Energy efficient use of low temperature excess heat in industry
Tiina Järvinen Aalto UniversitySchool of EngineeringDepartment of Energy Technology
11.3.2013
Tiina Järvinen
Doctoral Program in Energy Efficiency and Systems / EES Starting seminar
Contents
• Motivation
• Aim of the research
• Publications
• On-going work for doctoral thesis:Potential of excess heat in Finnish industryEnergy storage: Biomass drying
• Continuity for dissertation:Heat recovery in moist air heat exchanger
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Motivation
• The European Union targets by 2020: o To reach 20% savings in primary energy useo To increase use of the renewable resources by 20%o To decrease 20% CO2 emissions
• The energy efficiency is consistently identified as an essential means of moving to a more sustainable energy future. Energy efficiency curbs energy demand growth, reduces energy imports and mitigates pollution. (World Energy Outlook, 2012. International Energy Agency.)
• EFEU research program (CLEEN)
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The Aim of the Research
Tiina Järvinen
Þ The industry is the most significant end user of energy/electricity.Þ Energy efficient use of low temperature waste/excess heat in industry.
Finding means to use excess heat of the industry effectively.
• decreasing the primary energy need and the CO2 emissions.
• conversion and up-grading technologies (e.g. Conventional methods –heat exchangers, Kalina cycle, ORC, heat pumps, drying…)
Publications
• 2012: State of the art report:– Järvinen, T. Technology characterization – Conversion and Up-grading Technologies for
Low Temperature Heat Source
• 2013-2014: Publications– Järvinen, T. & Holmberg, H. Theoretical Potential to Convert Excess Heat into Mechanical
Work in the Finnish Industry . Conference paper (PRES’13, 16th Conference Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction), abstract accepted, to be submitted.
– Järvinen, T. & Holmberg, H. & Hillamo, H. Energy storage: Biomass drying with low temperature heat
– Järvinen, T. et al. Heat recovery in moist air heat exchanger (modified processes to reduce primary energy consumption)
Tiina Järvinen
On-going work for doctoral thesis:Potential of excess heat in Finnish industry
• Evaluation of theoretic potential to convert excess heat into electricity in the industry (refining of metals, forest and chemical industry)
• Classic exergy analysis
• Speculation of realistic potential in industry to use excess heat
• Results indicate the total theoretical potential to be 6.9 TWh/y.
• To be submitted.
• Conference paper (PRES’13, 16th Conference Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction)
• Main reference of the paper: Utilization of excess heat of the industry in district heating. (In Finnish) [Teollisuuden ylijäämälämmön hyödyntäminen kaukolämmityksessä, YIT Teollisuus- ja verkkopalvelut Oy, Projekti numero 860308.] 2010.
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On-going work for doctoral thesis:Energy storage: Biomass drying
• Drying as heat recovery unit -> increases LHV of biomass.
• Heat source at low temperature (excess heat, solar energy)
• Experimental research (drying equipment in Aalto, Drying of woodchips) -> drying curves from the experimental data
• Focus of the article on the drying process
Tiina Järvinen
Energy storage: Biomass drying
Tiina Järvinen
Continuity for dissertation:Heat recovery in moist air heat exchanger
• A case study / article
• In collaboration with Kumera Oy
• Harjavalta: pilot (indirect steam dryer and preheater)
• Theoretical model versus experimental data
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Heat recovery in moist air heat exchanger
Tiina Järvinen
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THANK YOU FOR YOUR ATTENTION!
Tiina Järvinen
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