Moist Air Enthalpy Calculator
The Moist Air Enthalpy Calculator is a psychrometric tool used to determine the total heat content (enthalpy) and moisture content (humidity ratio) of moist air. Enthalpy combines both sensible heat (related to temperature) and latent heat (related to moisture). Inputs typically include dry bulb temperature and relative humidity. The results, enthalpy (BTU/lb of dry air) and humidity ratio (lb of water/lb of dry air), are crucial for HVAC load calculations, coil performance analysis, and understanding air conditioning processes. This calculator generally uses approximate psychrometric formulas assuming standard atmospheric pressure.
Using Enthalpy in Load Calculations: Enthalpy simplifies the calculation of total heat added or removed from air. The change in enthalpy (Δh) between two air states directly relates to the total heat change. The formula Q_total (BTU/hr) ≈ 4.5 × CFM × Δh is a common and powerful tool for HVAC engineers to quickly assess total loads across coils, air handlers, or entire buildings when airflow and air state points (and thus enthalpies) are known.
Psychrometric calculations can be complex. This tool uses common approximations. For high precision, especially at extreme conditions or different altitudes (pressures), consult detailed psychrometric charts or specialized software. Results are for general estimation.