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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 /> 69 <br />Outside Air Temperature (OAT) – A measure of the air temperature outside a building. The temperature and <br />humidity of air inside and outside the building are used in enthalpy calculations to determine when outside air <br />can be used for free heating or cooling. <br />Passive solar heating – A solar heating system that uses no external mechanical power, such as pumps or <br />blowers, to move the collected solar heat. <br />Peak load/ Peak demand– The maximum load during a specified period of time <br />Photovoltaic and solar thermal energy – Energy radiated by the sun as electromagnetic waves (electromagnetic <br />radiation) that is converted at electric utilities into electricity by means of solar (photovoltaic) cells or <br />concentrating (focusing) collectors. <br />PSI – An abbreviation for pounds per square inch. PSI is a unit of pressure measurement. <br />Rice Creek Commons (RCC) – The name of the land development project that is being led by Ramsey County, as <br />the land owner, on the site formerly known as the Twin Cities Army Ammunitions Plant (TCAAP). <br />Recommissioning - A type of commissioning that occurs within an existing, operating building to identify ways <br />the building operation is sub-optimal. The decision to recommission may be triggered by a change in building use <br />or ownership, the onset of operational problems, or some other need. Renewable energy resources – Energy <br />resources that are naturally replenishing but flow-limited. They are virtually inexhaustible in duration but limited <br />in the amount of energy that is available per unit of time. Renewable energy resources include biomass, hydro, <br />geothermal, solar, wind, ocean thermal, wave action, and tidal action <br />Resiliency – The ability to withstand disruptions to the regional or national energy grids or significant volatility to <br />the market price for energy sources. <br />Return on Investment (ROI) – The earning power of assets measured as the ratio of the net income (profit less <br />depreciation) to the average capital employed (or equity capital) in a company or project. Expressed usually as a <br />percentage, return on investment is a measure of profitability that indicates whether or not a company is using <br />its resources in an efficient manner. For example, if the long-term return on investment of a company is lower <br />than its cost-of-capital, then the company will be better off by liquidating its assets and depositing the proceeds <br />in a bank. <br />Seasonal energy efficiency ratio (SEER) – Ratio of the cooling output divided by the power consumption. It is the <br />Btu of cooling output during its normal annual usage divided by the total electric energy input in watt hours <br />during the same period. This is a measure of the cooling performance for rating central air conditioners and <br />central heat pumps. <br />Service line/service piping/customer connection – The segment of the district heating distribution system that <br />extends from the main lines to the inside of the customer building. The service line is typically sized to meet the <br />peak hot water flow requirements for the individual building served by the piping. <br />Square Foot (SQ FT or ft2) – Unit of measure to quantify the footprint area of a customer building, used to <br />estimate the Load of a building based on the usage of the building.
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