FieldengThermal & HVAC
Psychrometric State
Dew point, humidity ratio, enthalpy, and density from dry bulb, RH, and pressure. Composes THERM-11–14.
Thermal & HVAC
Dew point, humidity ratio, enthalpy, and density from dry bulb, RH, and pressure. Composes THERM-11–14.
App id: THERM-15. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
Tdb + RH + P → Tdp, W, h, ρInputs
| Name | Unit |
|---|---|
| Dry-bulb temperature (camera) | C |
| Relative humidity | % |
| Barometric pressure (optional) | kPa |
Outputs
| Name | Unit |
|---|---|
| Dew point (hero result) | C |
| Humidity ratio | kg/kg |
| Specific enthalpy | kJ/kg |
| Density | kg/m3 |
| Vapor pressure | Pa |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
| When | Observation | Severity |
|---|---|---|
RH > 0.7 | High relative humidity | caution |
RH < 0.2 | Low relative humidity | info |
Assumptions
- Leave pressure blank for 101.325 kPa.
Provenance
- Same Magnus and ideal-gas constants as the dedicated tools.