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04-13-15-R
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04-13-15-R
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4/13/2015 1:58:39 PM
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TCAAP Energy Integration Resiliency Framework <br />Energy Source Implementation <br /> <br /> <br /> 39 <br /> <br />Figure 7: Monthly site electric energy production by resource <br />3.2.3.3. CHP Plant System Components <br />One new packaged cogeneration unit could meet the energy needs presented above. Waste heat from <br />the engine cooling water loop and engine exhaust would be recovered to produce 1,372 MMBtu/hr of <br />hot water at full-load. The hot water would be delivered to a hot water distribution system to provide <br />heating energy to the Thumb and Town. The engine cooling water loop would produce 180-185 degree <br />hot water, which would be used to provide the necessary thermal energy for heating the buildings and <br />heating domestic hot water. A supplementary radiator located atop the CHP unit would remove heat <br />from the engine cooling water loop when there is no need for building heating during the summer <br />months. <br />In addition to the CHP plant, new hot water distribution piping and pumping would need to be installed <br />to provide hot water supply and return to the connected buildings from the CHP plant. This distribution <br />piping is assumed to be direct buried and would be routed as efficiently as possible to each of the <br />buildings’ central mechanical rooms. The district heating building interface, based on initial site <br />investigations, could be achieved through a direct connect interface allowing for a low-cost installation <br />at each building. The distribution configurations shown in Figure 8 are possible layouts for the initial <br />system, but the actual location of the plant and routing of the pipe will need to be determined in the <br />next stage of system development. <br />The full-load electric output of the genset is proposed to be 335kW at 480V. The genset power is <br />assumed to be electrically interconnected to provide power to the future facility located at the Thumb, <br />with standby and supplemental service provided by the electrical grid. The power from the CHP plant <br />would be delivered to each of the Thumb buildings behind the meter and would offset retail electric <br />purchases from Xcel Energy at the existing retail rate. For the economic evaluation, it was assumed the
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