Where this credit is sought under commercial interiors, yet the landlord systems do not have all the metering points, would the tenant be expected to provide landlord metering in order to seek this credit.
Does constant and variable motor loads refer to the larger large Lift / elevator motors or does it also mean small fan coil unit fan motors.
Air and water economizers. I believe an air economiser is like a mixing box. What would be an example of a water economizer.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5914 thumbs up
December 9, 2015 - 11:17 am
Someone has to provide the metering infrastructure needed to earn the credit. It does not make any difference who provides it.
Regarding the motor loads - hard to answer this question without any context. This issue does not appear directly related to this credit. In general large and small motors can have a constant or variable load.
Air economizer is typically bringing in outside air do do free cooling when conditions allow. Water side economizer can be several things using extra heat to preheat domestic hot water, bypassing a cooling tower, etc.
Ciaran McCabe
DirectorPassive Dynamics Sustainability Consultants
12 thumbs up
December 9, 2015 - 11:30 am
Thanks Marcus. The LEED CI 2009 manual I have states that constant and variable motor loads should be continuously metered. We could have 40 fan coil units serving a floor over 5 floors. Just wondering if these fans would need to be metered as we would normally not provide this as standard.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5914 thumbs up
December 9, 2015 - 11:52 am
Which Case and option are you pursuing?
Ciaran McCabe
DirectorPassive Dynamics Sustainability Consultants
12 thumbs up
December 9, 2015 - 11:57 am
Case 2 (>75% of the total building area) and we are looking at pursuing Option D calibrated model. Just need to know if all fans need to be metered.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5914 thumbs up
December 9, 2015 - 12:03 pm
OK. While the Reference Guide does refer to continuous metering, the IPMVP does not require it, so there is a conflict. The M&V Plans submitted should be basically the same as those submitted for NC projects. Your M&V Plan should include a thorough description of how you will be gathering the data you need to calibrate the energy model. Often the actual energy use for the fans for this type of unit are derived from data collected by the building automation system. If constant speed fans you can just measure run time and get the fan motor BHP. If variable you will need to measure % and run time to determine energy use. So the fans do not need to me metered directly but the Plan should specify how the energy use of the fans will be determined to enable the calibration of the energy model.