The typical formula for temperature drop in evaporative cooling models

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Discussion Overview

The discussion revolves around calculating the maximum evaporation and temperature drop in air flow when using a cotton sock as a wick in evaporative cooling models. Participants explore the relevant formulas and resources related to wet-bulb temperature and psychrometric charts.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant inquires about the typical formula for temperature drop in evaporative cooling models, specifically in the context of using a cotton sock as a wick.
  • Another participant suggests that the wet-bulb temperature is the key value to consider, indicating it is derived from dry bulb temperature and humidity, but does not provide a specific formula.
  • A request for resources on psych charts and wet-bulb temperature is made, highlighting a need for accessible information.
  • A suggestion is made to use Trane's freeware software and a link to find psychrometric charts through a Google search is provided.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a specific formula for temperature drop, and multiple approaches and resources are suggested without resolving the inquiry.

Contextual Notes

Participants reference the wet-bulb temperature and its relationship to humidity and dry bulb temperature, but do not clarify the assumptions or limitations of their suggestions.

Who May Find This Useful

This discussion may be useful for individuals interested in evaporative cooling, psychrometric analysis, or those seeking resources for temperature calculations in HVAC applications.

T.Engineer
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By passing warm air through a cotton sock acting as a wick immersed in water, how can I calculate the maximum evaporation to achieve the gratest temperature drop in the air flow? What is the typical formula for temperature drop in evaporative cooling models?
 
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I'm not sure if there is an easy formula for it, but the number you are looking for is simply wet-bulb temperature. You can read it off a psych chart. It is a function of dry bulb temp and humidity.

Here's some info on the subject: http://www.srh.noaa.gov/elp/wxcalc/formulas/wetBulbTdFromRh.html
 
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thanks for your replying. Can you tell me any websites that will provide me with psych charts , wet-bulb tempreture and dry bulb tempreture and Humidity? I mean free download.
Thanks a lot.
 

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