ME 113 Homework Set 12 solution S11

ME 113 Homework Set 12 solution S11 - ME 113 Homework Set...

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ME 113 Homework Set 12 All problems are all solutions except for one are from Cengel, 6 th edition. Latent heat is the energy released as water vapor condenses on cold surfaces, or the energy absorbed from a warm surface as liquid water evaporates. The latent heat loss from a human body increases as ( a ) the skin wetness increases and ( b ) the relative humidity of the environment decreases. The rate of evaporation from the body is related to the rate of latent heat loss by Q m h fg latent vapor = where h fg is the latent heat of vaporization of water at the skin temperature. Air enters a cooling section at a specified pressure, temperature, velocity, and relative humidity. The exit temperature, the exit relative humidity of the air, and the exit velocity are to be determined. Assumptions 1 This is a steady-flow process and thus the mass flow rate of dry air remains constant during the entire process ( ) m m m a a a 1 2 = = . 2 Dry air and water vapor are ideal gases. 3 The kinetic and potential energy changes are negligible. Analysis ( a ) The amount of moisture in the air remains constant ( ϖ 1 = 2 ) as it flows through the cooling section since the process involves no humidification or
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ME 113 Homework Set 12 solution S11 - ME 113 Homework Set...

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