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10 Ιουν 2005 · I worked for a while to come up with a feasible formula working between 0 and 100°F to provide an enthalpy value based on dry bulb temperature and relative humidity. It uses a polynomial model to match Psat to temperature in order to avoid referencing a table (I wanted it to be able to work by a simple math equation...no steps.)
Abridged sample of psychrometric chart is shown below: Example: An air-conditioned room at sea level has an indoor design temperature of 75°F and a relative humidity of 50%. Determine the humidity ratio, enthalpy, density, dew point, and thermodynamic wet bulb temperature of the indoor air at design condition.
HVAC psychrometric equations are mathematical expressions that relate the different psychrometric properties of moist air, such as dry-bulb temperature, wet-bulb temperature, dew point temperature, relative humidity, humidity ratio, specific volume, and enthalpy.
D. Determine inside and outside design temperatures—assume inside space temper-ature has dropped to the outside design temperature because doors have been open for an extended period of time. E. Use sensible heat equation to determine heating requirement using CFM and inside and outside design temperatures determined above. BHP3φ M/D EFF.
21 Ιουλ 2021 · It is a comprehensive spreadsheet for calculating the ventilation outdoor intake in HVAC systems. the excel program includes all ventilation calculation formulas gathered and designed to obtain the outdoor air intake and the air change per hour rates for every space.
25 Απρ 2022 · Learn how to calculate the sensible and latent heat transfer for air using this simple formula for Btu's, CFM and Delta Enthalpy.
CLTD (cooling load temperature difference), SCL (solar cooling load factor), and CLF (cooling load factor): all include the effect of (1) time-lag in conductive heat gain through opaque exterior surfaces and (2) time delay by thermal storage in converting radiant heat gain to cooling load.
