Wet-bulb temperature is the lowest temperature that can be reached by the evaporation of water at ambient conditions, bu

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Wet Bulb Temperature Is The Lowest Temperature That Can Be Reached By The Evaporation Of Water At Ambient Conditions Bu 1 (103.5 KiB) Viewed 22 times

Wet-bulb temperature is the lowest temperature that can be reached by the evaporation of water at ambient conditions, but the wet bulb temperature can be measured by covering a thermometer in a water-soaked cloth (using distilled water for better accuracy) in an airflow. The mass transfer of water from the cloth can be described by convective flux: NA = K(Csat - Coo) where Csat is the water concentration at the cloth and co the water concentration in the bulk and an energy balance describes the heat flux from the cloth to the ambient temperature: q= =h(Ti - T∞) where T; is the temperature at the cloth and T in the bulk These processes are coupled by the latent heat of evaporation so: NAAHvap = -9 If the thermometer reads 15C (wet bulb temperature, T₁ = 15C), use the heat-mass transfer analogies to determine the ambient temperature (T) in the room in C, assuming that the air is dry (c∞ = 0). The saturated vapor pressure of water is, psat = 2.34kPa at 15 C, the specific heat capacity of water is 4182J/kgK, the latent heat is AH vap = 2.2.106 J/kg. The Sc/Pr ratio can be assumed to be 0.85. Make sure to keep track of your units. -