Hi, I have many chilled water pumps, 1 primary and 3 loop secondary pumps with heat exchangers. The issue is the modelling software - HAP (even IES) can model only 1 primary and 1 secondary pump so I'm wondering if averaging capacities and flow rates of 3 secondary pumps is a good way to input the model
2. ME engineers show fans, pumps in schedule under full load running with some safty factor and the real load would be different from the schedule. Will I model as per schedule just to keep consistency among doc or real load?
3. Chiller in proposed case works at different temp set point from the baseline, do I have to transform COP of proposed chiller under standard condition (ASHRAE 90.1)
Thank you very much
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5921 thumbs up
October 7, 2014 - 9:20 am
How to model something within a particular piece of software might be better addressed by the software vendor or in one of the discussion groups found at onebuilding.org (HAP is covered).
1. In general you are required to model the proposed case as designed. If you need to perform a workaround you must describe it thoroughly and cite the source. A published workaround is highly encouraged.
2. You model the fans/pumps as designed/installed and then the software matches it to the load. Model per the schedule.
3. Model the proposed as it is designed. It is OK to have different temp set points compared to the baseline.