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Composition optimisation of working fluids for Organic Rankine Cycles and Kalina cycles

Title
Composition optimisation of working fluids for Organic Rankine Cycles and Kalina cycles
Author
김진국
Keywords
Organic Rankine Cycles; Kalina cycles; Mixed fluids; Optimisation
Issue Date
2013-06
Publisher
Elsevier Ltd
Citation
Energy : technologies, resources, reserves, demands, impact, conservation, management, policy, 2013, 55, p.114 - 126
Abstract
An optimisation model for the composition of mixed working fluids for (Organic Rankine Cycles) ORCs and Kalina cycles has been developed. The temperatures investigated were 100 o C-250 o C for the heat source and 30 o C for the heat sink. The optimisation method of the composition was carried out with Simulated Annealing technique with the objective function of maximising the thermal efficiency of the cycle, based on 1 MW of heat source. The results show that the pure component organic fluids are more energy-efficient than mixed organic fluids. The selection of organic working fluids was studied for achieving maximum cycle efficiency at a given operating temperature. The composition of the Kalina cycle was also optimised and it was found that for a maximum temperature of 250 o C, the minimum ammonia concentration in the ammonia-water mixture was 73.8% mol fraction. A novel consideration of employing alcohol-water mixtures in the cycle was also investigated and the most efficient mixture at 250 o C was methanol and water mixture when compared to the Kalina cycle and steam Rankine Cycle. The study showed overall that the optimal choice of working fluids for a particular type of cycle would depend on the operating temperature and pressure. The developed design method can be useful for engineers to evaluate the performance of the cycles considering a wide range of working fluids, and determines the optimal choice of working fluids and operating conditions of the cycle.
URI
https://www.sciencedirect.com/science/article/pii/S036054421300265X?via%3Dihubhttp://hdl.handle.net/20.500.11754/45517
ISSN
0360-5442
DOI
10.1016/j.energy.2013.03.069
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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