Forum discussion
CS-2009 EAp2: Minimum Energy Performance
Hi everyone,
I'm modeling an office building under LEED CS v2009. The scope of C&S includes a centralized cooling and heating system (air cooled chilers and heat pumps), ventilation equiment (DOAS) and 4 pipes to tenant spaces (fan-coils are out of the scope).
Since there are no efficiency requirements for fan-coils within Tenants Lease Agreemet, how should fan-coils be modeled:
1) Specific fan power
2) Part-load control (on/off, 3 speeds, EC motor)?
Thak you all in advance!
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
June 22, 2018 - 10:50 am
The fans should be modeled identical to the baseline system fans. What is the baseline system?
Luis Andrade
3 thumbs up
June 22, 2018 - 11:02 am
The baseline system type for theese spaces is system type 8 - VAV with PFP boxes.
Do you mean that the proposed design fan-coils should be modeled with a 0,74 W/(l/s) for heating and cooling?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
June 22, 2018 - 11:19 am
No you don't use the allowance for the System 8 PFP boxes.
You have three options that should be acceptable to the reviewer. In all cases the systems would be auto-sized in both models. Provide a thorough narrative describing your approach including manufacturer data is following option 2.
1. Fan coils with the Appendix G fan power allowance for a constant volume system.
2. You could determine a worst case scenario by evaluating the worst case fan power of fan-coils that would likely be used in the space.
3. Model a System 7 configuration in the tenant spaces with your central plant.
Moses Chong
Mechanical EngineerWSP
1 thumbs up
October 24, 2018 - 2:27 pm
I'm working on a similar project with central hot/chilled water plants and DOAS with no tenant HVAC system. I understand that the unfinished area should be modeled with autosized fan coil units with Baseline fan power allowance, but what about the fan control? Our DOAS will provide ventilation during occupied hours, does it mean that the proposed fan coils can cycle on/off?
Thanks!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
October 24, 2018 - 3:02 pm
I think you could do that. Be sure to provide a narrative to the reviewer explaining what you are doing and why.