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Solar energy system.A device or structural design feature,a substantial purpose of which is to provide daylight for <br /> interior lighting or provide for the collection,storage and distribution of solar energy for space heating or cooling, <br /> electricity generation or water heating. <br /> (4) Wind energy conversion systems definitions. <br /> Horizontal axis wind turbine.A wind turbine design in which the rotor shaft is parallel to the ground and the blades <br /> are perpendicular to the ground. <br /> Hub.The center of a wind generator rotor,which holds the blades in place and attaches to the shaft. <br /> Hub height.The distance measured from natural grade to the center of the turbine hub. <br /> Monopole tower.A tower constructed of tapered tubes that fit together symmetrically and are stacked one section <br /> on top of another and bolted to a concrete foundation without support cables. <br /> Small wind energy conversion system(SWECS).A WECS of 5,000 kW nameplate generating capacity or less. <br /> Total height.The highest point above natural grade reached by a rotor tip or any other part of a wind turbine. <br /> Vertical axis wind turbine.A type of wind turbine where the main rotor shaft runs vertically. <br /> Wind energy conversion system(WECS).An electrical generating facility that consists of a wind turbine,feeder <br /> line(s),associated controls and may include a tower. <br /> Wind turbine.Any piece of electrical generating equipment that converts the kinetic energy of blowing wind into <br /> electrical energy through the use of airfoils or similar devices to capture the wind. <br /> Itkr <br /> Y— km ' Decrier •! <br /> , Nit _r <br /> um <br /> Ibad 1.604 <br /> kW- <br /> Me <br /> Grirbx !Gerentr <br /> i ` P.aort <br /> Harmmrifu Ms Wrilcsl Asci <br /> Wind Turbine Configurations <br /> (5) Hydronic furnace definitions. <br /> Hydronic furnace.An outdoor wood boiler that provides heating or hot water using a firebox surrounded by a water <br /> jacket enclosed within an insulated shed.A fire is started inside the firebox,and the water temperature is controlled <br /> by a thermostatically actuated damper. <br /> (d) Ground source heat pump systems. <br /> (1) Zoning districts.Ground source heat pump systems in accordance with the standards in this section are allowed as <br /> a permitted accessory use in all zoning districts. <br /> (2) Standards. <br /> a. System requirements. <br /> 1. Only closed loop ground source heat pump systems utilizing heat transfer fluids as defined in section 78- <br /> 1379(3)are permitted.Open loop ground source heat pump systems are not permitted. <br /> 2. Ground source heat pump systems in water bodies owned or managed by the City of Orono are not <br /> permitted. <br /> 3. Ground source heat pump systems in private ponds constructed within uplands and that are not <br />