| Term | Definition |
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| Economizer | Utilizes waste heat by transferring heat from flue gases to warm incoming feedwater.
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| EDR | Equivalent direct radiation is the rate of heat transfer from a radiator or convector. It is equivalent to the square feet of surface area necessary to transfer heat at the same rate at which it is produced by a generator. A single boiler horsepower equals 140 ft2 EDR.
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| Efficiency | The ratio of output to input. See also Combustion, Fuel-to-Steam and Thermal Efficiency.
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| Ejector | A device which utilizes the kinetic energy in a jet of water or other fluid to remove a fluid or fluent material from tanks or hoppers.
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| Electric Boiler | A boiler in which electric energy is used as the source of heat.
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| Electrostatic Precipitator | A device for collecting dust, mist or fume from a gas stream, by placing an electrical charge on the particle and removing that particle onto a collecting electrode.
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| Entrainment | The conveying of particles of water or solids from the boiler water by the steam.
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| Equalizer | Connections between parts of a boiler to equalize pressures.
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| Equivalent Evaporation | Evaporation expressed in pounds of water evaporated from a temperature of 212° F to dry saturated steam at 212° F.
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| Evaporation | The change of state from a liquid to a vapor.
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| Evaporation Rate | The number of pounds of water that is evaporated in a unit of time.
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| Excess Air | Air supplied for combustion in excess of that theoretically required for complete oxidation.
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| Expansion Joint | The joint to permit movement due to expansion without undue stress.
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| Explosion Door | A door in a furnace or boiler setting that is designed to be opened by a pre-determined gas pressure.
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| External Treatment | Treatment of boiler feed water prior to its introduction into the boiler.
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