Wet Bulb Temperature Homework Help

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Wet Bulb Temperature

The wet bulb temperature is kind of temperature measurement that reflects the physical properties of a system with a blend of a gas and a vapor, commonly air and water vapor. Wet bulb temperature is the lowest temperature which can be arrived at by the vaporization of water only. It is the temperature one feels when one’s skin is wet and is exposed to moving air. Unlike dry bulb temperature, wet bulb temperature is an indication of the amount of moisture in the air. There are many technical meanings wet bulb temperature can have.

Adiabatic Saturation

Thermodynamic wet bulb temperature which is volume of air would have if cooled adiabatically to saturation at regular pressure by vaporization of water into it, every latent heat being supplied by the volume of air. And the temperature reads from a wet bulb temperature. Adiabatic kind is volume of air cooled adiabatically to saturation and then compressed adiabatically to the original pressure in moist-adiabatic process.

The thermodynamic wet bulb temperature is the least amount temperature which may be attained by merely evaporating cooling water wetted and ventilated surface. In a given parcel air at familiar pressure and dry bulb temperature, the thermodynamic relates to specific values of corresponding humidity, dew point temperature and other properties.

Dew Point Temperature

For dry air, which less than saturated the wet bulb temperature is lower than the dry bulb temperature because of evaporative cooling. The better the difference the wet and dry bulb temperatures, the drier the air and lower the relative humidity. The dew point temperature is the temperature where in, the ambient air must cool to reach 100% relative humidity where condensate and rain form and conversely the wet bulb temperature increases to meet on the dry bulb temperature.

Reduced Dehumidification Load

When perspiration is reserved the cooling of the body happens as the wet bulb temperature of the surrounding air increases in summer. Other mechanisms may be at work in winter if there is validity to the notion of a humid or damp cold. Lower wet bulb temperature which relate with drier air in summer can translate to energy savings in air-conditioned buildings because two factors like reduced dehumidification load for ventilation air and increased efficiency of cooling towers. These are measured using a thermometer which has its bulb wrapped in cloth known as a sock that is kept wet with water through wicking action. That instrument is referred to thermometer.

Questions:

  • Define wet bulb temperature.
  • State the importance of wet bulb temperature.



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