CITY POINT DEVELOPMENT, BROOKLYN, NY

This mixed-use development is comprised of 500,000 square-feet of retail, approximately 280 hotel rooms and 800 residential units, in addition to 250,000 square-feet of office space. Dagher Engineering provided MEP engineering design services and developed strategies to achieve peak load reduction to moderate the energy consumption and reduce the impact on the electrical power grid. In addition, a LEED Silver rating goal has been projected for the development.

Some of the proposed strategies for peak load reduction included cogeneration with ice storage, enhanced commissioning, and energy efficient HVAC systems. The use of a Combined Heat and Power (CHP) system is anticipated to reduce peak loads by 325KW. The on-site cogeneration will be provided by five 65 kW rooftop micro-turbines, which will provide 325 kW at 480V to the residential portion of the building above the 50th floor. In the case of a power outage, these micro-turbines will power one elevator in each bank to maintain building access. At full capacity, 325 KW can be removed from the peak building load through this method, in addition to generating other savings elsewhere in the development’s power grid.

Building hot water will be generated entirely from micro-turbine waste heat. Recovered heat will be stored in twelve 2,000 gallon tanks split between low, mid, and high zones. Three gas-fired water heaters will be located on the top floor as backup for the micro-turbine system.