Re: [EnergyPlus_Support] calculating DryBulb Temp

[Marcus <jones.0bj3@xxxxxxxxx>]

Haniyeh; 

Wetbulb temperature is not easy to calculate from dry-bulb and relative humdity. It requires an iterative solver or tables. You will additionally need to assume the atmospheric pressure.  I can recommend an excel plug-in which has functions for most psychrometric properties; http://www.linric.com/pfdown.htm. Or you can derive your own curves or algorithm. 

Best regards,

Marcus
-- 
Marcus Jones,  M.Sc., LEED®AP BD+C

Freelance energy consultant
Vienna, Austria

On Mon, Aug 1, 2011 at 11:53 PM, Chuck Khuen <virtualweather@xxxxxxxxx> wrote:

 

I think so, because you have relative humidity (relhum-hmean) which I expect  = mean relative humidity for the last hour.

Chuck

From: Haniyeh Karbasi <abroon_art@xxxxxxxxx>

To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>

Sent: Monday, August 1, 2011 5:46 AM

Subject: Re: [EnergyPlus_Support] calculating DryBulb Temp

 

Thanks.

So, is there any possibility to calculate WetBulb Temperature from these data?

precip-htotal ( mm/hour)

temp-hmean  (degC)

vapourpressure-hmean  (hpa)

relhum-hmean  ( %)

sunshine-htotal (hours)
Thanks

 

 

From: Chuck Khuen <virtualweather@xxxxxxxxx>
To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Sunday, 31 July 2011, 19:22
Subject: Re: [EnergyPlus_Support] calculating DryBulb Temp

 

The temp-hmean is most likely the hourly mean dry bulb temperature for the last hour...nothing else on the list will help you.

 

Chuck, Weather Analytics

From: Haniyeh Karbasi <abroon_art@xxxxxxxxx>
To: "energyplus_support@xxxxxxxxxxxxxxx" <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Sunday, July 31, 2011 9:56 AM
Subject: [EnergyPlus_Support] calculating DryBulb Temp

 

Hi all

anyone can help me to calculate DryBulb Temperature from following notation and units?

precip-htotal ( mm/hour)

temp-hmean  (degC)

vapourpressure-hmean  (hpa)

relhum-hmean  ( %)

sunshine-htotal (hours)

Thanks

Haniyeh

 

 

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