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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

DHW Equipment Performance; DES Heating

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Samuel Sura
Mr
e-Dome
LEEDuser Basic Member
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Dear all, please help me with these questions: 1) I'm not sure how to specify a water heating equipment performance. In many cases the baseline building has to have an electric resistance heating of DHW. So Table 7.8 provides two options 12kW. I assume this is a DHW system peak load value. For 12kW: 20+35*√V = 1833.12 Btu/h = 0.5371 kW = 0.00105 kWh/l*day. OK but still don't know what is the heating equipment efficiency... Because in any simulation program you are required to define it of course. Should it be 100%? 2) we work on project with DES heating. It's LEED v2009 CS and we have chosen Option 1. From what I read in guidance for DES in LEED I understand that baseline heating source shall be modeled with all system parameters as specified in Apendix G if Table 3 of the guidance is not modifying it. It means that all baseline heating equipment efficiency and resets remains the same as it would be modeled without DES right? (but only for Option1) Thank you very much in advance for any help, mainly with DHW efficiency.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Mon, 04/25/2016 - 16:23

1. Size is the capacity of the elements, not the peak load. It is the volume. If it has no tank then it is an electric instantaneous heater which is not regulated. So it would be modeled identically in the baseline. 2. Under Option 1 you model purchased heat so while there may be no change listed in Table 3 you do not model a boiler and associated equipment in the baseline.

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