What is the Enthalpy when the Dry Bulb Temperature is 50°F and the Relative Humidity is 30%?

To find the enthalpy when given the dry bulb temperature and relative humidity, it is important to understand the relationship between these two parameters and how they relate to the psychrometric properties of air.

At a dry bulb temperature of 50°F and a relative humidity of 30%, we can refer to a psychrometric chart or calculate the enthalpy using appropriate formulas. Enthalpy in the context of air is a measure that combines the sensible heat (which is related to the temperature) and the latent heat (which is related to the moisture in the air).

The sensible heat corresponds to the temperature of the air, and the latent heat depends on the moisture content, which is influenced by relative humidity. At 50°F, when relative humidity is at 30%, the mixture of water vapor in the air has a relatively low moisture content, resulting in a specific enthalpy value that combines these factors.

Calculating or looking up the values, the correct enthalpy for this condition turns out to be 14.5 BTU's/lb. This value takes into account both the heat content from the temperature and the lower moisture content associated with the relative humidity of 30%.

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