Journal of the Geothermal Research Society of Japan
Online ISSN : 1883-5775
Print ISSN : 0388-6735
ISSN-L : 0388-6735
Volume 33, Issue 3
Displaying 1-3 of 3 articles from this issue
Articles
  • Saied JALILINASRABADY, Ryuichi ITOI, Pall VALDIMARSSON, Hikari FUJII, ...
    2011 Volume 33 Issue 3 Pages 113-121
    Published: July 25, 2011
    Released on J-STAGE: February 29, 2012
    JOURNAL FREE ACCESS
    The Sabalan geothermal field in northwest Iran is currently under development. Energy and exergy of waste brine from a designed single flash system were calculated as 54.8 % and 41.4 % of the total available energy and exergy of the produced fluid, respectively. The separated brine could be used as a heat source for a combined power production and district heating system. For a feasibility study of waste heat utilization, a binary plant was selected for power generation in a combined system with the single flash plant. The net power output of the binary plant was calculated to be 17,151 kW. Mathematical models for energy and exergy flows were developed and implemented in Engineering Equation Solver software. The largest exergy destruction for the waste brine occurred at the condenser and evaporator with 12.1 % and 33.4 % of total available exergy destroyed, respectively. The overall exergy and energy efficiencies for the binary plant were 34.4 % and 6.25 %, respectively. A Grassmann diagram of the overall exergy flow illustrates the overall exergy flow of the process. Exergy analysis is a helpful tool for analyzing geothermal plants from the viewpoint of optimum use of produced energy.
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Research Letter
  • Norio YANAGISAWA, Yung NGOTHAI, Peter ROSE, Doone WYBORN
    2011 Volume 33 Issue 3 Pages 125-130
    Published: July 25, 2011
    Released on J-STAGE: February 29, 2012
    JOURNAL FREE ACCESS
    The first circulation test of an Enhanced Geothermal System (EGS) in Australia was conducted from December 2008 to February 2009 at Cooper Basin, South Australia by Geodynamics Limited. The circulation test involved circulating fluid (~14 kg s-1) between an injection well, Habanero #1, and a production well, Habanero #3, for about 66.5 days through a closed-loop system in order to characterize the connection between the wells. During the circulation test, the production fluids for tracer test and geochemical analysis were collected at a sampling panel after a cooling tower near the re-injection well Habanero #1. The tracer ‘breakthrough’ occurred after 4 days and the volume at peak was about 9,000 m3. The tracer-swept pore volume was calculated to be 18,500 m3 and the fraction of tracer returned was 0.78.
    From the results of fluid geochemistry during the circulation test, the average concentration of Na, K and Cl was 5,107 mg/l, 694 mg/l, and 8,885 mg/l, respectively. These values were slightly higher than those of the production well Habanero #3 of the previous open-flow production test. This is considered to be due to the dissolution of feldspars in the granite at reservoir depth.
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  • Takaaki IWAMOTO
    2011 Volume 33 Issue 3 Pages 131-137
    Published: July 25, 2011
    Released on J-STAGE: February 29, 2012
    JOURNAL FREE ACCESS
    One of environmental issues in severe cold and cold areas of China is air pollution in Winter. District heating by coal-fired system has been applied widely in China. These areas in winter are much polluted by CO2, SOx, NOx and soot by coal. Some people wear masks and even black snow falls in some areas. Also there are health problems. We take up the way to use shallow Ground Source as renewal energy and Heat Pump technology (Hereafter, GSHP) from coal fired system on district heating to improve this problem. It is a main discussion in this paper that we demonstrate an applicable possibility of Programmatic CDM as Programme of Activities (Hereafter, PoA) by Kyoto Protocol with GSHP as a new district infrastructure of Changchun. The data of Takasugi et al. (2000) which is GSHP study in Changchun is compared with the applicable criterion on PoA as CDM. As a result, we demonstrate that there is a possibility of applying PoA to a district heating project using GSHP in severe cold area of Changchun.
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