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Summary of HVAC Energy Evaluations Summary of HVAC Energy Evaluations 613
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plant operation The cost of this instrumentation is relatively small for medium and large chiller plants More can be gained from this efficiency than from any other system or equipment efficiency for chilled water operations Not all these equations will be useful for every HVAC water system The size and economics of each application will determine their value Systems with high energy costs will justify their use more than systems with low energy costs It is in the province of the designer to determine which of them will aid in the design and operation of specific HVAC water systems Obviously, the first cost of the instrumentation and electronics will have a bearing on which efficiencies are utilized for a particular installation Generally, it is not feasible to have one overall efficiency for an HVAC water system, since there are several uses of energy in such a system At this date, there does not appear to be any interest in such an efficiency Also, some systems use several sources of energy, which makes difficult the development of an overall efficiency The objective of the designer now should be to determine which of these expressions of efficiency will establish and sustain the operating efficiency of HVAC water systems 304 Sustained System and Equipment Efficiencies Sustaining operating efficiency is as important as the original equipment or system efficiencies In the past, the difficulty in maintaining analog instrumentation often resulted in loss of the equipment that indicated efficiency of operation Sometimes the instrumentation was not operator friendly, so it was neglected and not maintained Contemporary digital instrumentation is relatively maintenance-free; with proper instructions at the beginning, this instrumentation should provide continued indication of operating conditions for the operators and managers of HVAC energy plants The great amount of data storage capacity of contemporary computer systems enables operators to maintain detailed records on operating parameters such as coefficient of performance, kilowatts per ton, and wire-to-water efficiency; sustained high efficiencies are now achievable through the interpretation of this information 305 Summary The emphasis in this book has been on making available the various expressions of efficiency in a form useable to the designer and system
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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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Summary of HVAC Energy Evaluations 614 Installing and Operating HVAC Pumps
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operator The elimination of older types of water system flow control such as balance valves, pressure-regulating valves, and most crossover bridges should be urged continuously to direct the designer toward the use of digital processes that aid in the rapid design of high-quality HVAC water systems It is obvious from all these simple algebraic equations that they are tools that can be inserted easily into computer programs to aid the efficient design and operation of HVAC water systems Every energy-consuming device that is proposed for an HVAC water system should be evaluated to see if it can be eliminated by changing the water system design The information, software, design expertise, and equipment are now available to achieve highly efficient water systems for the HVAC industry
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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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Source: HVAC Pump Handbook
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The Modern Two-Pipe Heating and Cooling System
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s 31 and 32 on two-pipe heating and cooling systems and advanced heat recovery procedures were the last chapters written in order to secure the latest information on these subjects and to emphasize their importance in energy conservation during the years to come Both of these chapters should be reviewed by anyone concerned about energy in schools and larger facilities in general Although pumps are not the major topic in these chapters, these energy-saving procedures would be difficult without properly controlled, variable-speed pumps 311 Introduction The two-pipe concept uses the same distribution network for heating in the winter and cooling in the summer It is an old idea, almost as old as hydronic cooling It is simple, cost effective, and logical As the name implies, there is a single supply line and a single return line that run hot water in the winter and chilled water in the summer, as opposed to a four-pipe system that has two dedicated hot water lines and two dedicated chilled water lines The two-pipe system uses the same lines to changeover from heating to cooling and vice-versa to meet the demands of the building It was a common system in the forties, fifties, and sixties but was generally relegated to the scrap heap of history due to inflexibility and chronic complaints about occupant comfort The most troublesome times would be spring and fall when warm days, cool nights is a common scenario, and when the outside temperature is around 60 F, not really warm enough to run airconditioning or cool enough to run the heating When two-pipe systems were used, it was generally on projects with limited budgets
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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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