Organic Brayton Cycles with solid sorption thermal compression for low grade heat utilization |
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| Affiliation: | 1. Dept. of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India;2. Dept. of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore;3. Dept. of Mechanical Engineering, Indian Institute of Technology, Chennai 600036, India;1. National Kaohsiung University of Applied Sciences, 415 Jiangong Road, Sanmin District, Kaohsiung 80778, Taiwan;2. National Kaohsiung Marine University, 142 Hai-Jhuan Road, Nanzih District, Kaohsiung 81143, Taiwan;1. Institute of Turbomachinery, Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, China;3. School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China |
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| Abstract: | While organic Rankine cycles have been widely used for power generation using low grade thermal energy, Brayton cycles have not been considered feasible because the work required to compress the gas nearly compensates the turbine work output. However, if the low grade energy can be used for thermal compression of the working fluid, it may be possible to gainfully operate the Brayton cycle. With this in mind, a solid sorption based Brayton cycle is proposed in this paper. R134a, CO2, R507a, propane, R32 and R410a with activated carbon as sorbent, were considered in this proof-of-concept study due to the ready availability of adsorption data. Even though the thermal efficiency is low (<8%), the proposed scheme could add an option for distributed power generation using solar or waste heat. It is found that if irreversibilities in turbine and thermal compression are considered R32 gives a better performance than CO2 and R410a. |
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| Keywords: | Organic Brayton Cycle (OBC) Solid sorption Thermal compression Activated carbon |
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