Evaporative coolers: maintain FE and stay cool?
#11
Re: Evaporative coolers: maintain FE and stay cool?
How do you determine the relative humidity of your area? Can you check any weather sites online that report it, or do you need to buy some sort of humidity reader? Maybe it's worth checking out the humidity range of my area before spending the money on an evaporative cooler. I do not live that far from the coast, so one would think it would be more humid than in west Texas.
#12
Re: Evaporative coolers: maintain FE and stay cool?
Jginaz' suggestion of using a 65 oF dewpoint cutoff is a reasonable single factor, and allows us to avoid some complications. To see what US local dewpoints are today, see the second map here:
http://www.liveweatherimages.org/data/imag338.html
DAS
http://www.liveweatherimages.org/data/imag338.html
DAS
#14
Re: Evaporative coolers: maintain FE and stay cool?
Originally Posted by Tochatihu
Jginaz' suggestion of using a 65 oF dewpoint cutoff is a reasonable single factor, and allows us to avoid some complications. To see what US local dewpoints are today, see the second map here:
http://www.liveweatherimages.org/data/imag338.html
http://www.liveweatherimages.org/data/imag338.html
A word of warning: The dew point is the temperature to which the air must be cooled to reach saturation (100% humidity) without adding any water vapor. The wet bulb temperature is how low you can cool the air (reaching saturation) by adding water vapor. The wet bulb is always warmer than the dew point but cooler than the temperature (unless humidity is 100%, in which case all 3 values are the same). So evaporative cooling will at best get you down to the WB, not the DP.
#15
Re: Evaporative coolers: maintain FE and stay cool?
Originally Posted by tanstaafl14
So evaporative cooling will at best get you down to the WB, not the DP.
JG
#16
Re: Evaporative coolers: maintain FE and stay cool?
Does this link work OK for others? It redirects to the dew point map I had in mind
http://weather.unisys.com/surface/sfc_con_dewp.html
DAS
http://weather.unisys.com/surface/sfc_con_dewp.html
DAS
#17
Re: Evaporative coolers: maintain FE and stay cool?
Originally Posted by jginaz
Since the DP is the only thing the nightly weather droids give out we must depend on that for cooler use judgement.
More useless information available on request.....
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