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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of 200 0F (367 K) to determine the number of tubes required. It was found that 35 tubes could heat the water to the desired temperature, but since the ETC’s are only sold in sets of 10 tubes, 40 tubes were used. The mass flow rate was then adjusted to match the recommended flow for 40 tubes and the output temperature was calculated for a 40-tube system. The annual average for varying incidence angles is shown in Table 4.1. Table 4.1: Outlet Temperature of ETC Using 40 tubes To (K) Theta Annual Av 10 330.91 20 330.47 30 329.95 40 329.36 50 328.23 60 325.50 70 319.53 80 309.33 90 299.80 By looking at the basic equation of heat transfer one can see the temperature output varies linearly with the mass flow rate. This means the mass flow rate has a massive effect on the temperature output of the ETC’s. This is a problem for a STORC application because an ORC requires a large amount of heat input but at a relatively low temperature. This means a high mass flow rate is required for ORC’s but ETC’s are required to have low mass flow rates so the water can completely condense the glycol and absorb all the heat from the sun. A manufacturer has been quoted to say that it requires about 35,000 BTU/h to produce one kW/h from an ORC. The solar thermal system designed above is producing about 10,000 BTU/h. It will take about 208 parallel systems of these 40-tube ETC’s to produce about 60 90

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