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ABSORPTION |
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The process by which one substance is taken into and included within another substance, as the absorption of water by soil or nutrients by plants.
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CHP |
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Cooling, heating, and power.
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DEMAND CHARGE |
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Charges for the use of electricity based on the maximum power requirement, electrical demand, during a specified period of time, typically a month ($/kW).
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DESICCANT |
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A solid or liquid material with an affinity for absorbing water molecules.
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DG |
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Distributed generation: generating power on-site or near-site.
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ENGINE-GENERATOR |
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Electrical generator using a reciprocating, Sterling, or rotary engine.
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ENTHALPY WHEEL |
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Heat exchanger rotating through building supply and exhaust air flows to transfer energy from one air stream to the other.
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EVAPORATIVE COOLING |
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Lowering the temperature of air through the evaporation from a water or wetted membrane; direct evaporative cooling adds water to the supply air while indirect evaporative cooling adds water to the exhaust air and incorporates a heat pipe or thermal wheel for indirect cooling of the supply air.
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FUEL CELL |
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Device for producing electricity using a chemical process rather than conventional combustion processes with electric generators
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HEAT WHEEL |
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Heat exchanger rotating through building supply and exhaust air flows to transfer heat from one air stream to another.
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HVAC |
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Heating, ventilating, and air conditioning.
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IAQ |
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Indoor air quality.
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KW |
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Kilowatt, a unit for measuring electric power. It is equal to 1000 watts.
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LATENT COOLING LOAD |
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Amount of cooling required to reduce humidity of air in conditioned space to specified level for comfort.
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LHV |
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Lower Heating Value. Most of the efficiencies are based on higher heating value (HHV), which includes the heat of condensation of the water vapor in the combustion products. In gas turbine literature the lower heating value (LHV - which does not include the heat of condensation of the water vapor in the combustion products) is often used. The HHV is greater than the LHV by approximately 10% with natural gas as the fuel. LHV efficiencies are about 10 % greater than HHV efficiencies.
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LINE LOSSES |
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Electric energy lost as heat in power transmission lines.
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MICROTURBINE POWER GENERATOR |
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Turbine-engine driven electrical generator with output power under 100 kW.
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MW |
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Megawatt, a unit for measuring electric power. It is equal to 1000 kW.
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POWER RELIABILITY |
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Percent or fraction of the time (hours) power is available in a year (8760 hours).
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REAL TIME PRICING |
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Charges for electrical demand and consumption based on instantaneous cost of production and distribution as opposed to fixed rates or fixed time-of-day rates.
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SENSIBLE COOLING LOAD |
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Amount of cooling required to reduce the temperature of air in the conditioned space to a specified level for comfort.
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THERMAL ENERGY |
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Total amount of heat contained in a substance or required to achieve a task.
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THERMAL WHEEL |
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Heat exchanger rotating between two air flows to transfer heat from one to the other.
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TON OR REFRIGERATION TON |
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Quantity of cooling available from melting 2000 pounds of ice; 12,000 Btu/h or 3.1413 kW.
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VAPOR COMPRESSION AIR CONDITIONING |
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Cooling system based on compression of a gaseous refrigerant to a high pressure, and heat transfer with changes of state (i.e. liquid and vapor) to produce useful heating or cooling.
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W |
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Watt, a unit for measuring electric power.
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WASTE HEAT |
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Portion of the energy input to a mechanical process which is rejected to the environment.
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