Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources
Organic Rankine Cycle (ORC) is one of the most prominent technologies for power generation from waste heat sources. Due to their nature, as residual energy from an upstream process, waste heat sources typically present a fluctuating behavior that makes the recovery of the waste heat a challenging ta...
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| Format: | Journal Article |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/140836 |
| _version_ | 1826125732967874560 |
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| author | Jiménez-Arreola, Manuel Pili, Roberto Wieland, Christoph Romagnoli, Alessandro |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Jiménez-Arreola, Manuel Pili, Roberto Wieland, Christoph Romagnoli, Alessandro |
| author_sort | Jiménez-Arreola, Manuel |
| collection | NTU |
| description | Organic Rankine Cycle (ORC) is one of the most prominent technologies for power generation from waste heat sources. Due to their nature, as residual energy from an upstream process, waste heat sources typically present a fluctuating behavior that makes the recovery of the waste heat a challenging task. Direct evaporation from the waste heat carrier has gained substantial interest, especially on volume and weight sensitive applications where the introduction of an additional intermediary thermal oil heat exchanger can hinder the feasibility of the system. Because of the highly dynamic operation of direct evaporators under fluctuating waste heat sources, it is important to consider the thermal response time of the evaporator already at the design stage. In this paper, a systematic analysis and comparison of the dynamic response of two types of ORC evaporators for direct heat transfer between an exhaust gas and the organic working fluid is performed. Based on detailed dynamic models and simulations, maps are built to highlight in a generalized, compact and systematic way the dependence of the thermal response time of the evaporators on the geometric design and boundary conditions and its implications on the weight, volume and pressure drops. The analysis and application of the methodology to diesel engines long haul duty trucks, shows that fin and tube evaporators with large tube diameters and small cross-sectional areas of the exhaust side are the preferred option for high thermal inertia design, while louver fin multi-port flat tubes evaporators with large port diameters are better for fast response, despite the high pressure drops. |
| first_indexed | 2024-10-01T06:41:10Z |
| format | Journal Article |
| id | ntu-10356/140836 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:41:10Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1408362021-01-06T05:17:59Z Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources Jiménez-Arreola, Manuel Pili, Roberto Wieland, Christoph Romagnoli, Alessandro School of Mechanical and Aerospace Engineering Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU (ERI@N) Engineering::Mechanical engineering Organic Rankine Cycle Waste Heat Recovery Organic Rankine Cycle (ORC) is one of the most prominent technologies for power generation from waste heat sources. Due to their nature, as residual energy from an upstream process, waste heat sources typically present a fluctuating behavior that makes the recovery of the waste heat a challenging task. Direct evaporation from the waste heat carrier has gained substantial interest, especially on volume and weight sensitive applications where the introduction of an additional intermediary thermal oil heat exchanger can hinder the feasibility of the system. Because of the highly dynamic operation of direct evaporators under fluctuating waste heat sources, it is important to consider the thermal response time of the evaporator already at the design stage. In this paper, a systematic analysis and comparison of the dynamic response of two types of ORC evaporators for direct heat transfer between an exhaust gas and the organic working fluid is performed. Based on detailed dynamic models and simulations, maps are built to highlight in a generalized, compact and systematic way the dependence of the thermal response time of the evaporators on the geometric design and boundary conditions and its implications on the weight, volume and pressure drops. The analysis and application of the methodology to diesel engines long haul duty trucks, shows that fin and tube evaporators with large tube diameters and small cross-sectional areas of the exhaust side are the preferred option for high thermal inertia design, while louver fin multi-port flat tubes evaporators with large port diameters are better for fast response, despite the high pressure drops. 2020-06-02T06:56:45Z 2020-06-02T06:56:45Z 2018 Journal Article Jiménez-Arreola, M., Pili, R., Wieland, C., & Romagnoli, A. (2018). Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources. Applied Energy, 216, 724-740. doi:10.1016/j.apenergy.2018.01.085 0306-2619 https://hdl.handle.net/10356/140836 10.1016/j.apenergy.2018.01.085 2-s2.0-85042494523 216 724 740 en Applied Energy © 2018 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Organic Rankine Cycle Waste Heat Recovery Jiménez-Arreola, Manuel Pili, Roberto Wieland, Christoph Romagnoli, Alessandro Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources |
| title | Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources |
| title_full | Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources |
| title_fullStr | Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources |
| title_full_unstemmed | Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources |
| title_short | Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources |
| title_sort | analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in orc waste heat recovery applications from fluctuating sources |
| topic | Engineering::Mechanical engineering Organic Rankine Cycle Waste Heat Recovery |
| url | https://hdl.handle.net/10356/140836 |
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