Conveners
C1Po2D - Heat Exchangers
- Bertrand Baudouy (CEA Saclay)
- John Weisend (European Spallation Source ESS AB)
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Mr Ashish Kumar (The Graduate University for Advanced Studies (SOKENDAI))22/07/2019, 14:00Poster Presentation
Superfluid cryogenics systems at KEK are constructed for research and development of cryomodules of the compact Energy Recovery Linac (cERL) and International Linear Collider (ILC). The niobium superconducting radio frequency (SRF) cavities in the cERL and ILC, operate at temperatures of 2.0 K or below. The SRF cavities are cooled with saturated superfluid helium, which is another phase of...
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Prof. Houlei Chen (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)22/07/2019, 14:00Poster Presentation
It has always been a research hotspot to improve the overall efficiency of pulse tube cryocooler and the regenerator as the core component of the pulse tube cryocooler directly determines the performance of the overall machine. Therefore, an approach of improving the efficiency of the whole machine has been provided as improving the performance of the regenerator. This paper is based on a...
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Prof. Houlei Chen (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)22/07/2019, 14:00Poster Presentation
The multi-bypass is one of the effective ways to reduce the lowest no-load temperature of pulse tube cryocooler. The common structure of multi-bypass is to use a thin tube to connect the middle of the pulse tube to the middle of the regenerator which can reduce the mass flow through the regenerator and adjust the phase angle of the cold end for the refrigerator, which effectively reducing the...
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Ms Chi Chunyun (1.Technical Institute of Physics and Chemistry, Chinese Academy of Sciences 2.University of Chinese Academy of Sciences)22/07/2019, 14:00Poster Presentation
Abstract:The regenerator is the core heat exchange component of the Stirling engine, and the structural form and physical properties of the filling material are the vital important factor determining its performance. In this paper, a three-dimensional model of the regenerator is established using Ansys' fluent module to simulate the regenerative flow in the alternating flow. The property of...
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Dr Weiping Zhu (State Key Laboratory of Technologies in Space Cryogenic Propellants(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences),)22/07/2019, 14:00Poster Presentation
To reduce the volume of hydrogen or helium cryogenic refrigerator and
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liquefaction, we need the minimum volume to achieve the efficiency and the
pressure loss of the plate-fin heat exchangers given by the process. For
this purpose, this paper presented a new comprehensive performance factor
S = J^3As^2/(fV^2), which means ε/(∆p·V_{eff}) or ε/(w_{pump}*V_{eff}). Based on the performance... -
Ali Ghavami (Georgia Tech)22/07/2019, 14:00Poster Presentation
The regenerator is a key component of a pulse tube cryocooler, and is also a major contributor to irreversibility and losses in the cryocooler. In this study a method for the assessment of losses in cryocooler regenerators based on entropy generation is proposed. Pore-level CFD simulations are performed for woven mesh regenerator filler by defining periodically repeating unit cells....
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