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NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.

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NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications. ( nester-ryan-timothy-organic-rankine-cycles-comparative-study )

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The cost of a 250 kW ORC is $380,000, but this is not a turnkey system which means there are many other costs associated with the ORC. The initial cost does not include shipping either which was estimated to be about $5,000. The first hidden cost is the location for the ORC. The ORC must be centered on a 20’x10’x6” concrete pad, the cost of concrete is about $750 and the labor and construction cost was estimated to be about $900. The next hidden cost is the refrigerant within the ORC, which costs about $12/lb and requires about 1,500 lb yielding a cost of $18,000. A refrigerant technician is also required to fill the refrigerant and pressurize the system which will cost about $100. Since the ORC cannot accept the waste heat in the form of a gas it needs to be run through a heat exchanger which will cost approximately $10,000. The water tank needed to store the water used in this heat exchanger is estimated at about $10,000 for a 2,000 gallon tank. Pumps are required to move the water from the storage tank to the heat exchanger as well as from the nearby river to the condenser, which will cost a total of $21,300 for the two pumps. The pumps need to be a 750 gpm and a 1,250 gpm. The next cost associated with the ORC is the ductwork to connect the exhaust heat to the heat exchanger then to the ORC as well as the cooling water to the ORC, the ductwork was estimated to be about $2,000. A summary of these costs are shown in Table 3.1. 65

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