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CS-v4 EAp2:Minimum energy performance

Modeling baseline with System 2 of proposed hotel building with system 8

Hi, 

I'm modeling a 12-floor hotel building located in Dubai that uses System 8: VAV with parallel fan-powered boxes. The proposed system has 8 AHUs and 2 chillers. Since a hotel is considered a residential building under ASHRAE Appendix G, I have to model the baseline with System 2: PTHP (the building only uses electricity). The energy consumption of the baseline is resulting way lower than the energy of the proposed building (therefore 0 energy savings) since the baseline uses less energy for fans, no energy for pumps, and no energy for heat rejection. Is there any exception on how to model the baseline in this case?

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Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Sat, 10/12/2019 - 02:11

No there is not an exception. The results don't sound right. I would expect to see some cooling savings based on the equipment efficiencies alone.
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Maria Grimm
Associate
Meyers+ Engineers
LEEDuser Basic Member
5 thumbs up

Mon, 10/14/2019 - 18:33

Hi Natalia -  One thing to check: make sure your Baseline Case system fans are constant volume, running 24/7. I would expect your Proposed design would have variable volume, therefore you should definitely see some fan savings. 

Mon, 10/14/2019 - 18:50

Thank you Maria and Marcus !

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