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Bengtsson, P., Berghel, J. & Renström, R. (2015). A household dishwasher heated by a heat pump system using an energy storage unit with water as the heat source. International journal of refrigeration, 49, 19-27
Open this publication in new window or tab >>A household dishwasher heated by a heat pump system using an energy storage unit with water as the heat source
2015 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 49, p. 19-27Article in journal (Refereed) Published
Abstract [en]

Electricity usage by a household dishwasher can be reduced by using a heat pump system to heat the dishwasher cabinet, dishware and washing water. The evaporator obtains the energy from an energy storage unit which consists of a container filled with water which freezes to ice. The majority of the heat transfer from the energy storage to the evaporator occurs when ice is created in the energy storage unit. A transient simulation model of a dishwasher with a heat pump system was developed and compared to an experimental setup with good agreement. A simulation study of the compressor cylinder volume and the compressor operating time was performed. The results showed a 24% reduction in total electricity use compared to a dishwasher cycle using a traditional electric element.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Appliances, Energy use, Heat transfer, Freezing, Transient simulation, Appareils domestiques, Utilisation d'énergie, Transfert de chaleur, Congélation, Simulation transitoire
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-39072 (URN)10.1016/j.ijrefrig.2014.10.012 (DOI)000348012500004 ()
Funder
Knowledge Foundation
Available from: 2016-01-19 Created: 2016-01-19 Last updated: 2017-11-30Bibliographically approved
Berghel, J. & Renström, R. (2014). An Experimental Study on the Influence of Using a Draft Tube in a Continuous Spouted Bed Dryer. Drying Technology, 32(5), 519-527
Open this publication in new window or tab >>An Experimental Study on the Influence of Using a Draft Tube in a Continuous Spouted Bed Dryer
2014 (English)In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 32, no 5, p. 519-527Article in journal (Refereed) Published
Abstract [en]

Further increasing the production of processed biofuel also increases the demands on drying capacity. With the aim of increasing the heat capacity flow, experimental tests have been performed on the process of drying sawdust in a continuous spouted bed dryer with nine different draft tube designs. The results showed that a draft tube with an increased length and an increased disengagement height decreased the dry substances' flow rate throughout the dryer. The results also showed that the mass of the material in the dryer was approximately the same in all the tests. This means that the draft tubes, no matter their size, do not influence the amount of material in the dryer.

Place, publisher, year, edition, pages
Taylor & Francis, 2014
Keywords
Sawdust, Superheated steam, Spouted bed dryer
National Category
Climate Research
Identifiers
urn:nbn:se:kau:diva-41535 (URN)10.1080/07373937.2013.840648 (DOI)000333995000004 ()
Available from: 2016-04-25 Created: 2016-04-11 Last updated: 2017-11-30Bibliographically approved
Renström, R. & Berghel, J. (2014). Experimental results from drying sawdust below the fiber saturation point using a vertical pneumatic dryer. In: IDS 2014, The 19th International Drying Symposium: . Paper presented at IDS 2014, The 19th International Drying Symposium 24-27 Augusti, Lyon Frankrike. Lyon, France
Open this publication in new window or tab >>Experimental results from drying sawdust below the fiber saturation point using a vertical pneumatic dryer
2014 (English)In: IDS 2014, The 19th International Drying Symposium, Lyon, France, 2014Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Lyon, France: , 2014
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-34914 (URN)
Conference
IDS 2014, The 19th International Drying Symposium 24-27 Augusti, Lyon Frankrike
Available from: 2015-01-15 Created: 2015-01-15 Last updated: 2016-05-25Bibliographically approved
Bengtsson, P., Berghel, J. & Renström, R. (2014). Performance Study of a Closed-Type Heat Pump Tumble Dryer Using A Simulation Model and an Experimental Set-Up. Drying Technology, 32(8), 891-901
Open this publication in new window or tab >>Performance Study of a Closed-Type Heat Pump Tumble Dryer Using A Simulation Model and an Experimental Set-Up
2014 (English)In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 32, no 8, p. 891-901Article in journal (Refereed) Published
Abstract [en]

In the interests of competitiveness, manufactures of tumble dryers are seeking to reduce both their electricity use and the drying time. This study examines how the cylinder volume of the compressor and the total heat transfer of the condenser influence the drying time and electricity use in a heat pump tumble dryer. A transient simulation model was developed and compared to an experimental set-up with good similarity. The simulations show that increasing the cylinder volume of the compressor by 50% decreases the drying time by 14% without using more electricity.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2014
Keywords
Energy analysis; Heat and mass transfer; Heat pump drying; Mathematical modeling
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-33839 (URN)10.1080/07373937.2013.875035 (DOI)000337247400004 ()
Available from: 2014-09-26 Created: 2014-09-26 Last updated: 2017-12-06Bibliographically approved
Berghel, J. & Renström, R. (2014). Superheated steam drying of sawdust in continuous feed spouted beds: a design perspective. Biomass and Bioenergy, 71(0), 228-234
Open this publication in new window or tab >>Superheated steam drying of sawdust in continuous feed spouted beds: a design perspective
2014 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 71, no 0, p. 228-234Article in journal (Refereed) Published
Abstract [en]

Spouted bed drying technology shows promising results for the drying of unscreened sawdust in superheated steam. In this paper, the experiences from designing, running and evaluating two spouted bed continuous feed dryers are presented. Stable running conditions and drying results have been achieved. This has been particularly important for sawdust that will be compressed into pellets or briquettes. The spouted bed superheated steam dryer also shows high potential for energy efficient integration into sawmills. Our recommendation is thus, to use the outlet steam temperature as the control parameter for the outlet moisture content. A drying rate above and one below the fibre saturation level, can be identified. Visual observations through the viewing glass in the drying zone in both the dryers clearly showed that not all of the material participated in the spout at all times; there were, however, no indications of dead zones. A heat transfer analysis indicated that only about 70% of the surface area of the material was in thermal contact with the steam. This paper sums up the experiences regarding drying properties, control and system properties obtained when sawdust is dried using superheated steam as the drying medium. Further work on standardised dryers in series or in parallel is necessary to increase the capacity in the spouted bed dryer.

Keywords
Sawdust, Drying, Spouted bed, Sawmills, Superheated steam
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-34915 (URN)10.1016/j.biombioe.2014.10.004 (DOI)000345349500022 ()
Available from: 2015-01-15 Created: 2015-01-15 Last updated: 2017-12-05Bibliographically approved
Gustavsson, C., Nilsson, L. & Renström, R. (2014). Syngas as an Additional Energy Carrier in the Pulp and Paper Industry: A Mill-Wide System Analysis of a Combined Drying Concept, Utilizing On-Site Generated Gas and Steam. Energy & Fuels, 28(9), 5841-5848
Open this publication in new window or tab >>Syngas as an Additional Energy Carrier in the Pulp and Paper Industry: A Mill-Wide System Analysis of a Combined Drying Concept, Utilizing On-Site Generated Gas and Steam
2014 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 28, no 9, p. 5841-5848Article in journal (Refereed) Published
Abstract [en]

Large amounts of thermal energy are required for different unit operations in the pulp and paper industry. Typically, this energy is distributed by means of steam. In this study, introduction of in-situ-generated syngas as an energy carrier in parallel to the predominant steam has been investigated. The examined systems use dual fluidized-bed gasification integrated with a solid fuel boiler of a paper mill together with impingement drying in combination with cylinder drying, a concept enabling higher specific drying rates. The studied systems exhibit reduced overall energy use when compared to the present situation with conventional steam-heated cylinder drying. Cold tar cleaning by condensation/absorption and firing of the syngas in a gas turbine followed by utilization of the exhaust gases for drying are interesting options because this results in reduced biomass consumption with maintained power production.

Place, publisher, year, edition, pages
Washington, DC, USA: American Chemical Society (ACS), 2014
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-33956 (URN)10.1021/ef5010144 (DOI)000342118200030 ()
Funder
Knowledge Foundation
Available from: 2014-10-02 Created: 2014-10-02 Last updated: 2017-12-07Bibliographically approved
Ståhl, M., Berghel, J., Frodeson, S. & Renström, R. (2013). Energy reduction in wood-fuel pellet production. Forest bioenergy review, 4(19), 6
Open this publication in new window or tab >>Energy reduction in wood-fuel pellet production
2013 (English)In: Forest bioenergy review, ISSN 2045-8614, Vol. 4, no 19, p. 6-Article in journal (Other academic) Published
Place, publisher, year, edition, pages
UK: K V J Enterprises, 2013
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-34916 (URN)
Available from: 2015-01-15 Created: 2015-01-15 Last updated: 2018-04-16Bibliographically approved
Frodeson, S., Berghel, J. & Renström, R. (2013). Pneumatic dryer as a second step in a two step drying technique. In: Sixth Nordic Drying Conference NDC 2013: . Paper presented at Sixth Nordic Drying Conference (NDC) 5-7 juni 2013 Copenhagen, Danmark.
Open this publication in new window or tab >>Pneumatic dryer as a second step in a two step drying technique
2013 (English)In: Sixth Nordic Drying Conference NDC 2013, 2013Conference paper, Published paper (Refereed)
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-29711 (URN)
Conference
Sixth Nordic Drying Conference (NDC) 5-7 juni 2013 Copenhagen, Danmark
Available from: 2013-10-18 Created: 2013-10-18 Last updated: 2018-04-16Bibliographically approved
Berghel, J. & Renström, R. (2013). Shi yong dao liu guan dui lian xu pen dong gan zao qi de ying xiang: (Effects of using draft tubes in a continued spouted bed). Drying Technology & Equipment, 1727-3080(3), 9-18
Open this publication in new window or tab >>Shi yong dao liu guan dui lian xu pen dong gan zao qi de ying xiang: (Effects of using draft tubes in a continued spouted bed)
2013 (Chinese)In: Drying Technology & Equipment, ISSN 1727-3080, Vol. 1727-3080, no 3, p. 9-18Article in journal (Refereed) Published
National Category
Engineering and Technology Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-33838 (URN)
Available from: 2014-09-26 Created: 2014-09-26 Last updated: 2017-12-06Bibliographically approved
Renström, R., Berghel, J., Frodeson, S., Granström, K., Nilsson, L., Lestelius, M., . . . Stawreberg, L. (2013). The drying process from a product perspective. In: : . Paper presented at Nordic Drying Conference - NDC, Copenhagen, Danmark 5-7 juni 2013.
Open this publication in new window or tab >>The drying process from a product perspective
Show others...
2013 (English)Conference paper, Published paper (Refereed)
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kau:diva-29707 (URN)
Conference
Nordic Drying Conference - NDC, Copenhagen, Danmark 5-7 juni 2013
Available from: 2013-10-21 Created: 2013-10-18 Last updated: 2018-04-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5764-7062

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