Forum discussion
NC-2009 EAp2: Minimum Energy Performance
If I model a hydronic HVAC plant shall I consider in the proposed model the heat losses through the pipes? And in the baseline model?
Is modeling the pipes as adiabatic in both models incorrect?
And how shall I consider air ducts?
I read that there are mandatory provisions concerning these issues (par. 6.4 of ASHRAE 90.1-2007).
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Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
February 6, 2014 - 6:06 am
Heat losses through the pipe network is specifically EXCLUDED in the modelling protocal of ASHRAE 90.1-2007 Appx. G (excluded from both baseline and designcase models).
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
February 10, 2014 - 9:38 am
Ducts leakage and insulation are not covered by Appendix G. So we typically use the software defaults and model these issues identically in both models.
You are still required to meet the mandatory provisions in your design related to these issues.