PE Mechanical HVAC Practice Questions - PE Mechanical HVAC And Refrigeration Exam

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Air at 75°F DBT and 50% RH has a humidity ratio of approximately 0.00925 lb_w/lb_da and an enthalpy of about 28.1 BTU/lb_da. If this air is sensibly heated to 95°F (no moisture added), what happens to the relative humidity?

RH increases because enthalpy rose RH stays the same because humidity ratio is unchanged RH decreases because saturation pressure rose while vapor pressure stayed the same RH drops to zero because the air is heated

Correct Answer:

RH decreases because saturation pressure rose while vapor pressure stayed the same

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