Re: [EnergyPlus_Support] weather file time stamp

[Drury.Crawley@xxxxxxxxxx]

Most national weather services record observed
temperature on the hour (or generally within a few
minutes)--so it's a snapshot not an average of the
temperature for the hour.  Although as Linda mentions,
we do take the data as being for the entire hour,
00:01 AM to 01:00 AM.

This is true for all the weather files that are available
on the EnergyPlus web site.

Dru



                                                                                                                   
                    "Linda Lawrie"                                                                                 
                    <linda@lawrie.       To:     EnergyPlus_Support@xxxxxxxxxxxxxxx                                
                    com>                 cc:                                                                       
                                         Subject:     Re: [EnergyPlus_Support] weather file time stamp             
                    07/01/2002                                                                                     
                    09:22 AM                                                                                       
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                    EnergyPlus_Sup                                                                                 
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At 08:22 PM 6/30/02, you wrote:
>Hi,
>
>In an EnergyPlus weather file, what does the 'hour1'
>represent? would it be the reading at 12:00 AM or 1:00
>AM? Is it instantaneous or average for past 1 hour?

We take it to be the temperature for the time period 00:01 to 1:00 AM

If the simulation is using more than 1 time steps in hour, then the
temperature used at the time step is a weighted interpolation of the
temperature of the current hour with the temperature at the next
hour.  That is for time=00:15, you will have a 3/4 weight to the
temperature for (00:01 to 1:00AM) and 1/4 weight for the temperature (1:01
to 2:00 AM).  Assuming timesteps in hour=4.

Linda


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