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Titolo:
THE HIGH-TEMPERATURE DRYING OF SOFTWOOD BOARDS - A KILN-WIDE MODEL
Autore:
KEEY RB; PANG S;
Indirizzi:
NEW ZEALAND FOREST RES INST LTD,DIV WOOD PROC,PRIVATE BAG 3020 ROTORUA NEW ZEALAND NEW ZEALAND FOREST RES INST LTD,DIV WOOD PROC ROTORUA NEW ZEALAND UNIV CANTERBURY,DEPT CHEM & PROC ENGN CHRISTCHURCH NEW ZEALAND
Titolo Testata:
Chemical engineering research & design
fascicolo: A6, volume: 72, anno: 1994,
pagine: 741 - 753
SICI:
0263-8762(1994)72:A6<741:THDOSB>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIMBER;
Keywords:
HIGH-TEMPERATURE; KILN DRYING; NORMALIZED MOISTURE CONTENT; RELATIVE DRYING RATE; HUMIDITY; STACK OF TIMBER BOARDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
R.B. Keey e S. Pang, "THE HIGH-TEMPERATURE DRYING OF SOFTWOOD BOARDS - A KILN-WIDE MODEL", Chemical engineering research & design, 72(A6), 1994, pp. 741-753

Abstract

Characteristic drying curves are normally determined from laboratory experimental data to specify the drying behaviour in a commercial-scale dryer. By contrast in this paper, we obtain the drying kinetics fromthe numerical results of a more rigorous mathematical model. In our example, we use a model developed for the high-temperature drying of a single softwood board to describe the drying behaviour of a stack of boards in a kiln. Analysis of the mechanism of moisture movement has led us to identify three stages in the drying of a sapwood board and twofor a heartwood board. The drying kinetics can be represented by a dual characteristic curve covering the two falling-rate periods, to yield simplified expressions for the drying kinetics. These expressions can be coupled with mass and energy balances over a control volume to give equations which can be solved numerically to determine the humidity, temperature and moisture-content profiles in the airflow direction within a timber kiln. This two-step modelling procedure provides a computationally efficient way of analysing conditions in any batch dryer.

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Documento generato il 29/11/20 alle ore 06:10:31