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Cooling effect analysis on para-ortho hydrogen conversion coupled in vapor-cooled shield |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Aerospace System Engineering Shanghai, Shanghai, 201108, PR China;3. PetroChina Southwest Oil& Gasfield Company, Chengdu, Sichuan, 610051, PR China;4. Shanghai Jiao Tong University Sichuan Research Institute, Chengdu, Sichuan, 610213, PR China;1. School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China;2. Pollution Prevention Biotechnology Laboratory of Hebei Province, Shijiazhuang 050018, China;3. Tianjushi Engineering Technology Group Co., Ltd, Shijiazhuang 050011, China;4. Shijiazhuang Donghua Jinlong Chemical Co., Ltd, Shijiazhuang 052165, China;1. Institute of Refrigeration and Cryogenic Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;2. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing, 100028, China;1. Scientific Consulting, Stattegg 8046, Austria;2. Institute for Mathematics and Scientific Computing, Karl-Franzens University of Graz, NAWI Graz, Heinrichstr. 36, 8010, Graz, Austria;3. Lavrentyev Institute of Hydrodynamics, Siberian Division of the Russian Academy of Sciences, 630090 Novosibirsk, Russia;1. Department of Chemical Engineering, Birla Institute of Technology and Science (BITS) Pilani, Rajasthan-333031, India;2. Centre for Nano Science and Engineering, Indian Institute of Science(IISC), Bengaluru, Karnataka 560012, India;3. Department of Chemical Engineering, New Mexico Institute of Technology, Socorro, NM 87801, USA |
| Abstract: | The conversion process from parahydrogen to orthohydrogen accompanies an endothermic effect. Embedment of a para-ortho hydrogen converter into the thermal insulation could enhance the thermal protection of a liquid hydrogen storage tank. A physical model was proposed to simulate the heat transfer behavior of the insulation structure that integrates a polyurethane foam, a blanket of multilayer insulation, a vapor-cooled shield, and a para-ortho hydrogen converter. The effect of the para-ortho conversion process was considered. The model was validated by experimental data and then used to investigate how the para-ortho hydrogen conversion influences the temperature distribution inside the composite insulation. It was found that a single converter improves the cooling performance most effectively if it is placed at the middle length of the venting pipe mounted on the vapor-cooled shield. Either incorporating more converters or extending the length of the vapor-cooled shield pipes brings limited further improvement. The optimum position of the vapor-cooled shield inside the multilayer insulation moves towards the cold boundary in the presence of para-ortho conversion, compared to conventional vapor-cooled shield and multilayer insulation structures. A net heat flux reduction of over 10% could be achieved when the para-ortho conversion is located at the optimal position inside the vapor-cooled shield. |
| Keywords: | Para-ortho hydrogen conversion Vapor-cooled shield Cooling effect Insulation POC"} {"#name":"keyword" "$":{"id":"pc_Se5KvRsdss"} "$$":[{"#name":"text" "_":"para to ortho conversion OPC"} {"#name":"keyword" "$":{"id":"pc_kOGdQXNvgP"} "$$":[{"#name":"text" "_":"ortho to para conversion TVS"} {"#name":"keyword" "$":{"id":"pc_uA0325Wyqm"} "$$":[{"#name":"text" "_":"thermodynamic vent system VCS"} {"#name":"keyword" "$":{"id":"pc_Jr86oOi3XC"} "$$":[{"#name":"text" "_":"vapor-cooled shield MLI"} {"#name":"keyword" "$":{"id":"pc_zRblslFMAR"} "$$":[{"#name":"text" "_":"multilayer insulation |
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