How does altitude affect psychrometric calculations, and how does a calculator account for this?

Altitude has a significant impact on psychrometric calculations because atmospheric pressure decreases with increasing elevation. This affects the calculation of psychrometric properties such as dew point temperature and enthalpy. A psychrometric calculator accounts for altitude by using barometric pressure correction factors or by allowing users to input elevation above sea level. By accurately accounting for altitude, the calculator provides reliable and accurate results for HVAC system design and operation.