# Performance evaluation of sea water heat exchanger installed in the submerged bottom-structure of floating architecture

• Sim, Young-Hoon (Department of Energy Plant Engineering, Graduate School, Korea Maritime and Ocean University) ;
• Hwang, Kwang-Il (Division of Mechanical Engineering, Korea Maritime and Ocean University)
• Accepted : 2015.12.17
• Published : 2015.12.31

#### Abstract

Floating architecture is a type of building that is geographically located on a sea or a river. It floats under the influence of buoyancy, and does not have an engine for moving it. Korea is a peninsula surrounded by sea except on the north side, so floating architectures have been mainly focused on two points: solving the issue of small territory and providing various leisure & cultural spaces. Floating architectures are expected to save energy effectively, if they use sea water heat, which is known to be clean energy with infinite reserves. To use sea water heat as the heat source and/or heat sink, this study proposes a model in which a sea water heat exchanger is embedded in the concrete structure in the lower part of the floating architecture that is submerged under the sea. Based on the results of performance evaluations of the sea water heat exchanger using CFD (computational fluid dynamics) analysis and mock-up experiments under various conditions, it is found out that the temperature difference between the inlet and outlet of the heat exchanger is in the range of $3.06{\sim}9.57^{\circ}C$, and that the quantity of heat transfer measured is in the range of 3,812~7,180 W. The CFD evaluation results shows a difference of 5% with respect to the results of mock-up experiment.

#### Acknowledgement

Supported by : Ministry of Land, Transport and Maritime Affairs

#### References

1. C. H. Moon, "Sailing of research group on floating architecture," Journal of the Architectural Institute of Korea, vol. 55, no. 09, pp. 14-19, 2011 (in Korean).
2. H. S. Lee, C. H. Moon, and Y. H. Kang, "An analysis of market situation and industry trend in floating architecture," Proceedings of the Korean Institute of Navigation and Port Research Conference, pp. 141-144, 2009 (in Korean).
3. B. Kim, C. H. Lee, J. H. Koo, and K. I. Hwang, " Performance evaluation of types of sea water heat exchanger for floating architecture," Proceedings of the Korean Institute of Navigation and Port Research Conference, pp. 287-288, 2013 (in Korean).
4. K. I. Hwang and Y. H. Sim, "CFD analysis on performance evaluation of sea water heat exchanger in floating architecture," Proceedings of the Korean Society of Marine Engineering, pp. 211, 2014 (in Korean).
5. K. C. Kim and S. Lee, "A new method to convert into seawater heat for the indoor air-conditioning resource," Journal of the Korean Society of Marine Engineering, vol. 29, no. 08, pp. 883-890, 2005 (in Korean).
6. K. C. Kim, A Study on Heat Gain from Seawater for Cooling of Buildings, Ph.D. Dissertation, Department of Architectural Engineering, Dong-Eui University, Korea, 2006 (in Korean).
7. H. J. Kim, H. S. Lee, J. I. Yoon, C. H. Son, and Y, K. Jung, "A numerical study on heat transfer and pressure drop of plate heat exchanger using at seawater air conditioning with the variation of channel spaces," Journal of the Korean Society of Marine Engineering, vol. 38, no. 06, pp. 704-709, 2014 (in Korean). https://doi.org/10.5916/jkosme.2014.38.6.704
8. Y. W. Lee, Y. Y. Kim, and S. K, Song, "Recent floating buildings and design methods," Journal of the Wind Engineering Institute of Korea, vol. 16, no. 04, pp. 79-87, 2012 (in Korean).
9. J. Yang and W. Liu, "Numerical investigation on a novel shell-and-tube heat exchanger with plate baffles and experimental validation," Journal of the Energy Conversion and Management, vol. 101, pp. 689-696, 2015. https://doi.org/10.1016/j.enconman.2015.05.066
10. A. N. Asadolahi, R. Gupta, S. S. Y. Leung, D. F. Fletcher, and B. S. Haynes, "Validation of a CFD model of taylor flow hydrodynamics and heat transfer," Journal of the Chemical Engineering Science, vol. 69, no. 1, pp. 541-552, 2012. https://doi.org/10.1016/j.ces.2011.11.017
11. L. Zhao and J. K. Yoon, "A study on heat transfer and pressure drop characteristics of plain fin-tube heat exchanger using CFD analysis," Journal of the Korean Society of Marine Engineering, vol. 38, no. 06, pp. 615-624, 2014 (in Korean). https://doi.org/10.5916/jkosme.2014.38.6.615
12. R. R. Hou, H. S. Park, J. K. Yoon, and J. H. Lim, "Numerical analysis for heat transfer and pressure drop characteristics of "Shell-tube" heat exchanger with various baffle factor," Journal of the Korean Society of Marine Engineering, vol. 38, no. 04, pp. 367-375, 2014 (in Korean). https://doi.org/10.5916/jkosme.2014.38.4.367
13. S. H. Kwag, "Numerical analysis of turbulent flows in the helically coiled pipes of heat transfer," Journal of the Korean Society of Marine Engineering, vol. 37, no. 08, pp. 905-910, 2013 (in Korean). https://doi.org/10.5916/jkosme.2013.37.8.905
14. F. Incropera and D. Dewitt, Introduction to Heat Transfer, 4th ed., Wiley, 2001.
15. Yokogawa Electric Corporation, MX100/MW100 Data Acquisition Unit Installation and Connection Guide, 2005.
16. Daum, http://map.daum.net, Accessed July 15, 2015.