Question

The humidity at dry-bulb temperature of 20^oC is 40% and the humidity at dry-bulb temperature of 25^oC is 25%, what is the slope of adiabatic cooling line?

(a) 0.03

(b) -0.03

(c) 0.05

(d) -0.05

The question was asked during an online exam.

Enquiry is from Degrees of Freedom Analysis in Steady-State Process topic in chapter Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

Answer 1

Correct choice is (b) -0.03

Explanation: Slope of adiabatic cooling line = (0.4 – 0.25)/(20 – 25) = -0.03.