For an office space I submitted psychrometrics for the worst day of the year & posted the values on the operative temp graph (fig.5.2.1.1-1). It shows the space falls w/in the std55 acceptable range. The reviewer liked the information & my design summary but still requests I fill in all of the seasonal operative temps, RH, air speed as requested on the form. I am unclear on the seasonal operative temps. The load was run using the ASHRAE summer/winter design day values. How do I determine operative temps for 4 different seasons?
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Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
962 thumbs up
January 3, 2011 - 10:21 am
The Credit Form asks for operative temperatures for both cooling and heating, for each season. For a mechanically conditioned building, your operative temperatures will be the same as the cooling and heating setpoints unless you are doing something unusual. So use the same temperatures across all four seasons.
susan eguia
LEED Coordinator/Construction Administrator/Business DevelopmentBuilding Solutions Group, Inc.
59 thumbs up
January 7, 2011 - 5:06 pm
hi Mike,
Would you mind to share the template of psychometrics that you've submitted. I cannot finalize my IEQc7.1 template. Appreciate your support - susan
I tried to sent email to ANSI/ASHRAE on how can i do the samples they've provided under "Normative Appendix D – Computer Program for Calculation of PMV-PPD”
And here is their respond:
Your inquiry was forwarded to me in the Technical Services department of ASHRAE. The program in Appendix D references an ISO Standard 7730. ASHRAE does not publish a software program with the ability to generate these graphs or run the code. ASHRAE is developing an update to the ASHRAE Thermal Comfort CD that will allow use of the PMV-PPD method but it will not be available in the immediate future.
I apologize I cannot be more helpful.
Sincerely,
Steve Hammerling
Technical Services Engineer
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
962 thumbs up
January 10, 2011 - 5:25 pm
Not sure anyone can post a psych chart.
I typically provide a psych chart that shows coil selections at full, and part load conditions. The purpose is to illustrate that adequate dehumidification will occur.