04-13-15-R - Laserfiche WebLink

Home Browse Search

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