Location Identification and Capacity Determination of Ocean Thermal Energy Conversion Power Plants in Sri Lanka

Abstract

In many parts of the world, renewable energy-based power plants are gradually replacing fossil fuel-based power plants. Intermittency is a major issue for most of the renewable power plants. But Ocean Thermal Energy conversion plants (OTEC) can generate electricity throughout the day. Such plants are possible in tropical countries where the temperature difference between the surface and the depth of the water is sufficient for electricity generation. In this research, a pre-feasibility study of OTEC plants was carried out. The paper discussed the main requirements for OTEC plant location, different types of plants and their suitability, operation, and key advantages of existing plants especially in the South Asian region. Temperature versus sea depth  and the distance from the seashore to the plant location were considered in identification of the suitable locations of the plant. Based on the criteria, three sites were identified as the most feasible locations for OTEC plants in the country: Pasikudha, Trincomalee, and Dondara.  Plant capacity at each location has been calculated considering the enthalpy diagram. Plant capacity of each location has been presented as a trend line equation considering the power generated by the plant and the auxiliary power of the plant. The results of the study revealed that maximum possible power output of all the three plants is limited up-to 6 MW.