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11 Introduction This chapter is devoted to fundamental fundamentals certain principles which lay the foundation for what is to come Starting with the original author s suggested thought process for analyzing typical problems, the reader is then exposed to a buzzword of our time: value engineering Next follows a discussion of codes and regulations, political criteria which constrain potential design solutions to the bounds of public health and welfare, and sometimes to special interest group sponsored legislation The nal sections of the chapter offer a brief review of the basic physics of heating, ventilating, and air conditioning (HVAC) design in discussions of uid mechanics, thermodynamics, heat transfer, and psychrometrics Numerous classroom and design of ce experiences remind us of the value of continuous awareness of the physics of HVAC processes in the conduct of design work 12 Problem Solving
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Every HVAC design involves, as a rst step, a problem-solving process, usually with the objective of determining the most appropriate type of HVAC system for a speci c application It is helpful to think of the problem-solving process as a series of logical steps, each of which must be performed in order to obtain the best results Although there are various ways of de ning the process, the following sequence has been found useful: 1 De ne the objective What is the end result desired For HVAC the objective usually is to provide an HVAC system which will control
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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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the environment within required parameters, at a life-cycle cost compatible with the need Keep in mind that the cost will relate to the needs of the process More precise control of the environment almost always means greater cost 2 De ne the problem The problem, in this illustration, is to select the proper HVAC systems and equipment to meet the objectives The problem must be clearly and completely de ned so that the proposed solutions can be shown to solve the problem 3 De ne alternative solutions Brainstorming is useful here There are always several different ways to solve any problem If remodeling or renovation is involved, one alternative is to do nothing 4 Evaluate the alternatives Each alternative must be evaluated for effectiveness and cost Note that doing nothing always has a cost equal to the opportunity, or energy, or ef ciency lost by not doing something else 5 Select an alternative Many factors enter into the selection process effectiveness, cost, availability, practicality, and others There are intangible factors, too, such as an owner s desire for a particular type of equipment 6 Check Does the selected alternative really solve the problem 7 Implement the selected alternative Design, construct, and operate the system 8 Evaluate Have the problems been solved The objectives met What improvements might be made in the next design Many undertakings fail, or are weak in the end result, due to failing to satisfy one or more of these problem-solving increments There is an art in being able to identify the key issue, or the critical success factors, or the truly bene cial alternative Sometimes the evaluation will be clouded by constraint of time, budget, or prejudice Occasionally there is an error in assumption or calculation that goes unchecked The best defense against disappointment is the presence of good training and good experience in the responsible group 13 Value Engineering
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Value analysis or value engineering (VE) describes a now highly sophisticated analytical process which had its origins in the materiel shortages of World War II In an effort to maintain and increase production of war-related products, engineers at General Electric developed an organized method of identifying the principal function or service to be rendered by a device or system Then they looked at the current solution to see whether it truly met the objective in the simplest and most cost-effective way, or whether there might be an alternative approach that could do the job in a simpler, less costly, or more
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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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