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guarantees that a pumping system is operating at optimal efficiency Data on wire-to-water efficiency can be fed into computer memory and recalled to verify if current operation is similar to that when the system was commissioned Load increases, due to system changes, may dictate the need to reset the points of addition and subtraction of pumps Wire-to-water efficiency degradation indicates system changes, improper operation, or dirty equipment Many rigid, real-time maintenance schedules are unnecessary when operational parameters such as wire-to-water efficiency are used to provide a running evaluation of the pumping equipment With such information on a computer screen, it will advise the operator when pumps should be serviced or repaired Usually, it is unnecessary to periodically disassemble an HVAC pump on some theoretical maintenance schedule when computer data on the pump s operation is available to the operator 287 Summation As with any mechanical equipment, good housekeeping always promotes longer life for pumps, motors, and electrical switchgear The preceding practices, along with the pump operation recommended in Chap 28, should provide long pump and motor operation with a minimum of maintenance The pump or pumping system manufacturer s installation, operation, and maintenance instructions should be reread to ensure compliance Are these instructions located at a known place in the maintenance offices Noise, heat, vibration, and continual speed changes have no place in a well-designed and properly controlled pumping system The quality of pumping equipment and operational procedures available today should provide HVAC pumping systems that are relatively free of maintenance
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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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291 Introduction There are so many HVAC water systems in operation and designed to the old constant-speed mechanical control procedures that it is important that a chapter of this book be devoted to retrofit of these existing systems Some of this chapter will be a reprise of other chapters and will utilize the information provided in them There have been earlier discussions of energy waste in existing systems, for example, the reference to the system with balance valves on pump discharges that wasted over 900,000 kWh per year Any water system with a preponderance of balance valves should be studied for energy savings by eliminating them through the use of the various system analyses offered herein 292 System Evaluation This chapter will try to develop a systematic evaluation of existing systems in the hope that the systems with the greatest potential for savings in energy and maintenance will be highlighted
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2921 Evaluating existing systems
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Water systems will be evaluated first by the number of mechanical devices used to control water flow and pressure in these older systems Most of these systems will be found in the distribution of chilled and hot water; chilled water is usually the best candidate because of the higher flows, heads, and energy consumption
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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
Retrofitting Existing HVAC Water Systems 598 Installing and Operating HVAC Pumps
The existence of the following mechanical equipment in a system will point the way to possibilities for energy savings: 1 Pressure regulators on pump discharges 2 Manual or automatic balance valves on pump discharges 3 Pressure-reducing valves anywhere in a system 4 Balance valves on zones in heating and cooling systems 5 Crossover bridges that equalize pump pressure 6 Circulating pumps in series with heating or cooling coils All these devices can waste energy, and their existence is an indicator that the system should be evaluated
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