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Energy Efficient Textile Drying
Karlstad University, Faculty of Technology and Science.
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Traditionally, textiles were dried outdoors with the wind and the sun enhancing the drying process. Tumble dryers offer a fast and convenient way of drying textiles independent of weather conditions. Tumble dryers, however, consume large amounts of electrical energy. Over 4 million tumble dryers are sold each year in Europe and a considerable amount of energy is used for drying of clothes. Increasing energy costs and the awareness about environmental problems related to a large energy use has increased the demand for dryers with better energy efficiency. The aim with this thesis is to show how to improve the energy efficiency of domestic tumble dryers.

Two types of tumble dryers are available on the market today: the open cycle dryer and the closed cycle dryer. In the open cycle dryer room air is heated and led into the drying drum. The exhaust air leaves the dryer and is often evacuated outside the building. In the closed cycle dryer an internal airflow is recirculated inside the dryer. When the hot air has passed through the drying drum it is led through a heat exchanger where the water vapour is condensed before the air is heated again and led to the drum. The heat exchanger is cooled with room air.

Drying at low temperature has been shown to reduce the specific energy use for an open cycle tumble dryer. In Paper I a correlation between the specific energy use, the drying time and the heat supply was established for a specific load by using the exhaust air temperature. It was shown that the total drying time and specific energy use could be predicted from data during the first hour of the process. This result indicated a possibility to create a control system that makes it possible for the user to choose between low energy use or short drying time.

The focus of Paper II is to reduce the energy use for a closed cycle tumble dryer. Energy and mass balances were established in order to determine feasible improvements. Energy and mass flows in the dryer indicated that reducing leakage from the internal system of the dryer gave the largest reduction of specific energy use. Insulation of the back cover of the dryer and opening the internal system during the falling drying rate period also gave positive results on the energy use. In total a feasible reduction of the energy use of approximately 17% was calculated.

Place, publisher, year, edition, pages
Fakulteten för teknik- och naturvetenskap , 2006.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2006:61
Keywords [en]
tumble dryer, drying, textile, energy and mass balance, control strategy
National Category
Mechanical Engineering
Research subject
Environmental and Energy Systems
Identifiers
URN: urn:nbn:se:kau:diva-729ISBN: 91-7063-092-5 (print)OAI: oai:DiVA.org:kau-729DiVA, id: diva2:6429
Presentation
2006-12-18, Sjöströmsalen, 1B 309, Karlstads Universitet, Karlstad, 10:15
Opponent
Supervisors
Available from: 2007-03-13 Created: 2007-03-13
List of papers
1. Temperature as an Indicator of Moisture Content and Drying Rate - a Control Strategy for an Air Vented Tumble Dryer
Open this publication in new window or tab >>Temperature as an Indicator of Moisture Content and Drying Rate - a Control Strategy for an Air Vented Tumble Dryer
2006 (English)In: Proceedings of the 15th International Drying Symposium: Vol. B, 2006, Vol. Vol. B, p. 761-764Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:kau:diva-2085 (URN)963 84 8359-1 (ISBN)
Available from: 2007-03-13 Created: 2007-03-13 Last updated: 2010-05-21Bibliographically approved
2. Reducing the Energy Use for Textiles in a Closed Cycle Tumble Dryer
Open this publication in new window or tab >>Reducing the Energy Use for Textiles in a Closed Cycle Tumble Dryer
2006 (English)Manuscript (preprint) (Other academic)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-2086 (URN)
Available from: 2007-03-13 Created: 2007-03-13 Last updated: 2011-11-10Bibliographically approved

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