For case 1 (project less than 75% of the total bldg sqft), can temporary metering fulfill the metering requirement? If so, under what circumstances (e.g. minimum monitoring period length, BMS visibility).
Reading through the IPMVP for Option D (Calibrated model), the savings are determined by the base case model and the calibrated model. While there is no magic period length for calibrating a model, 3-months of between two seasons can be provide sufficient data variability. If the IPMVP option is satisfied, will the LEED credit be awarded.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
October 3, 2012 - 9:21 am
Case 1 does not follow the IPMVP. Basically you earn case 1 if you submeter the total energy use of electricity, any fuel and water usage. Temporary meters would not meet the intent of the requirement to provide ongoing accountability.
Matthew Tovar
Energy EngineerOctober 16, 2012 - 6:56 pm
Thank you for you reply. I have a question about fuels. Heating hot water is monitored by a flow meter, and temperature sensors, however, the gas fired domestic hot water heater does not have metering. In the reference guide it states that "Natural gas, which may be used for both space heating and service heating, can be submetered." Must natural gas be submetered if only used for domestic hot water?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
October 17, 2012 - 9:34 am
You need to be able to measure gas fuel use in the tenant space even if it is for DHW only. You do not need to measure gas consumption directly if you can make the case that the natural gas usage in the space can be derived from the metering installed.