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NC-2009 EAp2:Minimum Energy Performance

Baseline EER - System 2 PTHP

As per Table 6.8.1D, I observed the following EER = 12.3-(0.213*Cap/1000) EER Also, Cap means the rated cooling capacity of the product in Btu/hr. If the unit's capacity is less than 7000 Btu/hr, use 7000 Btu/hr in the calculation. If the unit's capacity is higher than 15000 Btu/hr, use 15000 Btu/hr in the calculation. Questions: What capacity used in the calculation for capacities between 7000 Btu/hr and 15000 Btu/hr. (This is not mentioned) Capacity should be arrived from basecase energy model or proposed havc system's capacity If arrived from basecase means, whether the coooling, heating capacity should be oversized by 15%, 25% respectively or not? What is the meaning of rated cooling capacity of the product? (is this based on proposed model of ac system) Please help.

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Sun, 04/16/2017 - 05:58

could any one help me on the query above? Please
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Fri, 04/21/2017 - 14:41

We have a saying - good, fast, cheap - pick two. I won't compromise good and I do this for free so . . . sorry for the delay. The table serves dual purposes. For the baseline system efficiency determination - Between the minimum and the maximum capacities (7,000 and 15,000) you use the actual capacity derived from the auto-sizing in the baseline model based on the 15%/25% oversizing requirement. This table in the standard is also used to spell out the minimum efficiency required of the proposed equipment. This is a mandatory provision so the proposed equipment must comply. In that case you would use the rated or actual capacity of the equipment.

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