GATE Agricultural - GATE 2017-2018 Questions and Answers

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Specific heat capacity of dry air and water vapour are 1.005 and 1.88 kJ kg^-1 K^-1, respectively. In an energy conserving system, 1 kg s^-1 air at 30⁰C with constant absolute humidity of 0.02 kg water (kg dry air)^-1 is heated up to 65⁰C. Water at the wet bulb temperature of air is then sprayed into the air so that the final temperature of the air-water vapour mixture is 40⁰C. Latent heat of vapourization of water at 70⁰C and 40⁰C are 2334 and 2407 kJ kg^-1, respectively.

The absolute humidity of the exhaust air from the spray chamber in kg water (kg dry air)^-1 is

0.027

0.029

0.031

0.033

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