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18-06-2007, 04:09 PM #1
Re: Evaporating / condensing temperatures
Also I thank you for good discussion Mohamed.
CheersEven Einstein Asked Questions
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19-06-2007, 03:48 AM #2
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19-06-2007, 05:06 AM #3
Re: Evaporating / condensing temperatures
The values you reference for 1%, 3% & 5% were revised sometime ago by ASHRAE. The new occurence values are 0.4%, 1%, & 2% and account for the percentage of annual hours where that value is exceeded.
So, this equates to:
0.4% X 8760 hours = 35.4 hours
1.0% X 8760 hours = 87.6 hours
2.0% X 8760 hours = 175.2 hours
In some locations the dry bulb temperature may not vary much, in other locations it will.
I'm late to this discussion, but I'm sure it has been lively with lana participating.If all else fails, ask for help.
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19-06-2007, 05:10 AM #4
Re: Evaporating / condensing temperatures
Thank you US Iceman for clarifying the percentages.
CheersEven Einstein Asked Questions
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19-06-2007, 07:55 AM #5
Re: Evaporating / condensing temperatures
Ok thank you for this data, i have seen it on http://www.microcool.com/cooling/bro...PreCooling.pdf.
However, i am so happy that i was a reason of correcting the common perception of the fellows for using maximum ambient temperature occurred in the year as the design temperature for the condenser without looking to something named the frequency occurrence. Regardless of these new values i do believe as u mentioned each location has its specifications.
Cheers
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19-06-2007, 01:31 PM #6
Re: Evaporating / condensing temperatures
Hi there,
In Persian Gulf area we have minimum of three months extreme temperatures between 45 to 55°C.
3 months x 30 days x 24 hrs = 2160 hrs
This is way more than 1% occurrence.
CheersEven Einstein Asked Questions
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