**7. References**


produce high quality materials with less moisture distribution and less exude of resin than former (Kanayama, K., et al., Nov., 2010), (Koga, S., et al., Oct. 2008). Moreover, HFPRI is examining now how to dry not only lamina lumber but also large square sectional lumber with high quality as short as possible utilizing solar radiation only, without any auxiliary

First, the optical and the thermal mechanism of volumetric S. R. collection incident upon an opaque house covered by a composite surface were explained. Second, on a "South-North model" and a "East-West model" of the opaque house, under new concept of volumetric solar heat collection, the working performance of the opaque house was calculated applying S. R. database at the proving test site. As a result, one of the performance factors, ηVC of both houses, which was defined as efficiency of volumetric solar heat collection, attained 140 % of averaged value through the year. The rate of solar heat collected was 1.4 times of S. R. incident on the floor of the opaque house. Thirdly, applying a normal calculation method, using S. R. measured at the proving test site; Ashoro, a volumetric solar heat collected QVC of the opaque house constructed on the site was calculated, the proving test on larch lumber drying was carried out in cooperation with all staffs, and drying performance was verified to be good. Where, an electric power was supplied to feed pumps for auxiliary heat and fans to agitate inside air in the opaque house was 400 W maximum which was negligibly small. Thus, a "fully passive-type solar lumber drying house" proposed by us, could be achieved to dry out larch lumber under the conditions of low temperature and low humidity inside the

This developing research is a part of the result of Project of "New Technology System Development Utilizing Solar Energy", by New Energy and Industrial Technology Department Organization (NEDO). On behalf of the authors, I would like to appreciate all the financial support, and at the same time, I would like to say thanks a lot to all staffs of the

Baba, H., Kanayama, K., (July,1985) Studies of Measuring and Estimating of Solar Radiation (2nd Report), *Trans. JSME, B,* Vol.51, No.467, pp. 2451-2456, Tokyo, Japan. Baba, H., Kanayama, K., Koga, S., Sugawara, T., (Oct.,2008) Development on a Fully Passive

Baba, H., Kanayama, K., Koga, S., Sugawara, T. , (Jun.,2009) Performance Analysis and

Kanayama, K., Baba, H., (May, 2004) *Utilizing Technology of Solar Energy,* Morikita-Pubisher

Ltd, Co., pp.212-214, ISBN 4 -627-94661-9, Tokyo, Japan.

Solar Lumber Dying Apparatus (Part 2), *Journal of JSES*, Vol.34, No.5, pp. 57-64,

Proving Test on a Solar Lumber Drying House Covered by a composite Surface, *Proceedings of 46th NHTS of Japan*, pp.505-506, Kyoto, Japan, (CD-ROM) ISSN 1346-

heat. Good result is expected.

**5. Conclusions** 

opaque house.

**7. References** 

**6. Acknowledgements** 

University, the Institute and the Company collaborated.

ISSN0388-9564,Tokyo, Japan.

1532, G222.


Yamada, M., (May, 1998) "International Corroboration Research on Solar Energy Utilizing System (Indonesia)", *ENAA Report*, *Engineering No.79,* pp.16-19, Tokyo, Japan.
