economizer

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economizer

[ē′kän·ə‚miz·ər]
(engineering)
A reservoir in a continuous-flow oxygen system in which oxygen exhaled by the user is collected for recirculation in the system.
(mechanical engineering)
A forced-flow, once-through, convection-heat-transfer tube bank in which feedwater is raised in temperature on its way to the evaporating section of a steam boiler, thus lowering flue gas temperature, improving boiler efficiency, and saving fuel.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Economizer

 

a component of a boiler unit. An economizer is a heat exchanger in which feed water is heated by flue gases before the water is supplied to the boiler. For a pressure of up to 22 kilograms-force per cm2 (2.2 megapascals) and a feed-water temperature below the dew point of the flue gases or for water that has not been deaerated, an economizer consisting of plain cast-iron tubes or of finned cast-iron tubes is used. For higher temperatures and pressures, an economizer consisting of steel tubes is used; most economizers of this type consist of plain steel tubes. An economizer increases the efficiency of a boiler unit.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

economizer

economizer
Economizer/Re-breather.
economizerclick for a larger image
i. A reservoir in a continuous-flow oxygen system in which exhaled oxygen is collected for recirculation in the system. This way the consumption of oxygen is economized.
ii. The system of metering additional fuel in a carburetor or fuel injection system when the throttle is wide open. This additional fuel helps remove some of the heat when the engine is producing maximum power. The system provides an economical fuel-air mixture at all settings except at full power. Also called a power-enrichment system or a fuel economizer system.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
The flash tank cycle required significantly lower fin density for the indoor coil (480 fin/m instead of 709-752 fin/m for the economizer cycle) and slightly lower outdoor coil fin density (285 fin/m versus 289 to 356 fin/m for the economizer cycle) while meeting the design requirement for COP of 3.81 and capacity of 117.6 (60kBtu/hr).
In this optimization study, the compressor capacity multiplier for optimum design was 1.24 for the flash tank cycle and 1.3 for the economizer cycle. The outdoor fan flow rate multiplier varied between 0.65 and 0.9 for the different cycle configurations.
The flash tank cycle had a maximum COP of 2.02; 7% better than the 50% effective economizer cycle. The economizer cycle COP shows some dependence on the economizer effectiveness.
The lowest bin in this model is 30% of building load, because the cooling load associated with lesser loadings occurs only during that time of the year when an airside economizer cycle is available.
In facilities that employ a 100% air-side economizer cycle in mild weather, chillers may be turned off altogether during much of the IPLV's 25% bracket.
Typical energy savings from the refrigerant economizer cycle range from 5% to 7%.
Whilst there may have been a case for trigeneration systems with traditional designs using absorption chillers for the base cooling load, extensive use of free cooling/ economizer cycles means there is no longer a base refrigeration load.
Since supply-air temperatures for underfloor systems may be significantly higher, economizer cycles using outdoor air only for building cooling can be extended, especially in areas with relatively mild temperatures and low-humidity climates.
Fan systems serving tenant floors were originally designed using the air-side economizer cycles and were equipped with elaborate central air filtration systems.
Third, reduce other building loads through economizer cycles, nighttime precooling, window film and shading, and increased exterior insulation.
This book covers many aspects of datacom facility energy efficiency, and includes chapters on the topics of environmental criteria, mechanical equipment and systems, economizer cycles, airflow distribution, HVAC controls and energy management, electrical distribution equipment, datacom equipment efficiency, liquid cooling, total cost of ownership, and emerging technologies.