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Additional resources for ASHRAE 2000 HVAC Systems and Equipment Handbook
Boiler manufactures generally apply a combination of these heat transfer surfaces for boilers. In fire tube boilers the products of combustion flow inside tubes and the transfer medium (water) flows outside. In water tube boilers the products of combustion flow outside tubes and the transfer medium flows inside the tubes. Cast iron sectional boilers transfer the heat from the combustion gases to the water through cast iron sections. More types of construction are described in Chapter 27. Working Pressure Pressures in the boiler also affect its classification.
ECONOMIZERS Air-Side Economizers The air-side economizer takes advantage of cool outdoor air to either assist mechanical cooling or, if the outdoor air is cool enough, provide total cooling. It requires a mixing box designed to allow 100% of the air to be drawn from outside. It can be field-installed accessory that includes an outdoor air damper, relief damper, return air damper, filters, actuator, and linkage. Controls are usually a factory-installed option. Self-contained units usually do not include return air fans.
Centralizing this function keeps the conversion equipment in one location and distributes the heating and cooling in a more readily usable form. Also, a central cooling and heating plant provides higher diversity and generally operates more efficiently with lower maintenance and labor costs than a decentralized plant. However it does require space at a central location and a potentially large distribution system. This chapter addresses the design alternatives that should be considered when centralizing the cooling and heating sources in a facility.