TES Spells Savings

The owners of Shell Point, a retirement community near Ft. Myers, Fla., had a problem. It cost them nearly $1.13 million a year to power the 60-plus buildings on their campus. Several new chillers and thermal energy-storage (TES) systems however, are making a very nice dent in the community's energy bill.

08/01/2001


The owners of Shell Point, a retirement community near Ft. Myers, Fla., had a problem. It cost them nearly $1.13 million a year to power the 60-plus buildings on their campus. Several new chillers and thermal energy-storage (TES) systems however, are making a very nice dent in the community's energy bill.

The retrofit involved the installation of two 100-ton chillers and a TES system to provide cooling for the village's church and assembly hall. Although the new system cost an additional $136,000, compared to a traditional cooling system, energy costs at this location have been cut nearly in half.

The TES system stores 972 ton-hours of ice at night during off-peak hours. The stored ice is then used in conjunction with the chillers to air-condition the facilities during the day. As a result, approximately 2.71 cents per kWh have been shifted to off-peak hours, plus an additional $8.30 is saved for each kilowatt of demand that is avoided. Combined with a $50,150 rebate from Florida Power and Light, Shell Point owners are now looking at a payback of less than two years.

Additional benefits of the campus-wide retrofit have also been reported, notably better indoor-air quality and occupant comfort. Prior to the installation of the new equipment, Shell Point's senior apartments suffered from high relative humidity. Because the new TES system supplies lower temperature coolant to the air-handler coils, humidity has been lowered. Mold and mildew problems have also been greatly reduced.

Additionally, the new cooling system has also proved its worth in maintenance, with average annual upkeep costs of $35,000 dropping by almost 90 percent.





No comments
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
Combined heat and power; Assessing replacement of electrical systems; Energy codes and lighting; Salary Survey; Fan efficiency
Commissioning lighting control systems; 2016 Commissioning Giants; Design high-efficiency hot water systems for hospitals; Evaluating condensation and condensate
Solving HVAC challenges; Thermal comfort criteria; Liquid-immersion cooling; Specifying VRF systems; 2016 Product of the Year winners
Driving motor efficiency; Preventing Arc Flash in mission critical facilities; Integrating alternative power and existing electrical systems
Putting COPS into context; Designing medium-voltage electrical systems; Planning and designing resilient, efficient data centers; The nine steps of designing generator fuel systems
Designing generator systems; Using online commissioning tools; Selective coordination best practices
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.
click me