@article{oai:nagasaki-u.repo.nii.ac.jp:00022998,
 author = {吉田, 孝男 and 栗須, 正登 and 河部, 秀彦 and 児玉, 好雄},
 issue = {4},
 journal = {日本地熱学会誌},
 month = {},
 note = {The performance characteristics of an evaporator system with spring steam and a direct-contacttype condenser system for energy conversion of hot springs are described in this report. The newly devised evaporator system is composed by a spring steam separator, a hot water tank, a heat exchanger remaked of the shell-and-tube V-type, and a lubricant separator tube. The spring steam, which is separated from spring hot water by the spring steam separator, is blown up in the form of bubbles in the hot water through the bubble-making plate placed under the Uvtype tubes. These steam bubbles enhance turbulent flows around the If-type tubes, incresing the heat transfer rate. Therefore, the pump of hot water could be omitted in the present system. The working medium heated in the U'-type tubes is first led into the lubricant separator, where it is separated from the lubricant, and then goes into the flusher. In the flusher, the necessary amount of working medium for electric power generation is evaporated, and its gas is fed into the screw expander. The rest liquid of the working medium is returned to the Ll-type tubes by the pump and is reheated with the hot water. The lubricant separated by the lubricant separator, and then moves to the screw expander because of its own high pressure, therefore the pump of the lubricant could be omitted in this system. In the present test, evaporator system is composed of bare copper tubes (25.44> x 2t x effective length 60 m) and the overall heat transfer coefficients with the from R11 are about 1.0 kW/m2K. Secondly, the newly devised condenser system is similary built by modifying the usual mass-produced shelland- tube U-type heat exchanger. The working medium liquid filling the tube chamber is chilled by the cooling water which flows in the tubes. The working medium gas from the screw expander is blown up into the working medium liquid through the perforated metal plate with (408 x 4Φ bubble holes) which is placed under the working medium liquid. The blown working medium gas bubbles are condensed efficiently through the direct-contact heat exchange. From the experiments of the new condenser system with R11, we obtained the value of 2.5 kW/m2K for the overall heat transfer coefficients of this condensor system with bare copper tubes (25.4Φ x 2t x effective length 85 m)., 日本地熱学会誌 12(4), 327-345;1990},
 pages = {327--345},
 title = {小型温泉熱発電用蒸発器および直接接触型凝縮器の特性},
 volume = {12},
 year = {1990}
}