I'm modeling a project oustide the US with Carrier HAP. This place is not in the weather data base of HAP, or DOE's web page, and even though it was, HAP does not allow IWEC files, so I'm kind of stuck.
According to Ashrae 90.1 2007 appendix G2 Simulation General Requirements under G2.3 it states that when weather data is not available, designer should select the one that best represents the climate at the construction site, but also states that it shall be approved by the rating authority, wich in this case will be the reviewer.
So my question is, is anybody having or have had this same problem before, how the reviewers behave on this cases. It's been difficult for me finding similar weather data in other places. I have one for example at the same latitud but much colder on winter. Does it really matters?, since at the end you are comparing both as designed and baseline with the same weather data. I guess could have an implication on the unmet hours.
Best,
Xavi
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
March 11, 2011 - 9:31 am
It does matter.
You should match the heating and cooling degree days as closely as possbile. Reference Table B4. Latitude or elevation do not matter too much. Provide a narrative explanation for why you had to use what you end up using.
javier bolanos zeledon
243 thumbs up
March 11, 2011 - 7:03 pm
Many thx.
I found in Ashrae Fundamentals that Hawaii has almos the same HDD and CDD but based on 65F. I have no data for CDD50F. Do you think that might be a problem, since heating is based on HDD65 but cooling is on CDD50?
Are reviewers flexible on this weather data issues, if you demonstrate it with a narrative??
Best.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
March 12, 2011 - 1:06 pm
They should be flexible depending upon the circumstances.
CDD65 and CDD50 should not be a big difference but I would recommend you find our what the difference is as part of your narrative explanation.
You should be able to find the data with a little looking around.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
March 12, 2011 - 1:17 pm
Here is a good source for weather data.
http://apps1.eere.energy.gov/buildings/energyplus/weatherdata_sources.cfm
javier bolanos zeledon
243 thumbs up
March 12, 2011 - 6:09 pm
Thanks a lot. Yes I have checked and rechecked on that source without luck, but I will continue looking for it. Thanks again.
Best,
Xavi