Energy efficient use of low temperature
excess heat in industry
Tiina Järvinen
Aalto University
School of Engineering
Department of Energy Technology
11.3.2013
Doctoral Program in Energy Efficiency and Systems
/ EES Starting seminar
Tiina Järvinen
Contents
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Motivation
Aim of the research
Publications
On-going work for doctoral thesis:
Potential of excess heat in Finnish industry
Energy storage: Biomass drying
• Continuity for dissertation:
Heat recovery in moist air heat exchanger
Tiina Järvinen
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Motivation
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The European Union targets by 2020:
o To reach 20% savings in primary energy use
o To increase use of the renewable resources by 20%
o To decrease 20% CO2 emissions
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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.)
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EFEU research program (CLEEN)
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The Aim of the Research
 The industry is the most significant end user of energy/electricity.
 Energy efficient use of low temperature waste/excess heat in industry.
Finding means to use excess heat of the industry effectively.
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decreasing the primary energy need and the CO2 emissions.
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conversion and up-grading technologies (e.g. Conventional methods –heat
exchangers, Kalina cycle, ORC, heat pumps, drying…)
Tiina Järvinen
Publications
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2012: State of the art report:
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Järvinen, T. Technology characterization – Conversion and Up-grading Technologies for Low
Temperature Heat Source
2013-2014: Publications
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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
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Evaluation of theoretic potential to convert excess heat into electricity in the
industry (refining of metals, forest and chemical industry)
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Classic exergy analysis
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Speculation of realistic potential in industry to use excess heat
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Results indicate the total theoretical potential to be 6.9 TWh/y.
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To be submitted.
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Conference paper (PRES’13, 16th Conference Process Integration,
Modelling and Optimisation for Energy Saving and Pollution Reduction)
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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
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A case study / article
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In collaboration with Kumera Oy
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Harjavalta: pilot (indirect steam dryer and preheater)
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Theoretical model versus experimental data
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Heat recovery in moist air heat
exchanger
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THANK YOU
FOR YOUR ATTENTION!
Tiina Järvinen