PDF Publication Title:
Text from PDF Page: 025
Chapter 2 Summarizing, the selection of the working fluid affects at the same time the thermodynamic performance of the system, and the design of all its components. For a detailed treatment, the reader is referred to Ref. [7]. For example, if the thermal energy source features a relatively small potential and a rather high- temperature (say 2 MWT, and Tsource > 300 oC), the selection of a fluid formed by complex molecules (large specific heat) yields to a slightly superheated and regenerated cycle as the corresponding optimal cycle configuration. The rela- tively large volume flow due to the small enthalpy drop over the expansion allows for the design of an efficient and simple turbine, with sufficiently large flow pas- sages. In particular, the small specific expansion work allows also to limit the number of stages (e.g., 2 or 3), and the resulting rotational speed may be 10 − 20 times smaller compared to a steam turbine for the same operating conditions. The dominant need of reducing the number of stages, this increasing their pressure ratios, together with the low values of the sound speed of the expanding organic vapor, leads in most cases to the acceptance of highly supersonic flows, at least in the first stator, which therefore requires special care in the fluid dynamic de- sign. Depending on the condensing temperature, the volume flow at the outlet of the turbine can be large, thus requiring a comparatively bulky regenerator and condenser. As a consequence, cost issues related to the heat transfer equipment might arise. Additional challenges ensue in case vacuum conditions have to be managed. Conversely, the overall low maximum pressures in the system can be beneficial as far as the cost of the evaporator and safety issues are concerned. It is also notable that regeneration positively affects the thermal efficiency of the cy- cle, but negatively affects the temperature at which the heat source can be cooled (limited by the temperature of state 3 in figure 2.1a), thereby the amount of ther- mal power that can be converted into mechanical power. Similar reasoning can be applied to other applications, e.g., low- and medium-temperature geothermal energy conversion, leading to different results. The working fluid is also subjected to a number of other constraints, which can be more or less stringent depending on the application, namely the fluid should be ◦ non-toxic, non-flammable, non-corrosive, and cost-effective, ◦ characterizedbyaloworzeroGlobalWarmingPotential(GWP)andOzone Depletion Potential (ODP), ◦ thermally stable and compatible with all the containing and sealing materi- als up to the cycle maximum temperature, ◦ possibly a good lubricant, featuring also good heat transfer properties, 14PDF Image | New Concepts FOR Organic Rankine Cycle Power Systems
PDF Search Title:
New Concepts FOR Organic Rankine Cycle Power SystemsOriginal File Name Searched:
PhDTesis_ECasati.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 | RSS | AMP |