JPEE  Vol.2 No.10 , October 2014
Performance Assessment of a Shell Tube Evaporator for a Model Organic Rankine Cycle for Use in Geothermal Power Plant
Abstract: The global energy demand increases with development and population rise. Most electrical power is currently generated by conventional methods from fossil fuels. Despite the high energy demand, the conventional energy resources such as fossil fuels have been declining and harmful combustion byproducts are causing global warming. The Organic Rankine Cycle power plant is a very effective option for utilization of low grade heat sources for power generation. In the Organic Rankine Cycle heat exchangers such as evaporators and condensers are key components that determine its performance. Researches indicated that shell tube heat exchangers are effectively utilized in this cycle. The design of the heat exchanger involves establishing the right flow pattern of the interacting fluids. The performance of these exchangers can be optimized by inserting baffles in the shell to direct the flow of fluid across the tubes on shell side. In this work heat exchangers have been developed to improve heat recovery from geothermal brine for additional power generation. The design involved sizing of heat exchanger (evaporator) using the LMTD method based on an expected heat transfer rate. The heat exchanger of the model power plant was tested in which hot water simulated brine. The results indicated that the heat exchanger is thermally suitable for the evaporator of the model power plant.
Cite this paper: Nigusse, H. , Ndiritu, H. and Kiplimo, R. (2014) Performance Assessment of a Shell Tube Evaporator for a Model Organic Rankine Cycle for Use in Geothermal Power Plant. Journal of Power and Energy Engineering, 2, 9-18. doi: 10.4236/jpee.2014.210002.

[1]   Mburu, M. (2009) Geothermal Energy Utilization. Exploration for Geothermal Resources.

[2]   (2013) 2013 Geothermal Power: International Market Overview.

[3]   Teguh, P.B., et al. (2011) Design of n-Butane Radial Inflow Turbine for 100 kW Binary Cycle Power Plant. International Journal of Engineering & Technology, 11, 55.

[4]   Hadidi, A., Hadidi, M. and Nazari, A. (2013) A New Design Approach for Shell-and-Tube Heat Exchangers Using Imperialist Competitive Algorithm (ICA) from Economic Point of View. Energy Conversion and Management, 67, 66-74.

[5]   Sairam, V., Siddarath, B., Saiprasad, C., Taruns, S. and Sujit, G. (2014) Design, Fabrication and Testing of FRP Shell Counter-Flow Heat Exchanger. International Journal of Engineering Science and Innovative Technology, 3, 171-176.

[6]   Shah, R.K. and Sekulic, D.P. (2012) Fundamentals of Heat Exchanger Design. University of Kentucky, Lexington.

[7]   Hettiarachchi, H.D.M., et al. (2007) Optimum Design Criteria for an Organic Rankine Cycle Using Low-Temperature Geothermal Heat Sources. Energy, 32, 1698-1706.

[8]   Teguh, P.B. and Trisno, M.D. (2011) Model of Binary Cycle Power Plant Using Brine as Thermal Energy Sources and Development Potential in Sibayak. International Journal of Electrical & Computer Sciences, 11, 45.

[9]   Kuppan, T. (2000) Heat Exchanger Design Handbook. Marcel Dekker, Inc., New York.

[10]   Incropera, F.P. and Dewitt, D.P. (2006) Introduction to Heat Transfer. New York.

[11]   Thundil, R. (2012) Shell Side Numerical Analysis of a Shell and Tube Heat Exchanger Considering the Effects of Baffle Inclination Angle on Fluid Flow. International Journal of Thermal Science, 16, 1165-1174.

[12]   Singh, A. and Sehgal, S.S. (2013) Thermohydraulic Analysis of Shell-and-Tube Heat Exchanger with Segmental Baffles. ISRN Chemical Engineering, 2013, Article ID: 548676.

[13]   Kumar, U., Karimi, M.N. and Agrawal, B.K. (2013) Optimization and Selection of Organic Rakine Cycle for Low Grade Heat Recovery by Using Graph Theoretical Approach. International Journal of Sustainable Development and Green Economics, 2, 11-16.

[14]   Pandey, A. (2011) Performance Analysis of a Compact Heat Exchanger. Master’s Thesis, National Institute of Technology Rourkela, Rourkela.

[15]   NIST Chemistry WebBook.

[16]   Patel, S.K. and Mavani, A.M. (2012) Shell and Tube Heat Exchanger Thermal Design with Optimization of Mass Flow Rate and Baffle Spacing. International Journal of Advanced Engineering Research and Studies, 2, 130-135.