[BLDG-SIM] Problems with IWEC weather files packed for DOE-2 (was Problem with Melbourne weather file)

[Joe Huang]

Problem with Melbourne weather fileAfter looking into Laurier's problem with the DOE-2 packed version of the IWEC weather file for Melbourne, I've determined the problem arises due to: (1) IWEC using the 9999 flag for missing pressures, and (2) the TMY2DCD routine in the DOE-2 weather packer (doewth) not checking for missing value flags and thus reading the 9999 flag literally as 9999 milibars. 

I then checked into all 225 DOE-2 packed IWEC files (*.bin), and found that 49 of them have occurences of the same problems, ranging from one such hour to extreme cases where presssure is missing (and thus interpreted on the *.bin files as 9999 millibars) for all 8760 hours. Assuming that others who have "packed" IWEC for DOE-2 used the same method as I, i.e., modifying the IWEC files to TMY2 format and then packing them as TMY2 files, be warned that many of these files will have bogus pressures. 

I am in the process of modifying doewth to take care of this glitch, either by interpolating between the closest available pressure recordings, or simply using a default pressure based on the station elevation, but wanted to warn people as soon as possible.  I will update BLDG-SIM when this patch is completed.

Joe
----- Original Message ----- 
  From: Laurier Nichols 
  To: BLDG-SIM at gard.com 
  Sent: Monday, February 20, 2006 4:45 AM
  Subject: [BLDG-SIM] Problem with Melbourne weather file


  The IWEC file for Melbourne (Australia) has a major problem with the atmospheric pressure in June and July. 

  The file is idenified as 948660.IWC 

  The pressure is not according to the standardized IWEC fromat. The value is 9999 instead of hundreds of Pascal 

  The file I have is from the disk of IWEC files from ASHRAE. This disk was purchase 3 to 4 years ago. 

  It took several hours to find the cause of erronous results from DOE-2 simulations. 

  Please let me know if this problem was solved for the available files from Energyplus. 

  Let me know also if anybody found other problems with any of the IWEC weather files. 

  Laurier Nichols 
  Dessau-Soprin 
  Montreal, Quebec Canada 
  laurier.nichols at dessausoprin.com 




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