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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1.5 Applications Organic Rankine cycles (ORC’s) can be used in a multitude of applications. Certain limitations exist on when and where an ORC can be used. ORC’s can be implemented on almost any process that produces exhaust. The input for an ORC can be either a hot vapor or a hot liquid, although most manufacturers recommend that a hot liquid is used because it is easier to keep clean and has higher heat transfer ability. If the exhaust heat is in the gaseous state then it is best to run it through a gas to liquid heat exchanger and heat water or thermal oil to be pumped into the ORC. The minimum temperature that an ORC can run is about 160 degrees Fahrenheit and the maximum temperature is about 220 degrees Fahrenheit. Most manufacturers recommend the waste heat input to be about 200 degrees Fahrenheit. If the waste heat is above 220 degrees Fahrenheit it is not a problem because a heat exchanger can be implemented to lower the temperature down to the desired 200 degrees Fahrenheit. Many applications exist where the waste heat is greater than 200 degrees Fahrenheit most of them are in the manufacturing industry. The biggest limitation to where an ORC can be installed is the mass flow rate of the waste heat. For example a 250 kilowatt ORC needs about 9 million BTU per hour input of heat at 200 degrees Fahrenheit. Examples of possible ORC implementations range from: rotary kilns used in concrete manufacturing, ovens used in pearlite manufacturing, prime movers- meaning big vehicles that are on for extended periods of time and have a high exhaust flow rate, as well as solar thermal applications. 13

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