Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses
The aim of this paper is to improve the operating share of a biomass cogeneration unit by using unavoidable heat waste heat recovered from a district network heating used for drying woody biomass’ return water (law-grade temperature heat). The optimal operating conditions of a drying unit...
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MDPI AG
2019-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/3/501 |
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| author | Tilia Dahou Patrick Dutournié Lionel Limousy Simona Bennici Nicolas Perea |
| author_facet | Tilia Dahou Patrick Dutournié Lionel Limousy Simona Bennici Nicolas Perea |
| author_sort | Tilia Dahou |
| collection | DOAJ |
| description | The aim of this paper is to improve the operating share of a biomass cogeneration unit by using unavoidable heat waste heat recovered from a district network heating used for drying woody biomass’ return water (law-grade temperature heat). The optimal operating conditions of a drying unit added to the system were estimated from an energy and a financial point of view, applying four objective functions (drying time, energy consumption, energy balance, and financial performance of the cogeneration unit). An experimental design methodology used heat for the implementation of these functions and to obtain an operating chart. Numerical modelling was performed to develop a simulation tool able to illustrate the unsteady operations able to take into account the available waste heat. Surprisingly, the model shows that the right strategy to increase the financial gain is to produce more warm water than necessary and to consequently dispose higher quantities of unavoidable heat in the network’s return water, which heat up the drying air at a higher temperature. This result contrasts with the current approaches of setting-up cogeneration units that are based on the minimization of the heat production. |
| first_indexed | 2024-04-11T12:53:17Z |
| format | Article |
| id | doaj.art-d5c2e6e9a063448dbca04e2c39f3a89c |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T12:53:17Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-d5c2e6e9a063448dbca04e2c39f3a89c2022-12-22T04:23:08ZengMDPI AGEnergies1996-10732019-02-0112350110.3390/en12030501en12030501Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic AnalysesTilia Dahou0Patrick Dutournié1Lionel Limousy2Simona Bennici3Nicolas Perea4Institut des Sciences des Matériaux de Mulhouse IS2M-UMR 7361CNRS-UHA, 3 bis rue A, Werner, 68098 Mulhouse CEDEX, FranceInstitut des Sciences des Matériaux de Mulhouse IS2M-UMR 7361CNRS-UHA, 3 bis rue A, Werner, 68098 Mulhouse CEDEX, FranceInstitut des Sciences des Matériaux de Mulhouse IS2M-UMR 7361CNRS-UHA, 3 bis rue A, Werner, 68098 Mulhouse CEDEX, FranceInstitut des Sciences des Matériaux de Mulhouse IS2M-UMR 7361CNRS-UHA, 3 bis rue A, Werner, 68098 Mulhouse CEDEX, FranceRéseaux de Chaleur Urbain d’Alsace (RCUA) 17 Place des Halles, 67000 Strasbourg, FranceThe aim of this paper is to improve the operating share of a biomass cogeneration unit by using unavoidable heat waste heat recovered from a district network heating used for drying woody biomass’ return water (law-grade temperature heat). The optimal operating conditions of a drying unit added to the system were estimated from an energy and a financial point of view, applying four objective functions (drying time, energy consumption, energy balance, and financial performance of the cogeneration unit). An experimental design methodology used heat for the implementation of these functions and to obtain an operating chart. Numerical modelling was performed to develop a simulation tool able to illustrate the unsteady operations able to take into account the available waste heat. Surprisingly, the model shows that the right strategy to increase the financial gain is to produce more warm water than necessary and to consequently dispose higher quantities of unavoidable heat in the network’s return water, which heat up the drying air at a higher temperature. This result contrasts with the current approaches of setting-up cogeneration units that are based on the minimization of the heat production.https://www.mdpi.com/1996-1073/12/3/501unavoidable heat wasteefficiencybiomass dryingfinancial gain |
| spellingShingle | Tilia Dahou Patrick Dutournié Lionel Limousy Simona Bennici Nicolas Perea Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses Energies unavoidable heat waste efficiency biomass drying financial gain |
| title | Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses |
| title_full | Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses |
| title_fullStr | Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses |
| title_full_unstemmed | Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses |
| title_short | Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses |
| title_sort | recovery of low grade heat heat waste from a cogeneration unit for woodchips drying energy and economic analyses |
| topic | unavoidable heat waste efficiency biomass drying financial gain |
| url | https://www.mdpi.com/1996-1073/12/3/501 |
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