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Facilities Management Thermal Storage Project
By Monte Moore The "Thermal Storage Project" (also known as the Ice Plant) is powered by a Combined Heat and Power (CHP) system that supplies electricity to two Trane ice chillers. These units freeze water in 102 large storage tanks to be harvested on demand, (expandable to 162 tanks and 3 ice chillers, as growth requires) providing 15,000-ton hours of capacity or 2000 tons per hour for 7.5 hours. This is accomplished through multiple plate and frame systems using a 25% ethylene glycol mixture. This method is used to freeze and later harvest the ice that is produced in each tank for the purpose of supplementing the chilled water system. This allows peak load to be shifted to off-peak times and further improves plant efficiency. The CHP Turbine may now be loaded at off-peak hours, which in turn reduces the higher G-30 natural gas cost for boiler steam, because the turbine heat recovery system is being utilized. High Emissions will not occur because of under loading of the Turbine. In turn, higher chilled water costs are kept to a minimum by reducing the number of chillers running at peak times. This system should be online on or before August 1, 2004. With peak cooling loads approaching 32,000 tons for 10.5 million GSF, (every potential area for savings needs to be examined to lower the quantity of purchased utilities and lower the cost of manufactured utilities). |
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