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11-24-14-R
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11-24-14-R
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TCAAP Energy Integration Resiliency Framework <br />Policy White Paper – Exhibit I - Definitions <br /> 65 <br />Capacity – The maximum output, commonly expressed in megawatts (MW), that generating equipment can <br />supply to system load, adjusted for ambient conditions. <br />Chiller – Any centrally located air conditioning system that produces chilled water in order to cool air. The chilled <br />water or cold air is then distributed throughout the building, using pipes or air ducts or both. These systems are <br />also commonly known as “central chillers," "centrifugal chillers," "reciprocating chillers," or "absorption <br />chillers." Chillers are generally located in or just outside the building they serve. Buildings receiving district <br />chilled water are served by chillers located at central physical plants. <br />Chilled Water – The product of a Chiller that is distributed through a building or, in the case of a District Cooling <br />system, other adjacent buildings for the purposes of air conditioning. <br />Coefficient of Performance (COP) – Ratio of work or useful output to the amount of work or energy input, both <br />represented in the same unit. Used generally as a measure of the energy-efficiency of chillers and heat pumps. <br />Combined Heating and Power (CHP) – A plant designed to produce both heat and electricity from a single heat <br />source. <br />Conservation – A reduction in energy consumption that corresponds with a reduction in service demand. Service <br />demand can include buildings-sector end uses such as lighting, refrigeration, and heating; industrial processes; <br />or vehicle transportation. Unlike energy efficiency, which is typically a technological measure, conservation is <br />better associated with behavior. Examples of conservation include adjusting the thermostat to reduce the <br />output of a heating unit, using occupancy sensors that turn off lights or appliances, and car-pooling. <br />Constant Air Volume (CAV) – A system designed to provide a constant air flow. This term is applied to HVAC <br />systems that have variable supply-air temperature but constant air flow rates. Most residential forced-air <br />systems are small CAV systems with on/off control. <br />Consumer (energy) – Any individually metered dwelling, building, establishment, or location using natural gas, <br />synthetic natural gas, and/or mixtures of natural and supplemental gas for feedstock or as fuel for any purpose <br />other than in oil or gas lease operations; natural gas treating or processing plants; or pipeline, distribution, or <br />storage compressors. <br />Cooling 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. Cooling degree days occur when the outdoor mean <br />temperature is above 65 F. <br />Cubic Feet per Minute (CFM) – A common means of assigning quantitative values to volumes of air or fluid in <br />transit. <br />Customer conversion – The equipment in a customer building mechanical room that transfers thermal energy <br />from the district heating system to the building systems to allow the heat to be distributed throughout the <br />building. The customer conversion usually consists of heat exchangers, pumps, piping, control sensors, and <br />control valves to enable heat to be efficiently transferred from the higher temperature district heating system to <br />the lower temperature building system.
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