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TekWorx Optimization Control Makes the Most of Condensing Boiler Plant Design of NYC High-Rise
School District Boiler Retrofit
Boiler Plant Efficiency Improvement for Housing Complex
Award-Winning New Laboratory Project
Piping Freeze Protection for Cooling Tower
A TekWorx Control & Energy Optimization (CEO) System does the thinking for the unique heating and domestic hot water system designed for a building completed in 2005.
Click here to read more.
For this performance contract retrofit project, GA Fleet helped a Long Island, NY school district update 11 schools with 41 AERCO boilers.
AERCO boilers provide heat during 95% of the heating season. Peak load is augmented with cast-iron dual-fuel boilers. An energy management system controls boiler firing rate for maximum system efficiency. Hot water temperatures are reset from 180 to 100 degrees for maximum efficiency; hot water pumps operate on VFDs to vary flow in response to changes in building load. AERCO boilers operate properly without primary pumps, isolation valves, or other flow.
Project Update: 2006
Since the original contract work was completed in 1997, the school district has built a 200,000 sq ft middle school and a 350,000 sq ft high school. In both of these schools the newer, larger AERCO BMK-2.0 boilers were specified by the school district, and are used year round for both heat and domestic hot water.
Beyond the high efficiency provided by the AERCO boilers, the school district takes advantage of an Interruptible Gas rate, further reducing their fuel costs. In this case the alternate fuel is Propane-Air, an all-gas alternate fuel solution that allows the use of high efficiency gas-fired equipment, rather than lower efficiency oil-fired equipment. The propane air system consists of a buried propane tank, with a vaporizer mixer (shown) and fully automatic controls and safety features.
The propane air system was supplied by GA Fleet and is fully integrated into the district's EMS system.
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Boiler room shown before and after. |
This 50-acre Queens, NY housing complex called for the retrofit of 11 circa 1950 #6 oil-fired firetube boiler rooms with 60 high-efficiency gas fired boilers. Each boiler plant provides heat and domestic hot water to several garden apartment buildings. An energy cost study completed by the consulting engineer indicated a 250% improvement in overall boiler plant efficiency.
This project in a newly constructed laboratory building uses a 2,000,000 BTUH boiler plant to provide low temperature heating water. Boiler controls communicate with Johnson Controls BMS to vary HW reset temperatures from 130 to 80 degrees for maximum efficiency. This project won the Governors Award for design.
This downtown NYC financial district building requires year-round cooling tower operation. A sophisticated powerline-based monitor and control system was selected by the consulting engineer to be the most cost-effective method to protect the piping from freezing and to monitor the pipe temperatures. Forty-five remote temperature transmitters are located at every pipe location that could contain standing (non-circulating) water, based on valve positions or pump operation. All monitoring is performed without any wiring, other than power to the heater cables.
The most rugged, flexible, cut-to-length heater cables were selected for this industrial facility truck ramp. The ability to withstand vibration from commercial trucks, salt and other corrosive chemicals, and thermal expansion of the ramp assures heater cable life that will exceed that of the concrete ramp.
This Buddhist temple utilized over 11,000 feet of floorwarming cable to maintain carpet surface temperatures of 80 degrees for the comfort of its members. Finite element heat transfer models were generated by Raychem to design the floorwarming system with as little heater cable as possible. First floor heater cables were imbedded in the floor slab, second floor heater cables were located on the underside of the second floor slab.
