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II. Brownway Residence, Nursing Home, Vermont, USA Primary Contacts: Mr. Dennis Moraski, Superior Gas Plants (425) 603-1075 and Mr. John Pifer, Capstone (802) 879-7724 One 30 kW Capstone microturbine has been installed in a large nursing home for combined heat and power generation. The microturbine supplies some of the power for the facility and the hot exhaust heats water for domestic uses and building heating. Boilers provide supplemental heat when needed. This site was commissioned in November 2001. The microturbine replaced an older Mohawk system powered by a General Motors engine (also operating on LP Gas). LP Gas is supplied by Ultramar and stored in three (3) 1,000-gallon underground tanks. The microturbine operates well when there is sufficient gas pressure at the Capstone fuel system inlet (52 psig). Problems encountered to date: In very cold weather the site experienced LP Gas pressures as low as 40 psig. The microturbine fails under such conditions. Capstone and Superior Gas Plants engineers are investigating various methods to raise gas pressure. An effective heating system must be installed by winter 2002 or the site is in jeopardy. Traditional vaporiser/pump systems are not possible because the gas tanks are underground. Most liquid pumps require positive head above the liquid inlet3. Thus, there would be no easy way to pump liquid LP Gas from the tank to an above ground vaporiser. To remedy the situation, Capstone has proposed the Flow Stabilizer system manufactured by Exclusive Thermodynamic Applications Ltd. (ExTA).4 This system is designed to raise the liquid fuel temperature a few degrees to provide enough gas pressure to properly operate the microturbine. There are several such installations in Israel and Turkey. If and when the unit is installed at the Brownway Residence, it will be the first installation in the United States and the first installation for a microturbine application. 3 Water pressure above the pump inlet that pushes down. 4 In the United States, the Flow Stabilizer system is distributed by Superior Gas Plants. The Flow Stabilizer was developed in Israel. 16PDF Image | Glotec Global Technology Network LP Gas Use in Microturbine Applications
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