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Development and validation of a single-piston free piston expander-linear generator for a small-scale organic Rankine cycle
To improve the energy efficiency of internal combustion engines, this study develops a single-piston free piston expander-linear generator (FPE-LG) for a small scale organic Rankine cycle (ORC) in a waste heat recovery system. The prototype can operate continuously and stably, thereby indicating tha...
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Published in: | Energy (Oxford) 2018-10, Vol.161, p.809-820 |
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creator | Tian, Yaming Zhang, Hongguang Li, Jian Hou, Xiaochen Zhao, Tenglong Yang, Fubin Xu, Yonghong Wang, Xin |
description | To improve the energy efficiency of internal combustion engines, this study develops a single-piston free piston expander-linear generator (FPE-LG) for a small scale organic Rankine cycle (ORC) in a waste heat recovery system. The prototype can operate continuously and stably, thereby indicating that the single-piston FPE-LG has a feasible working principle. The operation characteristics of FPE-LG are revealed, and the effects of the intake valve opening time (IVOT) and the exhaust valve opening time (EVOT) on the output performance are investigated. The experimental results reveal that the piston can run at a relatively high velocity near the dead centers, and peak acceleration is typically achieved when the piston arrives at the operation left/right dead centers (OLDC/ORDC). The piston stroke length is decreased significantly as the operating frequency is increased. The peak power output, peak in-cylinder pressure, peak velocity of the free piston, and utilization ratio of the piston stroke (η) are increased as the external load resistance is increased. In addition, η increases with longer IVOT and can reach up to 67.4% when the IVOT is 40 ms. The exhaust pressure decreases as the EVOT is increased, and the power output can be improved by regulating the IVOT rather than the EVOT.
•A novel test rig of single-piston free piston expander-linear generator prototype is developed.•Performances and working principles of the single-piston FPE-LG are presented.•The concept of the utilization ratio of piston stroke length (η) is proposed.•Effects of intake/exhaust valve opening time on the FPE-LG performance are investigated. |
doi_str_mv | 10.1016/j.energy.2018.07.192 |
format | article |
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•A novel test rig of single-piston free piston expander-linear generator prototype is developed.•Performances and working principles of the single-piston FPE-LG are presented.•The concept of the utilization ratio of piston stroke length (η) is proposed.•Effects of intake/exhaust valve opening time on the FPE-LG performance are investigated.</description><identifier>ISSN: 0360-5442</identifier><identifier>EISSN: 1873-6785</identifier><identifier>DOI: 10.1016/j.energy.2018.07.192</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Cylinders ; Energy efficiency ; Engine valves ; Exhaust ; Free piston expander–linear generator ; Generators ; Heat recovery ; Heat recovery systems ; Internal combustion engines ; Load resistance ; Organic Rankine cycle ; Output performance ; Pressure ; Prototype test ; Prototypes ; Rankine cycle ; Velocity ; Waste heat recovery</subject><ispartof>Energy (Oxford), 2018-10, Vol.161, p.809-820</ispartof><rights>2018 Elsevier Ltd</rights><rights>Copyright Elsevier BV Oct 15, 2018</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c334t-6ac3afe02ef73b19292e74f36309b92e4bc027ea22c4962e456a2024004195623</citedby><cites>FETCH-LOGICAL-c334t-6ac3afe02ef73b19292e74f36309b92e4bc027ea22c4962e456a2024004195623</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Tian, Yaming</creatorcontrib><creatorcontrib>Zhang, Hongguang</creatorcontrib><creatorcontrib>Li, Jian</creatorcontrib><creatorcontrib>Hou, Xiaochen</creatorcontrib><creatorcontrib>Zhao, Tenglong</creatorcontrib><creatorcontrib>Yang, Fubin</creatorcontrib><creatorcontrib>Xu, Yonghong</creatorcontrib><creatorcontrib>Wang, Xin</creatorcontrib><title>Development and validation of a single-piston free piston expander-linear generator for a small-scale organic Rankine cycle</title><title>Energy (Oxford)</title><description>To improve the energy efficiency of internal combustion engines, this study develops a single-piston free piston expander-linear generator (FPE-LG) for a small scale organic Rankine cycle (ORC) in a waste heat recovery system. The prototype can operate continuously and stably, thereby indicating that the single-piston FPE-LG has a feasible working principle. The operation characteristics of FPE-LG are revealed, and the effects of the intake valve opening time (IVOT) and the exhaust valve opening time (EVOT) on the output performance are investigated. The experimental results reveal that the piston can run at a relatively high velocity near the dead centers, and peak acceleration is typically achieved when the piston arrives at the operation left/right dead centers (OLDC/ORDC). The piston stroke length is decreased significantly as the operating frequency is increased. The peak power output, peak in-cylinder pressure, peak velocity of the free piston, and utilization ratio of the piston stroke (η) are increased as the external load resistance is increased. In addition, η increases with longer IVOT and can reach up to 67.4% when the IVOT is 40 ms. The exhaust pressure decreases as the EVOT is increased, and the power output can be improved by regulating the IVOT rather than the EVOT.
•A novel test rig of single-piston free piston expander-linear generator prototype is developed.•Performances and working principles of the single-piston FPE-LG are presented.•The concept of the utilization ratio of piston stroke length (η) is proposed.•Effects of intake/exhaust valve opening time on the FPE-LG performance are investigated.</description><subject>Cylinders</subject><subject>Energy efficiency</subject><subject>Engine valves</subject><subject>Exhaust</subject><subject>Free piston expander–linear generator</subject><subject>Generators</subject><subject>Heat recovery</subject><subject>Heat recovery systems</subject><subject>Internal combustion engines</subject><subject>Load resistance</subject><subject>Organic Rankine cycle</subject><subject>Output performance</subject><subject>Pressure</subject><subject>Prototype test</subject><subject>Prototypes</subject><subject>Rankine cycle</subject><subject>Velocity</subject><subject>Waste heat recovery</subject><issn>0360-5442</issn><issn>1873-6785</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9UE2L2zAQFWULzab9Bz0I9mx39GHZvhSW7EcLgYWlPQtFHgeliuSVnLChf74KybmHYT54783MI-Qrg5oBU992NQZM21PNgXU1tDXr-QeyYF0rKtV2zQ1ZgFBQNVLyT-Q25x0ANF3fL8jfBzyij9Mew0xNGOjReDeY2cVA40gNzS5sPVaTy3MZjQmRXmt8nwoBU-VdQJPo9nyEmWOiY4nC3Bvvq2yNRxrT1gRn6asJfwqa2pP1-Jl8HI3P-OWal-T30-Ov1Y9q_fL8c3W_rqwQcq6UscKMCBzHVmzKaz3HVo5CCeg3pZYbC7xFw7mVvSp9owwHLgEk6xvFxZLcXXSnFN8OmGe9i4cUykrNGYceVNdCQckLyqaYc8JRT8ntTTppBvpss97pi836bLOGVpdbCu37hYblg6PDpLN1GCwOLqGd9RDd_wX-ARpDiRM</recordid><startdate>20181015</startdate><enddate>20181015</enddate><creator>Tian, Yaming</creator><creator>Zhang, Hongguang</creator><creator>Li, Jian</creator><creator>Hou, Xiaochen</creator><creator>Zhao, Tenglong</creator><creator>Yang, Fubin</creator><creator>Xu, Yonghong</creator><creator>Wang, Xin</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7ST</scope><scope>7TB</scope><scope>8FD</scope><scope>C1K</scope><scope>F28</scope><scope>FR3</scope><scope>KR7</scope><scope>L7M</scope><scope>SOI</scope></search><sort><creationdate>20181015</creationdate><title>Development and validation of a single-piston free piston expander-linear generator for a small-scale organic Rankine cycle</title><author>Tian, Yaming ; Zhang, Hongguang ; Li, Jian ; Hou, Xiaochen ; Zhao, Tenglong ; Yang, Fubin ; Xu, Yonghong ; Wang, Xin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c334t-6ac3afe02ef73b19292e74f36309b92e4bc027ea22c4962e456a2024004195623</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Cylinders</topic><topic>Energy efficiency</topic><topic>Engine valves</topic><topic>Exhaust</topic><topic>Free piston expander–linear generator</topic><topic>Generators</topic><topic>Heat recovery</topic><topic>Heat recovery systems</topic><topic>Internal combustion engines</topic><topic>Load resistance</topic><topic>Organic Rankine cycle</topic><topic>Output performance</topic><topic>Pressure</topic><topic>Prototype test</topic><topic>Prototypes</topic><topic>Rankine cycle</topic><topic>Velocity</topic><topic>Waste heat recovery</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tian, Yaming</creatorcontrib><creatorcontrib>Zhang, Hongguang</creatorcontrib><creatorcontrib>Li, Jian</creatorcontrib><creatorcontrib>Hou, Xiaochen</creatorcontrib><creatorcontrib>Zhao, Tenglong</creatorcontrib><creatorcontrib>Yang, Fubin</creatorcontrib><creatorcontrib>Xu, Yonghong</creatorcontrib><creatorcontrib>Wang, Xin</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Environment Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Energy (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tian, Yaming</au><au>Zhang, Hongguang</au><au>Li, Jian</au><au>Hou, Xiaochen</au><au>Zhao, Tenglong</au><au>Yang, Fubin</au><au>Xu, Yonghong</au><au>Wang, Xin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Development and validation of a single-piston free piston expander-linear generator for a small-scale organic Rankine cycle</atitle><jtitle>Energy (Oxford)</jtitle><date>2018-10-15</date><risdate>2018</risdate><volume>161</volume><spage>809</spage><epage>820</epage><pages>809-820</pages><issn>0360-5442</issn><eissn>1873-6785</eissn><abstract>To improve the energy efficiency of internal combustion engines, this study develops a single-piston free piston expander-linear generator (FPE-LG) for a small scale organic Rankine cycle (ORC) in a waste heat recovery system. The prototype can operate continuously and stably, thereby indicating that the single-piston FPE-LG has a feasible working principle. The operation characteristics of FPE-LG are revealed, and the effects of the intake valve opening time (IVOT) and the exhaust valve opening time (EVOT) on the output performance are investigated. The experimental results reveal that the piston can run at a relatively high velocity near the dead centers, and peak acceleration is typically achieved when the piston arrives at the operation left/right dead centers (OLDC/ORDC). The piston stroke length is decreased significantly as the operating frequency is increased. The peak power output, peak in-cylinder pressure, peak velocity of the free piston, and utilization ratio of the piston stroke (η) are increased as the external load resistance is increased. In addition, η increases with longer IVOT and can reach up to 67.4% when the IVOT is 40 ms. The exhaust pressure decreases as the EVOT is increased, and the power output can be improved by regulating the IVOT rather than the EVOT.
•A novel test rig of single-piston free piston expander-linear generator prototype is developed.•Performances and working principles of the single-piston FPE-LG are presented.•The concept of the utilization ratio of piston stroke length (η) is proposed.•Effects of intake/exhaust valve opening time on the FPE-LG performance are investigated.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.energy.2018.07.192</doi><tpages>12</tpages></addata></record> |
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subjects | Cylinders Energy efficiency Engine valves Exhaust Free piston expander–linear generator Generators Heat recovery Heat recovery systems Internal combustion engines Load resistance Organic Rankine cycle Output performance Pressure Prototype test Prototypes Rankine cycle Velocity Waste heat recovery |
title | Development and validation of a single-piston free piston expander-linear generator for a small-scale organic Rankine cycle |
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