how to generate barcode in asp net c# Condensate, Boiler Feed, and Deaerator Systems 514 Pumps for HVAC Hot Water Systems in Software

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Condensate, Boiler Feed, and Deaerator Systems 514 Pumps for HVAC Hot Water Systems
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long distances are required for the transmission of steam Today, medium- and high-temperature hot water systems have replaced high-pressure steam on many large systems with long piping runs to remote buildings
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2221 Rating of heating systems
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Steam heating systems are rated in (1) MBH (thousands of BTU per hour) like hot water systems, (2) in pounds of steam per hour from feedwater at 212 F to steam at 212 F, or (3) in square feet of radiation A square foot of steam radiation is equal to 240 Btu/h Since a pound of steam at 212 F has a heat of evaporation of 9703 Btu, it has an approximate equivalent of 4 ft2 of steam radiation When steam was the principal heating medium, cast iron and other radiators were rated in square feet of radiation; today, most steam heating coils are rated in MBH like other heating coils 223 Low-Pressure Steam Systems Low-pressure steam systems can range in pressure from vacuum systems up to 15 psig Before the advent of hot water heating systems, many buildings were heated with vacuum-type steam systems Older tall buildings still are heated successfully and very efficiently by vacuum steam systems These vacuum systems allow a broad range of operation, and some of them vary the steam temperature with the load on the system A review of the steam tables will reveal lower steam temperatures for pressures less than atmospheric or under vacuum conditions Vacuum systems were developed to reduce the operating temperature of the steam For example, steam at a vacuum of 15 inHg has a temperature of near 178 F This enabled the radiators and heating coils to operate at temperatures lower than 212 F and provided better control of the heating system With the development of heating coils other than direct radiation, low-pressure steam systems were used in place of the vacuum systems The pressure on these systems is normally in the range of 5 to 12 psig These systems can provide low-pressure steam to other services such as domestic water heaters and converters Converter is the name given to heat exchangers for converting steam to hot water for space heating systems that use coils, radiation, and convectors Steam traps are used to trap the steam in a heating coil but let the condensate through to return to the boilers or condensate pumps Most steam traps used on low-pressure steam systems are thermostatic on small steam-heated equipment or float and thermostatic on
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Condensate, Boiler Feed, and Deaerator Systems Condensate, Boiler Feeds, and Deaerator Systems 515
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larger equipment These traps pass air as well as condensate through the use of thermostatic elements that expand and close when highertemperature steam reaches the elements
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2231 Configuration of low-pressure steam systems
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The shape of the building in which the steam system is installed determines the equipment used in that system The rate of return of the condensate determines the type of steam system that should be used If the condensate can be returned rapidly to the boilers, lowpressure steam can be used without condensate or boiler feed pumps One disadvantage of such direct return is the feeding of makeup water directly into the boiler This may result in the injection of air, and therefore, oxygen directly into the boiler Tall buildings with boilers installed in the basement are candidates for such a system The condensate passes through the steam traps and drops back into the boilers As the steam system becomes broader in shape, the ability of the condensate to return rapidly to the boilers is reduced This necessitates the use of condensate pumps to receive the condensate from the steam traps and return it to the boilers If the steam system is extensive and the delay of the condensate return to the boilers is appreciable, a boiler feed system may be needed to provide storage space for the condensate as it is returned by the condensate systems This prevents the undesirable condition of freshwater makeup entering the boiler because of the delay in the condensate returning to the boiler 224 High-Pressure Steam Systems High-pressure steam systems are used for (1) transporting steam over distances, (2) providing higher temperatures for heating equipment, and (3) high-pressure steam turbines High-pressure steam is used in buildings such as hospitals that can be extensive in layout and require high temperatures for such services as sterilization Most high-pressure steam systems in the HVAC field operate with steam pressures from 40 to 110 psig Many cast iron pipe fittings and valves are rated for 125- or 250-psig steam, so the steam operating pressure is kept below 125 psig Steam at 110 psig or near 125 psia pressure has an evaporation temperature of 344 F, which provides adequate thermal difference for many heating services If steam is required for turbines that are driving chillers or other mechanical equipment, the steam may be generated at higher pressures or temperatures In rare cases in HVAC systems, the steam may be superheated, which means that the steam is heated to a higher
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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