Conveners
C2PoL - Large Scale Simulation
- Lars Blum (Linde Kryotechnik AG)
- Anindya Chakravarty (Bhabha Atomic Research Centre, India & FNAL)
The accuracy of correlations of colburn(j) and friction(f) factor has important effect on the accuracy of simulation results in the dynamic simulation of large scale cryogenic helium systems. However，air was commonly used as heat transfer medium to derive most correlations available in the literatures and experimental results. In order to study the heat transfer and pressure drop...
A 250 W@4.5 K helium refrigerator has been developed in the Technical Institute of Physics and Chemistry, CAS. To establish operation control strategies and provide a user friendly human machine interface, a dynamic real-time simulator has been developed for this helium refrigerator based on software EcosimPro and Siemens PLC S7-300. This helium refrigerator which consists of one screw...
Guo et al introduced the physical quantity entransy to describe the heat transfer ability of an object, and then use the entransy dissipation to measure the loss of such ability due to the irreversibility of heat transfer. Liu and Guo defined the entransy dissipation based-thermal resistance (EDTR) for heat exchanger. The formulation of EDTR by heat capacity and effectiveness is introduced in...
The Linac Coherent Light Source II (LCLS-II), a 4 GeV continuous-wave (CW) superconducting electron linear accelerator, is to be constructed in the existing two mile Linac facility at the SLAC National Accelerator Laboratory. The first light from the new facility is scheduled to be in 2019. The LCLS-II Linac cryomodules consist of thirty-five, 1.3 GHz and two, 3.9 GHz superconducting...
Abstract: In this paper, a dynamic modeling and simulation of a large-scale helium refrigerator was set up and analyzed. Numerical models of the critical equipment including a screw compressor, six plate-fin heat exchangers, two turbine expanders, and four pneumatic valves are individually developed. In order to increase the simulated accuracy of the temperature profile of the heat exchangers,...
A helium phase separator with a condenser is under fabrication and assembly at National Synchrotron Radiation Research Center (NSRRC). The objective of a helium phase separator with its condenser is to separate two-phase helium flow and to re-condense vaporized gaseous helium with a cryo-cooler of Gifford-McMahon type. We developed a 100L helium phase separator with a small heat loss as a...
The China Fusion Engineering Test Reactor (CFETR) is envisioned to be constructed in the 2020s and start operation in the 2030s, according to the roadmap of China magnetic confinement fusion development. The updated design of the CFETR magnet system consists of 12 toroidal field (TF) and 6 poloidal field (PF) coils, a central solenoid (CS) coil stacked with 6 modules and 12 correction coils...
Abstract: In 300-80 K precooling stage, the temperature of the HP helium stream reduces to about 80K with achieving 73% of total enthalpy drop. Apart from the most common liquid nitrogen precooling stage, another 300-80 K precooling configuration with turbine(s) is employed in some helium cryoplant. In this paper, thermodynamic and economical performance of two kinds of 300-80 K precooling...
