Pad Fan Cooling Degree Drop
Model pad cooling from supplied wet bulb and saturation efficiency, then downstream sensible reheating; not a duplicate wet-bulb psychrometric solver or cooling-performance guarantee.
Description
Evaporative pads cool toward the inlet wet-bulb temperature according to their saturation efficiency.
Evaporative pads cool toward the inlet wet-bulb temperature according to their saturation efficiency. Heat gained downstream can offset that initial cooling.1
Model pad cooling from supplied wet bulb and saturation efficiency, then downstream sensible reheating; not a duplicate wet-bulb psychrometric solver or cooling-performance guarantee.
When to use Pad Fan Cooling Degree Drop
Use this tool to model pad cooling from supplied wet bulb and saturation efficiency, then downstream sensible reheating; not a duplicate wet-bulb psychrometric solver or cooling-performance guarantee.
Prepare the plant, nutrient, light or scheduling measurements for the intended crop and period. Keep paired records aligned and confirm units and supplied target values.
How to use Pad Fan Cooling Degree Drop and understand its results
- Prepare the plant, nutrient, light or scheduling measurements for the intended crop and period. Keep paired records aligned and confirm units and supplied target values.
- Enter inletDryBulbC, inletWetBulbC, padSaturationEfficiencyFraction, downstreamSensibleHeatWatts, airMassFlowKgPerSecond, airSpecificHeatJPerKgK using the field table and calculation rules, then run the tool.
- Read padOutletTemperatureC, occupiedZoneTemperatureC, netTemperatureDropC. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| inletDryBulbC | Inlet dry bulb c | number | Required |
| inletWetBulbC | Inlet wet bulb c | number | Required |
| padSaturationEfficiencyFraction | Pad saturation efficiency fraction | number | Required |
| downstreamSensibleHeatWatts | Downstream sensible heat watts | number | Required |
| airMassFlowKgPerSecond | Air mass flow kg per second | number | Required |
| airSpecificHeatJPerKgK | Air specific heat j per kg k | number | Required |
Enter wet bulb no greater than dry bulb, efficiency in [0,1], positive air mass flow and heat capacity, and nonnegative downstream sensible heat. Return pad and zone temperatures and signed inlet-minus-zone drop; reheating can make the drop negative.
pad outlet=inlet dry bulb−efficiency(dry bulb−wet bulb); zone=outlet+heat/(air mass flow × heat capacity) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| padOutletTemperatureC | Pad outlet temperature c | number |
| occupiedZoneTemperatureC | Occupied zone temperature c | number |
| netTemperatureDropC | Net temperature drop c | number |
{
"input": {
"inletDryBulbC": 35,
"inletWetBulbC": 25,
"padSaturationEfficiencyFraction": 0.8,
"downstreamSensibleHeatWatts": 1000,
"airMassFlowKgPerSecond": 1,
"airSpecificHeatJPerKgK": 1000
},
"output": {
"padOutletTemperatureC": 27,
"occupiedZoneTemperatureC": 28,
"netTemperatureDropC": 7
}
}Limitations and assumptions
Wet-bulb temperature is supplied rather than solved. Ventilation design and actual cooling performance are not certified.
Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Fogging On Time Humidity Band: Calculate constant-temperature closed-room fog on-time from a supplied saturation vapor density, evaporation yield and other vapor sources; ventilation, condensation and cooling are excluded, so not a controller setting guarantee. For a complementary task, use Wind Chill Climatological Monthly Mean: Summarize caller observed month exposure using existing wind-chill equation only where T≤10 C and wind≥4.8 km/h; invalid observations are excluded with coverage, not computed from monthly mean weather or certified cold safety.
References
-
Pad Fan Cooling Degree Drop — tool.io
Similar or alternative tools
- Fogging On Time Humidity Band
Calculate constant-temperature closed-room fog on-time from a supplied saturation vapor density, evaporation yield and other vapor sources; ventilation, condensation and cooling are excluded, so not a controller setting guarantee.
- Wind Chill Climatological Monthly Mean
Summarize caller observed month exposure using existing wind-chill equation only where T≤10 C and wind≥4.8 km/h; invalid observations are excluded with coverage, not computed from monthly mean weather or certified cold safety.