Consulting-Specifying Engineer - August 2008 - (Page 41) Anyone can claim to be flexible. 1500 1200 900 Hours 600 300 AERCO. Robust designs to meet all your project’s needs. Benchmark Boilers. Fuel savings for the most challenging applications. Benchmark boilers are delivered as fully assembled, doorway-sized units ready to support a variety of applications: variable flow rates, low gas pressure, low NOx, low return water temperatures, and dual fuel capable. In fact, they even help to streamline overall system designs to reduce project costs for upfront savings. To learn more visit www.aerco.com/bm2 0 50 150 250 350 450 550 650 750 850 950 1,050 1,150 Tonnage range Figure 3: San Diego Marina Marriott chilled water hours of operation based on tonnage range. Source: David Sellers load and allowing the test results guide the team to the optimization strategy. In the course of the effort, it also became apparent that the redundancy provided by the existing plant was not commensurate with the caliber of the facility. As a result, the owner released more money to add capacity to the system for peaking and reliability. By virtue of the MRCx process, the commissioning team had done a lot of trending and realized that one approach for selecting the chiller was to use a technique similar to that described for the boiler. By pulling hourly trend data for a year and doing a little bit of math, the commissioning team and design team painted a picture of the plant’s load profile as illustrated in Figure 3. This data allowed the project team to target chiller capacity and performance to optimize the new machine for the actual conditions it would see, as illustrated in Figure 4. The bottom line is that the new plant should deliver a kW per ton profile similar to what is shown by the blue line in Figure 2. Thus, the information gleaned from the ongoing operation of the building informed the design process to provide equipment that is closely tailored to its needs. The new chiller was installed in a location that had once served one of the original chillers for the facility. The old machine had been removed when the central plant was upgraded, but its condenser pumps and related piping remained intact and the Heat You Can Bank On Copyright 2008 AERCO International, Inc. Consulting-Specifying Engineer • AUGUST 2008 41 Input #224 at csemag m/quickResponse http://www.aerco.com/bm2 http://www.aerco.com/bm2 http://csemag.com/quickResponse
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