[Bldg-sim] DES Option 1 Pump Power

[Kevin Kyte]

Hello, I am reviewing an energy model and associated LEED comment for a DES project that is modeled using Option 1 (stand-alone scenario), there is no specific reference to pump power within the guidance document.  The LEED comment states:

"Since the project follows the DES guidance Option 1, only the Baseline secondary distribution loop from Appendix G, with the relevant pump and loop parameters from that secondary loop must be modeled. Additionally, since the distribution loop for hot water is a primary-only loop that includes both upstream and downstream equipment, this option is not available for purchased steam or hot water, and the Baseline Case hot water pumps must be modeling identically in the Baseline and Proposed Cases based on the Proposed Case values.

I believe the directive here is to model the baseline pumps identical to the proposed and equal to the proposed values.  The LEED review comment states that the loop includes upstream equipment when Option 1 is specifically to exclude upstream equipment and model stand-alone.  The energy source is purchased heat.

I think the problem is that I see that the steam coils in the roof-top units are modeled in the same loop as the HW terminal units.  If I separate these into two loops I should be able to claim energy savings for the pump power associated with the HW terminal units.  Is this correct or is it still required to model the HW terminal unit pump power identical in baseline and proposed cases?
Thank you.


Kevin J. Kyte, PE BEMP LEED AP
WATTS ARCHITECTURE & ENGINEERING
95 Perry Street | Buffalo, NY 14203
Direct: 716 206 5174
Main Desk: 716 206 5100
Fax: 716 206 5199

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