PDF Publication Title:
Text from PDF Page: 005
hth 1⁄4 Wnet (16) Qeva Finally, the objective parameter that represents the ratio of net power output, Wnet, to total heat transfer area, A, in the system is defined as g 1⁄4 Wnet (17) At 4. Results and discussion 4.1. Problem description A finite-temperature-difference heat transfer method, which means heat transfer occurred only with temperature difference between seawater and working fluid, is applied to evaluate the heat transfer area of the condenser and evaporator in an OTEC system with an ORC. R134a, R152a, R245fa, R600a, and R717 are used as the working fluids. In this study, the warm seawater flow rate remains fixed, the mass flow rate of working fluid varies to obtained the optimal temperature conditions. This section presents the results of parametric studies on the various working fluids in the system. The following general assumptions were made in thermodynamic analysis: 1. Steady-state conditions are applied to all components. 2. Warm seawater flow rate: 2000 kg/s. 3. Evaporation temperature: 18e24 C. 4. Condensation temperature: 8e14 C. 5. Cold seawater temperature: 5 C. 6. Warm seawater temperature: 28 C. 7. Seawater temperature differences between inlet and outlet are the same in the evaporator and the condenser. 8. Efficiencies of cold and warm seawater pumps and working fluid pump: 0.8. 9. Turbine efficiency: 0.9. 10. Condenser and evaporator are shell-and-tube heat ex- changers and the correction factor F is 0.9. The thermodynamic data used in this analysis are obtained from the National Institute of Standards and Technology (NIST) database REFPROP 9.0 [24]. 4.2. Verification To evaluate the accuracy of the power output calculation for the OTEC system, the numerical solution of net power output in the ORC system is verified using the results of Sun et al. [10]. The re- lationships between net power output and various mass flow rates of warm seawater are compared using R717 as the working fluid with Teva 1⁄4 22.2 C and Tcon 1⁄4 10.8 C. The cold and warm seawater inlet temperatures are assumed to be 5 C and 28 C, respectively, for the simulation. However, the power consumptions of cold and warm seawater pumps were not included in evaluating system power output, Wver, for verification. Overall comparison shows that the numerical solutions of this study agree well with those of Sun et al. [10], as shown in Fig. 3. 4.3. Performance optimization Fig. 4(a)e(c) plot the influence of evaporation temperature on net power output, total heat transfer area, and the objective Fig. 5. Dependence of (a) Wnet, (b) At, and (c) g on condensation temperatures at Teva 1⁄4 22.3 C and DTw 1⁄4 2.1 C. M.-H. Yang, R.-H. Yeh / Renewable Energy 68 (2014) 25e34 29PDF Image | Analysis of optimization in an OTEC plant using ORC
PDF Search Title:
Analysis of optimization in an OTEC plant using ORCOriginal File Name Searched:
yangyeh_otec2014.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)