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The Use of Water in HVAC Systems
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81 Efficiency of Operation The use of water in HVAC systems has been much like the ordinary use of water in our civilization Water has been plentiful and cheap, so why not use it Such has been the situation in HVAC water systems Now the cost of energy to move water through these systems is no longer less than a penny per kilowatthour, and water itself should be conserved Conservation must be practiced, and we have the tools to achieve the efficient use of pumping energy in HVAC water systems The development of digital electronics has opened the door to the achievement of higher efficiency in the movement of water through these systems This added efficiency is most pronounced in hot water, chilled water, and condenser water systems in the HVAC field The elimination of energy-consuming mechanical devices, the use of variablespeed pumps, and the wiser control of water temperatures to increase the efficiency of boilers and chillers have all brought conservation of energy in the HVAC field The major users of water and pumping energy in the HVAC field are chilled, condenser, hot, and boiler feed water This chapter reviews the design considerations that are common to all these systems Later chapters will be devoted to the specific design requirements for each of the water systems Energy consumption is a major concern for all these systems For hot water systems, the development of the condensing-type boiler has brought a much higher level of boiler efficiency, over 90 percent compared with the traditional 80 percent for noncondensing boilers This means also that hot water systems need not be designed with
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The Use of Water in HVAC Systems 210 The HVAC World
higher water temperatures to avoid condensing Noncondensing boilers cannot operate with water at temperatures below 140 F The development of the condensing boiler has enabled the designer to select great differential temperatures between the supply and return temperatures This has reduced appreciably the water flow and, therefore, the pump flow and horsepower Likewise, on chilled water systems, it is recognized that chillers operate at lower kilowatt per ton rates with higher chilled water temperatures In recognition of these facts, HVAC water systems should be designed for lower hot water temperatures and higher chilled water temperatures Reset of system water temperature at boilers or chillers should be used rather than zone reset in most cases Zone reset should use efficient pumping such as distributed pumping, which will be described in Chaps 15 and 20 on chilled and hot water distribution systems Condenser water systems are realizing greater efficiencies through the use of variable-speed pumps The types of controls that are available today for removing heat from the chillers have allowed the use of these variable-speed condenser pumps The consumption of energy for boiler feedwater is relatively less than that for the other major HVAC water systems
811 Determination of useful energy
The advent of digital electronics, as discussed in Chap 1, provides the means to determine rapidly the efficient use of pumping energy for all HVAC water systems It remains for us to develop what is efficient use and what is not Following are some guidelines that will help us in this determination of the value of various practices that consume pumping energy
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