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NC-2009 EAp2:Minimum Energy Performance

Cooling cost for ground water cooling

Hallo Marcus, I am doing a WBS for an office building, which cooling is supplied by ground water. The only energy consumption of ground water cooling is the energy need for the water pumps. The energy demand for the pumps of cooling circuit are calculated equal to the baseline system, with an efficiency of 349 kW/m³/s. Are the primary and secondary pumps included in this efficiency?

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

Mon, 11/04/2013 - 15:02

The pumps and the overall systems in the Proposed must be modeled as designed. The Baseline pumps are according to Appendix G. The pump efficiency is according to Table 10.8. Efficiency is expressed as a percentage. What you are describing sounds like the power per flow rate. The power and flow rate are modeled in the Proposed as designed. In the Baseline the flow rate is auto-sized by the modeling software based on the loop temperatures. Based on the flow rate the required power is then modeled.

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