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NC-2009 EAp2:Minimum Energy Performance

MODELLING PUMP IN PROPOSED CASE.

I am Currently working in a project aiming for certification under group certification. I am using DES V2 guideline and opting option 1. while modelling the proposed parameters, i am facing the following issues. Any response for these quires will be very help full. 1. As per option 1 - I need to model Downstream equipments only which means, that i can model only secondary pump with 11 W/GPM (CHW pumps). There is no need to model chillers, primary pumps and cooling towers as it is not required to model the upstream equipments. Is my interpretation is correct? 2. the whole site is using 2 secondary chilled water pumps serving 4 buildings in the site. Is there any methodology to model the proposed secondary chilled water pump?. these 4 buildings are of various size and height and the pump power should be modelled as per the actual requirement.is there any method or options available to model(segregate the pump power or heat of these 2 pump for these 4 buildings) these pumps? 3. Is ASHRAE specifies any methodology to model or calcualte the pump powder under these circumstances? Appriciate prompt reply. Vel

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 01/28/2016 - 15:43

1. That sounds correct assuming there are pumps inside the building. 2. If you have pumps inside the building dedicated to that building alone then they are downstream. Anything outside the building, serving other buildings is upstream. 3. Proportionally but it sounds like you should not be modeling these pumps.

Thu, 01/28/2016 - 19:01

Thanks Marcus, Again, based on your response for my questions, please confirm my understanding on modeling pumps for this project. The Project consists of 4 building out of which 2 buildings are aiming for Certification following Group certification process. there is a chiller plant in the utility building which houses all the chillers and associated pumps. this Utility building is not going for any certification. So, I am going with DES procedure opting option - 1 Stand alone scenario(Cost Neutral with modeling only Downstream equipments). since all these 4 Buildings served by that Chiller plant in the Utility building, none of the pumps are there inside those two buildings which are aiming for certification. So, In this case please let me know whether my modeling methodology is correct or not. 1. As there are no pumps in those two buildings aiming for certification, there is no need to model the pumps in proposed case. Am I Correct? 2. Is it possible to model a chilled water loop without a pump in energy analysis. we can delete the chiller and put a BTU meter but without chilled water pumps we cannot model the HVAC part. 3. If i am not modeling the pumps in the proposed case, my energy consumption of the pumps in the proposed case will be zero. am I correct? 4. If there is no pumps in the proposed design, what about the pumps in the base line? No need to model pumps in baseline (or) i need to model(what will be the W/Gpm) 5. If there is no Pumps in the proposed design, what should i enter in Table 1.4 for pumps? Can i write, 'Pumps are part of the Upstream so not applicable'? Thanks for your time. Appriciate prompt reply. Vel
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 01/28/2016 - 19:37

1. Correct and no pumps in the baseline either. You are treating the chilled water as purchased energy. 2. It should be possible. Again treating the chilled water as purchased energy. 3. Yes 4. No pumps. 5. Nothing.

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