HIROSE Koichi Iwata Univ., Dept.of Mech.Eng., Associate prof., 工学部機械工学科, 助教授 (80156710)
MIZUNO Ituo T.N.C.M.T., Erectronic Mech.Eng., Associate prof., 電子機械工学科, 助教授 (30124051)
|Budget Amount *help
¥2,300,000 (Direct Cost : ¥2,300,000)
Fiscal Year 1997 : ¥200,000 (Direct Cost : ¥200,000)
Fiscal Year 1996 : ¥900,000 (Direct Cost : ¥900,000)
Fiscal Year 1995 : ¥1,200,000 (Direct Cost : ¥1,200,000)
An experimental and analytical investigation has been carried out on heat extraction from artificial cracks in the subsurface hot dry rock.
This study aims at presenting useful basic data for determing the size of fracture and the amount of heat extraction from hot dry rock.
Experiment was carried out in constant heat flux condition using a horizontal parallel plate channel kept in contact with hot granite plate. Supplied heat, water flow rate, and granite thickness are changed. The main conclusions are : (1) Temperature distribution on the granite surface depends on three factors-granite temperature, granite thickness, and water flow rate. The last factor is most effective. (2) Thermal conductivity of granite is effected largely by its temperature. (3) Distribution of local coefficient of heat transfer is depicted. Effects of granite temperature, granite thickness, and water flow rate are considered. (4) From the characteristic curve obatained by average coefficient of heat transfer and
temperature difference, it is founnd that average coefficient of heat transfer decreases as temperature difference increases.
Numerical analysis was carried out to the same size model as experimental appratus under some simplifying assumptions.
The main conclusions are : (1) Temperature distribution on solid-liquid interface obtained by numerical solution agrees with experimental result in adequate order. (2) Temperature distribution which is mentiomed above is strongly effected by granite temperature and water flow rate. It decrases as granite temperature and water flow rate increases. (3) As for heat flow rate, good agreement between experiment and numerical solution makes calculation possible.