Economizer
From Wikipedia, the free encyclopedia
An Economizer is a heat exchange device that heats a fluid up to (but not beyond) the boiling point of that fluid.
Economizers are commonly used as part of a HRSG in a combined cycle power plant. In a HRSG, water passes through an economizer, then a boiler and then a superheater. The economizer also prevents flooding of the boiler with liquid water that is too cold to be boiled given the flow rates and design of the boiler
Economizers can save energy in buildings by using cool outside air as a means of cooling the indoor space. When the enthalpy of the outside air is less than the enthalpy of the recirculating air, conditioning the outside air is more energy efficient than conditioning recirculating air.
Economizers can reduce HVAC energy costs in cold and temperate climates while potentially improving indoor air quality, but are not appropriate in hot and humid climates. For information on how economizers and other controls can affect energy efficiency and indoor air quality in buildings, see the U.S. Environmental Protection Agency report, "Energy Cost and IAQ Performance of Ventilation Systems and Controls" [1]
Economizers are so named because they can make use of the enthalpy in fluid streams that are hot but not hot enough to be used in a boiler, thereby recovering more useful enthalpy and improving the efficiency of the steam cycle.
Examples of economizers in chillers would be Flasc Economizers, Flash Economizers, and Flash Flasc Economizers.
[edit] See also
 |
This science article is a stub. You can help Wikipedia by expanding it. |
