Research Project Summary Information
Energy Management System Development:Multifamily Dual System(ST5036-1)
Applied Energy Group, Inc.
Waterside Plaza is a 1,470 unit, electrically heated and air-conditioned, master-metered multifamily housing complex that is under the jurisdiction of the New York City Department of Housing Preservation and Development and the U.S. Department of Housing and Urban Development (HUD). This complex has installed a Dual System that combines energy management and electrical submetering. The energy management portion of the system is currently operational. The submetering portion of the system has also been installed but has not been implemented for billing purposes because of tenant opposition and other institutional barriers including the inability to develop an accurate rent reduction estimate. In order to facilitate submetering in this complex, and in many others like it, data collection and analysis needs to be performed to demonstrate the energy benefits of submetering and to calculate the appropriate rent reduction amounts.
Under the project, Applied Energy Group (AEG), Inc. collected the individual apartment energy usage data each month from the submetering system for 13 months, and obtained copies of the monthly electric consumption data from the utility bills during the monitoring period. Further, the AEG monitored and documented how the energy management system (EMS) operated at the complex to manage the complex's energy usage, and analyzed of the collected monthly energy consumption data with previously collected data from when the EMS was not fully operational to determine the energy and peak demand savings due to the EMS. Finally, the AEG used the collected data to estimate the potential for submetering savings and the actual consumption reduction attributable to submetering, if implemented.
EMSs can reduce energy consumption in buildings by 10-30%. Submetering can reduce energy consumption in master metered buildings by 18-25%.
The energy management portion of the system has provided energy saving of 4% at this complex, saving approximately $169,000 in energy expenses when operated without the submetering portion of the system. The EMS revealed energy usages ranged by factors of 10 to 20 for a given apartment size (e.g., studios, one bedrooms, etc.). Cases were also observed where the energy consumptions of one-bedroom apartments were more than the average energy consumption of a three-bedroom apartment. The management company implemented submetering in November of 2001. It is expected the submetering portion of the system, when operated in parallel with the energy management portion, will achieve energy savings of 15-20%.
A final report was published and distributed to multifamily building managers and policy analysts at New York State Division of Housing and Community Renewal, Housing Preservation and Development (HPD), Public Service Commission, and HUD. The results of these analyses were presented at an American Council for an Energy Efficient Economy conference. A technical article was published in a professional journal (Home Energy magazine).
Applied Energy Group, Inc.
1377 Motor Pkwy Ste 401
Islandia, NY 11749
NYSERDA Contact Information
R&D - Buildings Research