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Low Exergy Heating and Cooling increased energy efficiency and improved comfort


What we did to solve them. Solutions we found ... Poland: Technical University of Silesia. IEA. ECBCS. Annex 37. Why we did it - Objectives ... – PowerPoint PPT presentation

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Title: Low Exergy Heating and Cooling increased energy efficiency and improved comfort

Low Exergy Heating and Cooling-increased energy
efficiency and improved comfort?
  • Mia Ala-Juusela
  • VTT Building and Transport
  • Finland
  • e-mail Mia.Ala-Juusela_at_vtt.fi

Contents of the presentation
  • Background
  • Problems we tried to solve
  • What we did to solve them
  • Solutions we found
  • New problems and possibilities we found on the
    way future cooperation

The quality of energy
Sources of energy at 20 oC
High valuedenergy sources
Low valued energy sources
Problems we tried to solve
  • 1 The arguments for use of LowEx systems were not
    presented in a reliable way.
  • 2 Designers and architects did not know what kind
    of LowEx solutions exist on the market.
  • 3 The potential of exergy analysis in comparing
    the systems was not common knowledge.
  • 4 The importance of the quality of energy was not
    recognised in general.

One problem, we did not try to solve, but solved
during the work
  • 5 The relation between thermal comfort and
    optimal values for mean radiant temperature and
    mean room temperature was known by experienced
    scientists and designers, but methods to prove
    this scientifically did not exist.

We did it - the LowEx group
  • Finland VTT Building and Transport
  • Italy Ente per le Nuove Tecnologie, lEnergia e
    lAmbiente (ENEA)
  • Japan Musashi Institute of Technology
  • Netherlands Cauberg-Huygen R.I and NOVEM
  • Norway Norwegian Building Research Institute
  • Canada Natural Resources Canada
  • France Centre Sqientifique et Technique du
    Batiment (CSTB)
  • Sweden Royal Institute of Technology, Building
  • Denmark Esbensen Consulting Engineers and
    Technical University of Denmark
  • Germany TU Braunschweig Institut für Gebäude-
    und Solartechnik and D.F. Liedelt "Velta" GmbH
  • Poland Technical University of Silesia

Why we did it - Objectives
  • The general objective of the Annex 37 is to
    promote the rational use of energy by means of
    facilitating and accelerating the use of low
    valued and environmentally sustainable energy
    sources for heating and cooling of buildings.

How we did it - Subtasks
  • Subtask A (Canada) Exergy Analysis Tools for the
    Built Environment
  • Subtask B (Sweden) Low Exergy Concepts and
  • Subtask C (Netherlands) Case Studies and Market
  • Subtask D (Finland) Documentation and

Solutions to problem 1
  • Arguments for the use of LowEx systems were
    collected to be able to present them in a
    reliable way
  • an occupants survey,
  • a litterature study
  • experiences from the cases
  • human body exergy analyses

Solutions to problem 1
  • All prove, that LowEx systems
  • are well received
  • can provide occupants with comfortable, clean and
    healthy environment
  • can use a variety of energy sources, which gives
    flexibility for future
  • allow the renewable sources to be used more
  • Human body exergy analyses are a new way of
    proving why LowEx systems are comfortable.

Solutions to problem 2
  • A LowEx component database was created sixty
    data sheets of LowEx components.
  • System solutions are presented (e.g. Sensus,
  • Design guidelines for design of LowEx systems.
  • Case studies provide examples of functional LowEx
  • Now we have collected the components and some
    systems, but more system solutions are needed!

Solutions to problem 3
  • Two pre-design tools for energy and exergy
    analysis of buildings
  • Publication Introduction to Exergy
  • National and international industry seminars
  • LowEx Guidebook and Summary Report

Solutions to problem 4
  • Brochure Low temperature heating systems -
    Increased energy efficiency and improved comfort
  • National and international industry seminars
  • Eight numbers of LowEx Newsletter during the
    working time of Annex 37
  • LowEx Guidebook and Summary Report

Solution to problem 5
  • Human body exergy analysis has now started to
    articulate, why LowEx systems are essential for
    creating rational and comfortable environment.

Human body exergy consumption and thermal comfort
  • Some experienced scientists and engineers say
    that what they can see in this picture is
    consistent with their experiences. Now we are
    able to calculate the optimal combination.

Annex 37 Impacts
  • Founding of LowExNet ? international discussion
    forum for exergy in buildings
  • Start of general interest on and conversation
    about exergy
  • Five doctors on LowEx related subjects in
    different countries during the Annex work
  • Plans for a new Annex

Final Products
  • A CD-ROM containing the Guidebook in an
    interactive mode and .pdf format
  • A Summary Report to introduce the Guidebook
    (containing the CD)
  • Web-site containing the same information as the CD

Design Guidebook for Low Exergy Systems
  • The Annex 37 group considered it very important
    to continue the working together.
  • An international Society for Low Exergy Systems
    in Buildings was founded on September 13th, 2003
    in Kassel, Germany
  • Shortname LowExNet
  • Website www.lowex.net

Ideas for a New Annex
  • The new Annex would deal with
  • economical aspects of exergy exergy of money
  • system optimisation
  • dynamic systems concerning exergy
  • focus more on system applications and their
    detailed analysis
  • More detailed plans during the next meetings of
    the LowExNet

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LowEx component database
  • Data sheets of 63 LowEx components
  • Information box and picture
  • Description
  • Technical risks/benefits analysis
  • Special advantages, disadvantages, limitations or
    side effects

Case examples
Demonstration project Centre for Sustainable
  • Location Kassel, Germany
  • Building type Commercial (office,
    exhibition hall and research hall)
  • Floor area 1000 m²
  • Emission system Floor heating/cooling
  • Heat source District heating
  • Cold source Ground cooling

Thank you for LowExercising with me!
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