vb.net print barcode labels Configuring an HVAC Water System in Software

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Configuring an HVAC Water System
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Figure 97 257
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Campus-type chilled or hot water system
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Configuring an HVAC Water System 258 The HVAC World
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Figure 97b is a typical head variation for many campus buildings Most college and university campuses now utilize many energy-wasting devices such as balance valves, pressure-reducing valves, and crossover bridges to overcome this friction variation This system head area demonstrates how broad are the actual head requirements of a campus-type system For example, at 50 percent load on the building, the pump head can vary from 27 to 74 ft With constant-speed pumps, all this head difference must be destroyed by mechanical devices to maintain adequate flow to all parts of the building With the correct pumping arrangement and variable-speed pumps, all this wasted head can be eliminated With proper control, the variable-speed pump will always operate at the needed system flow and head without any overpressure or wasted energy A careful review of this figure will be made in Chap 15, as well as how pump performance is affected by such broad variations in system head
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933 Pumping system losses
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All the foregoing discussion has been for water system flow and head evaluation Losses through pumping systems themselves are often ignored or included with the system head losses It has been learned that pumping system losses can be significant and should be analyzed separately from the water system losses Figure 98a describes an end view of an actual pumping system consisting of five pumps, each with a capacity of 700 gal/min, for a total system capacity of 3500 gal/min The individual loss for each fitting is shown along with its K factor The total loss for the pump fittings is 69 ft Recognizing Hydraulic Institute s estimate that the losses in pipe fittings can vary by as much as 10 to 35 percent, these losses have been multiplied by plus 20 percent to achieve a reasonable loss for the fittings The losses for this system would therefore be 8 ft with 700 gal/min flowing through an individual pump Figure 98b is the pump curve for this system; each pump could operate at a maximum flow of 1100 gal/min if improperly controlled At 1100 gal/min, the pump fitting loss becomes (1100/700)190 8, or 189 ft A loss of only 8 ft may not raise much concern, but a loss of close to 19 ft should be of concern to anyone making a serious energy evaluation of this water system This system had a differential pressure of 30 ft across the largest coil and its control valve and a system loss of 78 ft With the estimated 8 ft of loss throughout the pump fittings, the total system loss becomes 116 ft Figure 98c describes the uniform system head curve for this system, which has been adjusted to recognize the variable loss through the pump fittings Again, no longer is the uniform system curve a smooth curve, but rather it is one of scalloped shape It is
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Configuring an HVAC Water System Configuring an HVAC Water System 259
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Friction losses for a pumping system
difficult to select the most efficient pump add points without a computer program similar to the energy programs that will be described in Chap 10 In this example, the pump add /subtract points in Fig 98c were set arbitrarily at 800 gal /min for each pump This is not
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