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|Title:||Experimental and numerical analyses on a plate heat exchanger with phase change for waste heat recovery at off-design conditions|
Di Battista, D
|Citation:||Journal of Physics: Conference Series, 2015, 655 pp. 012038 - 012038|
|Abstract:||This paper analyzes the performances of an evaporator for small scale waste heat recovery applications based on bottoming Organic Rankine Cycles with net output power in the range 2-5 kW. The heat recovery steam generator is a plate heat exchanger with oil as hot stream and an organic ﬂuid on the cold side. An experimental characterization of the heat exchanger was carried out at diﬀerent operating points measuring temperatures, pressures and ﬂow rates on both sides. The measurement data further allowed to validate a numerical model of the evaporator whereas heat transfer coeﬃcients were evaluated comparing several literature correlations, especially for the phase-change of the organic ﬂuid. With reference to a waste heat recovery application in industrial compressed air systems, multiple oﬀ-design conditions were simulated considering the eﬀects of oil mass ﬂow rate and temperature on the superheating of the organic ﬂuid, a key parameter to ensure a proper operation of the expansion machine, thus of the energy recovery process.|
|Appears in Collections:||Dept of Mechanical Aerospace and Civil Engineering Research Papers|
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