PERFORMANCE OF INDUSTRIAL SOLAR KILN FOR DRYING TIMBER M. N. Haque Forest Research, NZ & T.A.G. Langrish Department of Chemical Engineering, University.

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Presentation transcript:

PERFORMANCE OF INDUSTRIAL SOLAR KILN FOR DRYING TIMBER M. N. Haque Forest Research, NZ & T.A.G. Langrish Department of Chemical Engineering, University of Sydney

Outline  Background to this research  Description of this solar kiln  Materials and methods  Actual measurements & assessment of performance  Comments on suitability in NZ  Conclusions

Solar kilns for drying timber

Solar kiln at Boral Timber’s Herons Creek site, NSW, AUSTRALIA Recent design of solar kiln by Solar Dryers Australia, Bellingen, NSW

Air-drying site

Typical drying example

Materials & methods Boral’s Solar Kiln INPUT OUTPUT SOLAR KILN MODEL Ambient T & RH Timber MC, air T & RH Timber properties Quality prediction

Procedure for measuring MC Biscuit samples: 20  250  43 mm, oven-dry test Kiln sample boards: 300  250  43 mm estimated MC based on biscuit samples

Results- run 1 (May-June)

Results- run 2 (July-August)

Results- run 3 (Sep-Oct)

Results- run 4 (Nov-March)

Results- run 5 (March-May)

Results- summary

Measured solar radiation

Results- HEX status

Image goes here Some NZ facts  About 2 million m 3 timber dried each year (mainly radiata pine)  Average 3 GJ/m 3 energy requirements  Total 6 PJ energy consumption  95% thermal, 5% electrical  60% thermal from wood residue  Processing of alternative species is growing

Solar radiation at Rotorua, NZ (NIWA, 2002)

Image goes here Initiatives in NZ  Greenhouse companies  Redpath:  Harford:  Do not have drying tech experience but an engineering company can be brought together

Conclusions  Solar energy, ambient T & RH, kiln T & RH and wood MC were measured.  Average increases in kiln air T (compared with ambient) were:  17.3  C (May-June)  13.8  C (July-August)  10  C (September-October)  8.2  C (November-March)  7.5  C (March-May)

Conclusions (continued)  Drying times were 3 to 4 months from initial (43 to 62%) to final MC (12 to 22%).  Overall solar kiln is considered as an acceptable alternative to air-drying method for pre-drying of hardwoods (e.g. blackbutt, Eucalyptus pilularis).  So Australasian timber industry is showing an increasing interest in use of solar kilns.

Acknowledgements  Boral Timber Division &  Faculty of Engineering, The University of Sydney for financial assistance