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11-10-14-R
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11-10-14-R
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2/24/2016 3:51:05 PM
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TCAAP Energy Integration Resiliency Framework <br />Policy White Paper – Exhibit I - Definitions <br /> 68 <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 />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. <br />Normalized – Adjusted annual data of monthly building usage values measured on different monthly heating <br />degree scales to a common scale prior to averaging. <br />N+1 Redundancy – A measure of system component redundancy to provide backup in the event of failure of any <br />one component. N+1 refers to the number of units installed to carry normal load plus one additional unit as <br />backup. For example, if a system has three chillers to achieve the total design load, each is rated at 33% of the <br />total load, or N=3. For this example, an N+1 system will have a total of four chillers of 33% capacity for a total <br />installed capacity of 133% with one chiller providing backup in the event of failure of any one chiller. <br />Operations and Maintenance (O&M) – The activities related to the performance of routine, preventive, <br />predictive, scheduled, and unscheduled actions aimed at preventing equipment failure or decline with the goal <br />of increasing efficiency, reliability, and safety.
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