New Concepts FOR Organic Rankine Cycle Power Systems

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New Concepts FOR Organic Rankine Cycle Power Systems ( new-concepts-for-organic-rankine-cycle-power-systems )

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the rest of the setup: one leads to the HFT, while the other leads to the charge tube. The thermal input is provided by a 335 W glass silk heating jacked, which includes a 25 mm glass silk insulation layer. 7.3.4 Charge Tube The charge tube, or CT, is the long pipe through which pressure waves propagates. The inside diameter is equal to 40 mm, and the inner surface is rectified and electrolytically polished in order to reduce friction effects which cause attenuation in the propagating waves. The 15 mm thick walls enhance an even distribution of the thermal power. It is built up of six elements of 1520 mm length each, joined through custom made male-to-female connections with copper seals. The entire pipe measures 9 m in total, and is placed on sliding supports which allow for thermal expansion. Each section is heated by a 950 W glass silk heating jacket, which includes a 25 mm thick insulation layer. One end of the pipe connects to the fast opening valve which is inserted into the LPP, while at the other end a PT-100 temperature sensor is mounted (TE3.0 in Fig. 7.4). The pressure measurement stations are created by flush-mounting four high frequency pressure transducers along the CT at a distance of 4, 4.3, 8.4 and 8.7 m from the FOV (PIT1−PIT4). The instruments are placed in pairs in order to perform speed of flight measurements at two different locations in the tube. In the case of a RSW in D6, a RSW is expected to form between the first and second measurement pair [25]. 7.3.5 Fast Opening Valve The most complex piece of equipment of the setup is the fast opening valve, or FOV, contained in the LPP and shown in Fig. 7.6. This custom designed component is able to operate up to 400◦C without lubrication, in order to avoid contamination of the working fluid. When the FOV is in the opened position, the working fluid can flow through the venting holes present in the inner and outer body. In the closed position, a sliding cylinder is interposed between these two bodies, obstructing the venting holes. The sliding cylinder is pressed into a perfluoroelastomer compound sealing pad on the flange to ensure the first sealing point. The second sealing is performed by a perfluoroelastomer O-ring placed between the sliding cylinder and the inner body. A high temperature spring built with austenitic nickel-chromium steel is compressed while closing the FOV, and three radial clamps are used to prevent it from being released. To open the FOV, the clamps are actuated, allowing the spring to push the sliding cylinder away, thus leaving the venting holes open. A movable nozzle insert allows to fine-tune the throat section, i.e. the minimum flow passage area, in the range 420 − 600 mm2. A peculiarity of this valve is that the nozzle is located on the high pressure side of the sealing, as opposite to typical solutions adopted in Ludwieg tube facilities [45, 46]. 7.3.6 Low Pressure Plenum After the FOV has been opened, the fluid flows into a 113 liter low pressure plenum (LPP), contain- ing the FOV itself. The LPP has an outer diameter of 406.4 mm and 9.53 mm thick stainless steel walls. The electric motor triggering the FOV and the manual nozzle positioning gear are mounted on the LPP with sealed feedthrough shaft connections. At the bottom, the vessel is connected to the condenser. A lid with a 648 mm diameter flange gives access to the vessel interior for installation of the FOV, sealed by a graphite gasket compressed by 20 Mx50 bolts. The thermal input to the vessel is supplied by four heating jackets with a nominal power of 1450, 425, 960 and 490 W. Commissioning of the FAST setup 185

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