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450 H. Jung, J. Hwang / Energy 75 (2014) 443e452 Table 11 Calculation of the power for cold sea water pump. Sea/WSP WSP/SC Suction diameter 42 40 Discharge diameter 40 40 Height14 CT Typically 50 176.5 SC/DC Unit 40 inch 40 inch em 64þ16 m 8.02 kPa 28.3 kW Length 162 þ 32 Dp 31.59 W 111.5 64 þ 16 48.67 171.7 WSP: water storage pond, SC: secondary condenser, CT: condenser tubes, DC: discharge. The circulating sea water flow rate decreases with an increase in the quantity of the steam used. The pumping power can also be decreased as a result. Approximately 2 m3/s of cold sea water, with a nominal tem- perature difference of 20 C, are required per MW of exportable or net electricity [29]. For a 1.5 MW C-OTEC system, approximately 3 m3/s of cold sea water will be needed. Required power for this case can be calculated based on the geographical data of the Yeongdong thermal power plant as shown in Table 11. Total required power is calculated as Ppmp, csw 1⁄4 488.0 kW, which is about 32.5% of the gross power. 3.3.3. Re-use of the secondary condenser discharge The discharge side of the secondary condenser can be main- tained at low temperature (7 Ce10 C) even after circulating. This temperature is still lower than the temperature of intake side of the primary condenser in summer. We expected improved condenser performance when re-using the condenser outgoing circulating water to cool the primary condenser. The concept of re of the circulating sea water is shown in Fig. 5. The concept is one in which the discharge line of the circulating water from the sec- ondary condenser is mixed with the intake of the primary condenser. The performance variations of the condenser vacuum and cycle efficiency are depicted in Figs. 6 and 7, respectively for re- use and once-through cases. In this case, the condenser pres- sure decreases to 6.76 kPa in once-through case, while it falls to 4.0 kPa upon the re-use of the condenser discharge. In case of direct injection, the condenser pressure decreases to 3.10 kPa. The cycle efficiency increases to 42.6% in the re-use case, whereas it Fig. 6. Comparison of the condenser pressure depending on the cooling concept. Fig. 7. Comparison of the plant efficiency depending on the cooling concept. increases to 41.1% in the once-through cooling case. In case of direct injection, efficiency reaches up to 43.0%. A steam usage rate of 20% is sufficient to maintain the design condition of the condenser and compensate for the loss of power during the summer season. Fig. 5. Re-use of the secondary condenser discharge.PDF Image | Feasibility study of a combined Ocean Thermal Energy Conversion method in South Korea
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