Exergy Conversion Efficiency of Heat Discharged from Factory to Electricity via Dialytic Battery with Concentrated Sea Water

• OHYA Haruhiko

  Department of Material Science and Chemical Engineering, Yokohama National University

• TSUCHIYA Shinsuke

  Department of Material Science and Chemical Engineering, Yokohama National University

• SAWAMOTO Shinjiro

  Mitsubishi Gas Chemical Co., Inc.

• TAKEUCHI Takashi

  Department of Material Science and Chemical Engineering, Yokohama National University

• TAMURA Makio

  Organo Co.

Bibliographic Information

Other Title

• 濃縮海水を用いた透析電池における排熱のエクセルギー変換効率
• ノウシュク カイスイ オ モチイタ トウセキ デンチ ニ オケル ハイネツ ノ エクセルギー ヘンカン コウリツ
• Membrane Conversion Process of Free Energy of Mixing (Part 5)
• 膜法による濃度差エネルギーの電気的エネルギーへの変換 (第5報)

Abstract

The exergy conversion efficiency was calculated in the case where a low level exergy of heat discharged from a factory is converted into a high exergy level of electricity via dialytic battery, and was found to be in the range of 0.494% to 0.797%. Efficiency increases with an increase in feed temperature and in the case of counter-current feed flow configuration. The feed to the dialytic battery is composed of sea water and concentrated sea water, which is concentrated by evaporating water by means of a cooling tower. The heat required is extracted from the warm industrial waste water discharged from factories.<BR>The sea water, whose temperature is raised to 40°C, is fed into an ideal cooling tower and placed in contact with the air (temperature 15°C, humidity 70%, the yearly average values in the Tokyo area). At equilibrium, about 5% of the water being fed to the cooling tower is evaporated and the temperature of the concentrate is lowered to 12°C. The ideal cooling tower number is found to be 47 for concentrating the sea water to a saturated state (26.4 wt% salt).<BR>The dialytic battery is composed of 1000 paired anion exchange membranes and cation (area resistivity 2Ω·cm² for each) and a maximum output of 43.3 kW was calculated at the following operating condition; 40°C, saturated sea water (5415 mol/m³), fresh sea water (598 mol/m³), average feed velocity 0.01 m/s.<BR>Assuming that 10% of one million yen/kW as the initial investment for this system is allocated to the membrane, the cost of the membrane might be 50 yen/m² in the case of 1 W/(m²·pair), and 150 yen/m² in the case of 3 W/(m²·pair).

Journal

• Bulletin of the Society of Sea Water Science, Japan

  Bulletin of the Society of Sea Water Science, Japan 54 (2), 136-145, 2000

  The Society of Sea Water Science, Japan

Details

• CRID: 1390282680429592704
• NII Article ID: 10008275782
• NII Book ID: AN0018645X
• DOI: 10.11457/swsj1965.54.136
• NDL BIB ID: 5334547
• ISSN: 03694550
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5334547
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed