Tiina Järvinen

Report
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
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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

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