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04-13-15-R
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04-13-15-R
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4/13/2015 1:58:39 PM
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TCAAP Energy Integration Resiliency Framework <br />Exhibits <br /> <br /> <br /> 98 <br />Heating Degree Days – A degree day is the difference in temperature between the outdoor mean temperature <br />over a 24-hour day and a given base temperature. Heating degree days occur when the outdoor mean <br />temperature is below 65 F. <br />Heat exchanger – A pressure vessel that contains plates or tubes and allows the transfer of heat through the <br />plates or tubes from the district heating system water to the building heat distribution system. A heat exchanger <br />is divided internally into two separate circuits so that the district heating system water and the building heat <br />distribution system fluids do not mix. <br />Heating coil – A heating element made of pipe or tube that is designed to transfer heat energy to a specific area <br />or working fluid. <br />Hot water supply and return lines – The district heating system piping that distributes hot water for heating <br />purposes to customers (supply) and returns the cooler water to the Plant for reheating (return). <br />Kilowatt (kW) – A unit of power equal to one thousand Watts (W) <br />Kilowatt-hour (kWh) – A measure of electricity defined as a unit of work or energy, measured as 1 kilowatt <br />(1,000watts) of power expended for 1 hour. One kWh is equivalent to 3,412 Btu. <br />Load – The amount of energy used by a customer. Typically refers to the Peak Load on the system. <br />Levelized Cost of Energy (LCOE) – The present value of the total cost of building and operating a generating plant <br />over its economic life, converted to equal annual payments. LCOE is determined by dividing the project’s total <br />cost of operation by the energy generated. <br />Medium temperature hot water – Thermal heat transferred via hot water at a temperature between 190 °F and <br />250 °F. <br />Megawatt (MW) – One million Watts (W) <br />Megawatt-hour (MWh) – One thousand kilowatt-hours <br />Microgrid – A group of interconnected loads and distributed energy resources within clearly defined electrical <br />boundaries that act as a single controllable entity with respect to the grid and can connect and disconnect from <br />the grid to enable it to operate in both grid-connected or island-mode. <br />Million BTU (MMBTU) –One million British Thermal Units (BTU). One MMBTU is equivalent to 293.07 kWh. <br />Net Present Value (NPV) – The difference between the present value of the future cash flows from an <br />investment and the amount of investment. Present value of the expected cash flows is computed by discounting <br />them at the required rate of return. A zero net present value means the project repays original investment plus <br />the required rate of return. A positive net present value means a better return, and a negative net present value <br />means a worse return, than the return from zero net present value. <br />Non-diversified load – The sum of the peak loads of individual users. This is a theoretical maximum system peak <br />load.
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