Inlet grains-per-pound (GPP) 90
- Outlet grains-per-pound (GPP) 50
- Run hours 24
You get
- Water removal rate 6.43
- Total water over run 18.5 gal
Details, formula, and sources
Water-removal rate (lb/hr, pints/hr) and total water over the run from a dehumidifier's measured inlet/outlet grain depression and process airflow - an in-situ performance check.
dG = inlet_GPP - outlet_GPP; mass-air = CFM*60/13.33 lb-dry-air/hr; water lb/hr = mass-air * dG / 7000 (7000 grains/lb); gal = lb/hr * hours / 8.345.
First-principles psychrometric mass balance (7000 grains/lb; ~13.33 ft3/lb dry air); IICRC S500 grain-depression field method, by name.
Public psychrometric constants; IICRC S500 governs the drying plan.
Estimate. AHJ and licensed professional govern.
Field names used by the API: cfm, inlet_gpp, outlet_gpp, hours, water_lb_hr, water_gal
- Humid volume ~13.33 ft3/lb dry air at standard conditionspsychrometric chart