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Publications (10 of 41) Show all publications
Granström, K. & Månsson, B. (2008). Thermic degradation of hardwood during drying as a function of processing parameters. Paper presented at Pellets 2008 - the 3rd World Conference on pellets, Jönköping, Sweden, 27-29 May, 2008. Paper presented at Pellets 2008 - the 3rd World Conference on pellets, Jönköping, Sweden, 27-29 May, 2008.
Open this publication in new window or tab >>Thermic degradation of hardwood during drying as a function of processing parameters
2008 (English)Conference paper, Published paper (Other (popular science, discussion, etc.))
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-24853 (URN)
Conference
Pellets 2008 - the 3rd World Conference on pellets, Jönköping, Sweden, 27-29 May, 2008
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2014-10-29
Granström, K. & Månsson, B. (2008). Volatile organic compounds emitted from hardwood drying as a function of processing parameters. International Journal of Environmental Science and Technology, 5(2), 141-148
Open this publication in new window or tab >>Volatile organic compounds emitted from hardwood drying as a function of processing parameters
2008 (English)In: International Journal of Environmental Science and Technology, ISSN 1735-1472, E-ISSN 1735-2630, Vol. 5, no 2, p. 141-148Article in journal (Refereed) Published
Abstract [en]

During the drying of wood, volatile organic compounds are emitted. These emissions contribute, in the presence of nitrogen oxides and sunlight, to the formation of ground level ozone and other harmful photo-oxidants. Emissions of volatile organic compounds from the drying of birch sawdust in a spouted bed were analyzed with a flame ionization detector by flame ionization detector and with a gas chromatograph-mass pectrometer GC MS. A D-optimal model of the volatile organic compounds emissions showed that the emissions increased exponentially with decreasing sawdust moisture content and that the final sawdust moisture content was influencinge emissions about twice as much as the inlet drying medium temperature and the month of logging. At inlet temperatures of 140-170 °C, the emissions increased steeply when the moisture content of the sawdust reached 10 %, whereas an inlet temperature of 200 °C caused a surge of thermal degradation products at 15 % moisture content. The results of this study should help to reduce the emissions of volatile hydrocarbons during the drying of hardwood sawdust and wood chips

National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-25580 (URN)10.1007/BF03326007 (DOI)
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2017-12-06Bibliographically approved
Månsson, B. & Rehnström, C. (2007). Classification of energy-related problems for LCA methodologya case study based approach. Paper presented at SETAC Europe 14th LCA Case Studies Symposium, Göteborg 3-4 December 2007. Paper presented at SETAC Europe 14th LCA Case Studies Symposium, Göteborg 3-4 December 2007.
Open this publication in new window or tab >>Classification of energy-related problems for LCA methodologya case study based approach
2007 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In the current LCA literature, energy issues are very cursorily treated, if at all. Papers in the area tend to be restricted in scope to specific product categories or specific industries and do not primarily aim at formulating a theoretical foundation for energy in LCA methodology. This paper can be regarded as a contribution to the development of such a foundation. We show how the energy-related problems can be classified into twelve types. Some of these are well-known and adequate solutions exist, some needs further work. Note that we do not claim that it is always necessary to include an energy perspective in LCA, but we do claim that there are certain kinds of contexts or circumstances that make it essential. For the latter cases, a well-defined and scientifically well-founded methodology should be developed. We show here that such a development has to overcome a number of difficult obstacles.

In LCA methods, energy has hitherto been treated so that i) some kinds of energy-related environmental effects have been left out of the analysis; ii) the LCA indices give the wrong signals with regard to energy savings or efficiency improvement potentials. Obviously, the problems caused by such procedures are most severe for energy-intensive industries and in particular for the energy sector.

We discuss two major kinds of dangers with not using a theoretically well-founded energy concept and methodology in an LCA. First, an element of arbitrariness is introduced, so that, e.g., the final value of an LCA index may be manipulated. Second, and for process and product development more severe, the LCA can lead to sub-optimal changes in the products and production processes

Keywords
Energy LCA methodology
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-17695 (URN)
Conference
SETAC Europe 14th LCA Case Studies Symposium, Göteborg 3-4 December 2007
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Månsson, B. (2007). Unresolved issues for the use of an energy numeraire in LCA. Paper presented at SETAC Europe 14th LCA Case Studies Symposium, Göteborg 3-4 dec 2007. Paper presented at SETAC Europe 14th LCA Case Studies Symposium, Göteborg 3-4 dec 2007.
Open this publication in new window or tab >>Unresolved issues for the use of an energy numeraire in LCA
2007 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The methodological framework of LCA has a number of well-known problems and limitations. This has generated a lot of scientific efforts to eliminate or alleviate these. This paper can be seen as one contribution to these efforts, with a particular focus on energy issues in LCA. It has been concluded that a future comprehensive methodological framework for LCA must include a number of principles for comparison and aggregation of different energy forms or of their environmental impacts. In economics, the central concept of value is encapsulated in the term numeraire. This signifies the function of money as a common, universal currency, a measure of value or a unit of account. A numeraire can be used both for comparison and aggregation. A basic requisite for a numeraire is generality. It is here discussed whether it is possible to define an energy numeraire for use in LCA methods, in particular when the LCA is to be used for specific kinds of optimisation. I conclude that the exergy concept needs quite a lot of further theoretical development before it can be included in LCA methodology. Attempts to do so at the present stage would be premature and lead to disappointment and confusion

Keywords
LCA exergy optimisation
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-25230 (URN)
Conference
SETAC Europe 14th LCA Case Studies Symposium, Göteborg 3-4 dec 2007
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2013-01-22
Månsson, B. (2005). Energy Efficiency and Environmental Loads of Drying Systems. Paper presented at Proceedings of the 3rd Nordic Drying Conference, Karlstad, 15-17 June 2005. Paper presented at Proceedings of the 3rd Nordic Drying Conference, Karlstad, 15-17 June 2005. Trondheim
Open this publication in new window or tab >>Energy Efficiency and Environmental Loads of Drying Systems
2005 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Some of the key issues in the area of combined environmental and energy optimization of integrated industrial process systems are discussed, with emphasis on systems that include drying processes. This involves minimization of both energy resource losses and harmful emissions. The risks for environmental sub-optimization in wood drying systems are analyzed on the basis of concrete examples from wood fuel pellet production systems. In particular, the role of terpene emissions is discussed. Important concepts for energy efficiency optimization are discussed. In particular, fundamental problems hindering the use of the exergy concept for systems integration and optimization are described and the possibilities for resolving them are analyzed. The well-known reference state problem is shown to be part of a larger, more intractable problem. In this context, the roles of thermodynamic non-equilibrium and rate constraints are elaborated. It is argued that in order to reach broad applicability of the exergy concept it is necessary to develop a modified concept, which takes into account not only the usual constraints emanating from the three laws of thermodynamics but also other physical as well as technical constraints

Place, publisher, year, edition, pages
Trondheim: , 2005
Keywords
Efficiency, optimization, terpene emissions, exergy, process integration, wood fuel
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-18882 (URN)
Conference
Proceedings of the 3rd Nordic Drying Conference, Karlstad, 15-17 June 2005
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Månsson, B. (2004). Att nyttja det skogen ger. In: Gunilla Almered Olsson, Gabriel Bladh, Bengt Månsson & Lars Nyberg (Ed.), Inte bara träd: hållbart mångbruk av skogslandskapet (pp. 113-120). Stockholm: Carlsson Bokförlag
Open this publication in new window or tab >>Att nyttja det skogen ger
2004 (Swedish)In: Inte bara träd: hållbart mångbruk av skogslandskapet / [ed] Gunilla Almered Olsson, Gabriel Bladh, Bengt Månsson & Lars Nyberg, Stockholm: Carlsson Bokförlag, 2004, p. 113-120Chapter in book (Other academic)
Place, publisher, year, edition, pages
Stockholm: Carlsson Bokförlag, 2004
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-17156 (URN)9172035994 (ISBN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2014-10-07Bibliographically approved
Rehnström, C. & Månsson, B. (2004). Energy Spells Trouble for Life Cycle Assessment.
Open this publication in new window or tab >>Energy Spells Trouble for Life Cycle Assessment
2004 (English)Report (Refereed)
Abstract [en]

For most products and production processes, several quite different forms of energy are involved in different stages in the life cycle. In a recently performed Life Cycle Assessment (LCA) case study, twelve types of energy-related problems for LCA methodology were encountered. We discuss possibilities for resolving these problems and some of the fundamental thermodynamic roots of some of the problems. In this, we also analyse the limitations for the use of the exergy concept in LCA. We also discuss some of the principal difficulties associated with different forms of energy when making use of the results of an LCI or an LCIA in a process development project. We conclude that a large methodology development effort is necessary and that it needs a scientific basis embracing both LCA theory and thermodynamics

Keywords
Energy, Exergy, Life Cycle Assessment
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-18885 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Rehnström, C. & Månsson, B. (2004). Energy Spells Trouble for Life Cycle Assessment.
Open this publication in new window or tab >>Energy Spells Trouble for Life Cycle Assessment
2004 (English)Manuscript (preprint) (Other academic)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-2515 (URN)
Available from: 2009-06-18 Created: 2009-06-18 Last updated: 2011-11-28Bibliographically approved
Almered Olsson, G., Bladh, G., Månsson, B. & Nyberg, L. (Eds.). (2004). Inte bara träd: hållbart mångbruk av skogslandskapet (292ed.). Stockholm: Carlsson Bokförlag
Open this publication in new window or tab >>Inte bara träd: hållbart mångbruk av skogslandskapet
2004 (Swedish)Collection (editor) (Refereed)
Abstract [sv]

Skogslandskapen - hur skall vi värdera dem? Ska de betraktas som rekreationsområden och kulturlandskap eller som arena för konflikter och dragkamp om olika resurser? Är skogsregionerna närande eller tärande? Vilka viktiga samband finns mellan skandinaviska och tropiska landskap?Detta är några av de teman som behandlas i denna spänannde bok om de många dimensionerna och resurserna som ryms i skogslandskapen. Boken ger nya och stimulerande aspekter på framtidsmöjligheterna för en hållbar utveckling för boreala skogslandskap. Den tar också upp det nödvändiga mångbruket av skogens resurser liksom den förändrade synen på människans roll i skogen. Och inte minst behandlas den ekologiska paradoxen att störningar behövs för att bevara skogens ekologiska mångfald.Boken är författad av samhällsvetare, miljöteknologer och ekologer inom den tvärvetenskapliga forskargruppen MiljöFocus vid Karlstads universitet.

Place, publisher, year, edition, pages
Stockholm: Carlsson Bokförlag, 2004 Edition: 292
Keywords
Hållbar utveckling, Mångbruk, Skogslandskap, Ekologisk mångfald Mångvetenskaplig
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-20431 (URN)91-7203-599-4 (ISBN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-10-23Bibliographically approved
Nyberg, L., Almered Olsson, G., Månsson, B. & Bladh, G. (2004). Skogslandskap för hållbar utveckling.
Open this publication in new window or tab >>Skogslandskap för hållbar utveckling
2004 (Swedish)Chapter in book (Other academic)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-23555 (URN)
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2013-01-22
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4814-4321

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