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Applying Equation 7-7 and substituting the size of the proposed ORC models Pg 199.40kW gives the cost of the proposed ORC system as US$437,898.58 (£282,223.89). Estimation of Cost of R245fa Working Fluid used in the Proposed Dual Heat Source ORC Model The price list for the ORC systems provided by the ORC manufacturer (Infinity Turbine®) does not include the price of the R245fa working fluid. The cost of this is obtained from R245fa refrigerant vendor (an extract of the chat with the vendor is shown in Appendix C). This is given as US$9.85/kg (£6.35/kg), with a shipping cost to the UK of US$1300/container (£837.84/container). Each container contains 14 cylinders, each of 1,000 kg. This gives a shipping cost of US$0.09/kg (£0.06/kg). Hence, the total cost of the R245fa refrigerant including shipping is given as US$9.94/kg (£6.41/kg). From information obtained from one of the ORC manufacturers, an ORC with capacity of about 200 kW would require a refrigerant charge of about 250 kg (Brasz and Zyhowski, 2005). Based on this, the cost of refrigerant for the proposed ORC system would be US$2,485.00 (£1601.57). Estimation of Combined Installation, Material and Labour Costs The installation cost of the ORC system, as a retrofit project to an existing plant, is estimated using correlation obtained from a similar project in which an ORC system was integrated as a retrofit project to an existing biomass plant to achieve a Combined Heat and Power (CHP) application at Lienz, Austria. From the study carried out by the ORC manufacturer (Turboden, Italy), it was found that the installation cost (including fittings) of a 1,000 kWe 159PDF Image | OPTIMISING THERMAL ENERGY RECOVERY
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