Question

QUESTION ONE gw constitrat a) State Dalton's law of partial pressures be taken to occupy the entre vchure. (2 marks) b) When are the dry-bulb and dew temperatures identical? (2 marks) c) Define the dew point temperature. (2 marks) The reaperture d) Moist air at 20°C, 1 bar, 43% relative humidity and a volumetric flow rate of 900 m/h enters a control volume at steady state and flows along a surface maintained at 65 °C, through which heat transfer occurs. Liquid water at 20 °C is injected at a rate of 5kg/h and evaporates into the flowing stream. For the control volume, Wcv=0, and kinetic and potential energy effects are negligible. Moist air exits at 32 °C, 1 bar. With the help of the psychrometric chart provided, determine the rate of heat transfer, in kW. (14 marks) [20 marks)

Part 3 is the total cooling load at the bottom

Answer 1

a) Dalton's law:
For a non reacting mixture of gasses Dalton law states that the total pressure exerted by the mixture is equal to the sum of partial pressure of individual gasses.

Thus can be written as
P = p1+p2+p3+p4....
Here P = total pressure of mixture. And p1 ,p2 ,p3 ,p4 etc are partial pressure of individual gasses.

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