[BLDG-SIM] Determining extreme hot weather.

[William Bahnfleth <wbahnfleth@xxxxxxx>]

Not a direct answer to you question, but perhaps this will save you some
work.

ASHRAE did a research project several years ago to compile extreme
weather sequences.  I imagine that this would serve your purpose if
the database includes a site that is reasonably close to yours. 
These sequences are as long as 7 days.  I doubt that you would need
a month of data to generate the maximum cooling load.

Design Weather Sequence Viewer CD-ROM

Extreme weather sequences were abstracted from existing long-term data
for over 200 U.S. locations and over 100 Canadian locations to create
this CD. Users are provided a summary of the statistics of these
sequences, and the program will select the output of the desired data. On
an hourly basis, 3, 5 and 7 day sequence lengths are identified for high
and low dry-bulb temperature, high enthalpy, high dew-point temperature
and low wet-bulb depression. The sequences correspond to the 0.4, 1 and 2
percent annual frequency of occurrence (equivalent to the 1, 2.5 and 5
percent seasonal frequency of occurrence). 

PUBLISHER: ASHRAE 
PUBLISH DATE: 1998 
ISBN/ISSN: ISBN 1-883413-64-8 

University of Kentucky/Donald Colliver was the contractor on that
one.  I'd try the high dry bulb and high enthalpy sequences to see
which is worse.

Another possibility is to generate synthetic sequences using another
product of ASHRAE research:

EXTREMES: Weather Sequence Generator CD-ROM

This program synthesizes extreme, but statistically possible, hourly
weather data for periods of up to one week for a specified month and for
over 300 locations in North America, with the capability of modifying or
expanding the data for greater flexibility. Operates under Microsoft
Windows 95/NT operating systems. 

AUTHORS: "D. Schmitt, S.A. Klein, D.T. Reindl" 
PUBLISHER: ASHRAE 
PUBLISH DATE: 1998 
ISBN/ISSN: ISBN 1-883413-64-8 
UNITS: Dual units 

Both available from the ASHRAE bookstore at
www.ashrae.org

Bill Bahnfleth

At 11:49 AM 1/3/2003 -0500, Lopez, Phylroy wrote:
> Hello Group...
>
> I'm in the process of putting together a thermal active cooling
> simulation
> model to be used in residential buildings. I need to run it against
> extreme
> hot weather data. the problem is this.
>
> *-I have weather data spanning 10 years for a given location.
>
> *-I need to determine the hottest month or week that will produce
> the
> largest cooling load.
>
> What criteria should I look for as the load is based not only on dry
> bulb
> temp but also humidity and solar.
>
> Is there any sort of CoolingLoad factor algorithm that takes all of
> these
> into account when sizing cooling systems? Is there a common weighting
> factor
> used?
>
> CoolingLoadFactor(SolarGains, DryBulbTemp, Humidity,... ?) = ?
>
> I''l need a criteria to create a program to parse the weather data
> to get my extreme week/month.
>
> Thanks for your help
>
> Phyl
>
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_________________________________________________

William P. Bahnfleth, Ph.D., P.E.                        

Associate Professor

Director, Indoor Environment Center

                                     

Department of Architectural Engineering

The Pennsylvania State University

104 Engineering Unit A

University Park, PA 16802 USA

voice: 814.863.2076 / fax: 814.863.4789

e-mail:  wbahnfleth@xxxxxxx

www.arche.psu.edu/faculty/WBahnfleth/

_________________________________________________


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