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41 Introduction The purpose of this chapter is to outline the criteria used in the HVAC system and equipment selection process, to describe some of the systems and equipment available, and to develop some of the underlying philosophy and background related to system selection Details of speci c systems and items of equipment are discussed in later chapters 42 Criteria for System and Equipment Selection The problem-solving process requires some criteria that can be applied in describing and evaluating alternatives In the selection of HVAC systems, the following criteria (Table 41) are used consciously or unconsciously because only rarely is the problem-solving process formally applied 1 Requirements of comfort or process These requirements include temperature, always; humidity, ventilation, and pressurization, sometimes; and zoning for better control, if needed In theory at least, the comfort requirement should have a high priority In practice, this criterion is sometimes subordinated to rst cost or to the desires of someone in authority This is happening less often as building occupants become more sophisticated in their expectations Process requirements are more dif cult and require a thorough inquiry by the HVAC designer into the process and its needs Until the process is fully under81
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 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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Criteria for HVAC System and Equipment Selection 1 2 3 4 5 6 7 8 Demands of comfort or process Energy conservation, code requirements First cost versus life-cycle cost Desires of owner, architect, and / or design office Space limitations Maintainability / reliability Central plant versus distributed systems Simplicity and controllability
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stood, the designer cannot provide an adequate HVAC system Most often, different parts of the process have different temperature, humidity, pressure, and cleanliness requirements; the most extreme of these can penalize the entire HVAC system 2 Energy conservation This is usually a code requirement and not optional State and local building codes almost invariably include requirements constraining the use of new, nonrenewable energy Nonrenewable refers primarily to fossil-fuel sources Renewable sources include solar power, wind, water, geothermal, waste processing, heat reclaim, and the like The strictest codes prohibit any form of reheat (except from reclaimed or renewable sources) unless humidity control is essential This restriction eliminates such popular systems as terminal reheat, two-deck multizone, multizone, and constant volume dual-duct systems, although the two-fan dual-duct system is still possible and the three-duct multizone system is acceptable (see Chap 11) Most HVAC systems for process environments have opportunities for heat reclaim and other ingenious ways of conserving energy Off-peak thermal storage systems are becoming popular for energy cost savings, although these systems may actually consume more energy than conventional systems1 Thermal storage is a variation on the age-old practice of cutting and storing ice from the lake in winter, for later use in the summer 3 First cost and life-cycle cost The rst cost re ects only the initial price, installed and ready to operate The rst cost ignores such factors as expected life, ease of maintenance, and even, to some extent, ef ciency, although most energy codes require some minimum ef ciency rating The life-cycle cost includes all cost factors ( rst cost, operation, maintenance, replacement, and estimated energy use) and can be used to evaluate the total cost of the system over a period of years A common method of comparing the life-cycle costs of two or more systems is to convert all costs to present-worth values Typically, rst cost governs in buildings being built for speculation or short-term investment Life-cycle costs are most often used by institutional
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 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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