The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Robert Cerný - One of the best experts on this subject based on the ideXlab platform.
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hygrothermal performance study of an innovative interior thermal Insulation System
Applied Thermal Engineering, 2009Co-Authors: Zbysek Pavlik, Robert CernýAbstract:An innovative interior thermal Insulation System on the basis of hydrophilic mineral wool which can serve as an alternative solution to the commonly used Systems with water vapor barrier is presented in the paper. At first, the process of materials design is described. Then, the hygrothermal performance of the designed Insulation System is tested in the difference climate conditions that correspond to the winter climate in Middle Europe. In the experiment, the profiles of temperature, relative humidity and liquid moisture content are monitored. Measured temperature profiles demonstrate the proper thermal Insulation function of the System. The hygric function can also be considered very good as no water condensation during the whole testing period of five months appears in the Insulation layer. Therefore, the basic requirements for the successful application of the System in building practice are met.
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long term on site assessment of hygrothermal performance of interior thermal Insulation System without water vapour barrier
Energy and Buildings, 2009Co-Authors: J Toman, Alena Vimmrova, Robert CernýAbstract:On-site assessment of hygric and thermal performance of an interior thermal Insulation System on the basis of hydrophilic mineral wool is presented in the paper. The System is applied during the summer period on a brick-built house from the end of 19th century. Hygrothermal testing is done during the time period of 4 years. The reconstructed building envelope exhibits very good hygrothermal performance. The thermal resistance increases approximately two times. Water condensation is never observed inside the envelope during the whole testing period. A comparison with the previous experiment in semi-scale conditions which was performed for similar Insulation System constructed during the winter season shows that the precedence should be given to the application of the System in summer period as it is more considerate to the old masonry.
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experimental assessment of hygrothermal performance of an interior thermal Insulation System using a laboratory technique simulating on site conditions
Energy and Buildings, 2008Co-Authors: Zbysek Pavlik, Robert CernýAbstract:A laboratory technique simulating on-site conditions is used for hygrothermal performance assessment of two building envelopes. Interior thermal Insulation System on the basis of hydrophilic mineral wool which is applied on two common load bearing structures is analyzed. Sufficiently large specimens of studied building envelopes are exposed to difference climate conditions very close to reality. Monitoring of moisture and temperature fields in the investigated structures is carried out using laboratory measuring technology. Experimental results give evidence that the hygrothermal performance of both tested building envelopes is satisfactory.
Zbysek Pavlik - One of the best experts on this subject based on the ideXlab platform.
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hygrothermal performance study of an innovative interior thermal Insulation System
Applied Thermal Engineering, 2009Co-Authors: Zbysek Pavlik, Robert CernýAbstract:An innovative interior thermal Insulation System on the basis of hydrophilic mineral wool which can serve as an alternative solution to the commonly used Systems with water vapor barrier is presented in the paper. At first, the process of materials design is described. Then, the hygrothermal performance of the designed Insulation System is tested in the difference climate conditions that correspond to the winter climate in Middle Europe. In the experiment, the profiles of temperature, relative humidity and liquid moisture content are monitored. Measured temperature profiles demonstrate the proper thermal Insulation function of the System. The hygric function can also be considered very good as no water condensation during the whole testing period of five months appears in the Insulation layer. Therefore, the basic requirements for the successful application of the System in building practice are met.
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experimental assessment of hygrothermal performance of an interior thermal Insulation System using a laboratory technique simulating on site conditions
Energy and Buildings, 2008Co-Authors: Zbysek Pavlik, Robert CernýAbstract:A laboratory technique simulating on-site conditions is used for hygrothermal performance assessment of two building envelopes. Interior thermal Insulation System on the basis of hydrophilic mineral wool which is applied on two common load bearing structures is analyzed. Sufficiently large specimens of studied building envelopes are exposed to difference climate conditions very close to reality. Monitoring of moisture and temperature fields in the investigated structures is carried out using laboratory measuring technology. Experimental results give evidence that the hygrothermal performance of both tested building envelopes is satisfactory.
A. Nakayama - One of the best experts on this subject based on the ideXlab platform.
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Development of global vacuum pressure impregnation Insulation System for turbine generators
Proceedings of 1998 International Symposium on Electrical Insulating Materials. 1998 Asian International Conference on Dielectrics and Electrical Insu, 1998Co-Authors: A. NakayamaAbstract:Fuji Electric has developed a global vacuum pressure impregnation Insulation System for large size turbine generators (F-resin/G II Insulation System) together with introduction of required manufacturing equipment since 1990, and had put into practical use in 1993. After that, numerous generators having maximum output of 158 MVA have been manufactured utilizing this Insulation System and have been operated successfully. Though this Insulation System is mainly applied to air cooled turbine generators with output range of from 20 to 260 MVA, it is also possible to manufacture hydrogen cooled turbine generators with output range of from 50 to 340 MVA, utilizing the merits of global vacuum pressure impregnation Insulation System.
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Evaluation of mechanical characteristics for a new vacuum pressure impregnation Insulation System
Proceedings of 1995 International Symposium on Electrical Insulating Materials, 1995Co-Authors: A. NakayamaAbstract:Fuji Electric has recently introduced a vacuum pressure impregnation (VPI) System for air-cooled turbine generator stator windings in the 30/spl sim/260MVA class. To accompany this, we have also developed a new Insulation System for this VPI System, called the F-resin/GII Insulation System. This Insulation System is equipped with characteristics for operation over a long period of time and excellent heat cycle resistance. In this article, an evaluation of the mechanical characteristics of the main Insulation for the new VPI Insulation System is described.
Junjie Wang - One of the best experts on this subject based on the ideXlab platform.
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a novel cryogenic Insulation System of hollow glass microspheres and self evaporation vapor cooled shield for liquid hydrogen storage
Frontiers in energy, 2019Co-Authors: Jianpeng Zheng, Liubiao Chen, Junjie Wang, Ping Wang, Jingjie Zhang, Yuan ZhouAbstract:Liquid hydrogen (LH2) attracts widespread attention because of its highest energy storage density. However, evaporation loss is a serious problem in LH2 storage due to the low boiling point (20 K). Efficient Insulation technology is an important issue in the study of LH2 storage. Hollow glass microspheres (HGMs) is a potential promising thermal Insulation material because of its low apparent thermal conductivity, fast installation (Compared with multi-layer Insulation, it can be injected in a short time.), and easy maintenance. A novel cryogenic Insulation System consisting of HGMs and a self-evaporating vapor-cooled shield (VCS) is proposed for storage of LH2. A thermodynamic model has been established to analyze the coupled heat transfer characteristics of HGMs and VCS in the composite Insulation System. The results show that the combination of HGMs and VCS can effectively reduce heat flux into the LH2 tank. With the increase of VCS number from 1 to 3, the minimum heat flux through HGMs decreases by 57.36%, 65.29%, and 68.21%, respectively. Another significant advantage of HGMs is that their thermal Insulation properties are not sensitive to ambient vacuum change. When ambient vacuum rises from 10−3 Pa to 1 Pa, the heat flux into the LH2 tank increases by approximately 20%. When the vacuum rises from 10−3 Pa to 100 Pa, the combination of VCS and HGMs reduces the heat flux into the tank by 58.08%–69.84% compared with pure HGMs.
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experimental study on composite Insulation System of spray on foam Insulation and variable density multilayer Insulation
Applied Thermal Engineering, 2018Co-Authors: Jianpeng Zheng, Liubiao Chen, Yuan Zhou, Junjie WangAbstract:Abstract The composite Insulation System of spray on foam Insulation (SOFI) and multilayer Insulation (MLI)/variable density multilayer Insulation (VDMLI) is regarded as the most promising Insulation System for cryogenic propellant in space application. In this paper, the composite Insulation System composed of SOFI and MLI/VDMLI is studied in theoretical analysis and experimental testing. A test bed has been built to test the Insulation performance of the Insulation System. Heat leakage and temperature distribution of the Insulation System were measured and analyzed. Theoretical calculation was carried out by “Layer by layer method” and “Lockheed method”. Composite Insulation System was tested with simulated fluid of liquid nitrogen in high vacuum condition and atmospheric pressure condition, respectively. The test results show that the thermal resistance of SOFI accounts for only 0.12% of the total thermal resistance in high vacuum condition experiment, while 45.37% in atmospheric pressure condition experiment. With 50 layers of reflector, the measured heat leakage of VDMLI is lower than that of MLI by 13.57%, and heat flux decreases by 17.49%. By comparing the experimental results and the calculated value, it can be found that Lockheed method and Layer by layer method are suitable for calculating heat flux through MLI, but need to be improved in solving the temperature distribution.
H. Nishi - One of the best experts on this subject based on the ideXlab platform.
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high temperature thermal Insulation System for millimeter wave sintering of b4c
International Journal of Infrared and Millimeter Waves, 2005Co-Authors: H. Hoshizuki, S. Mitsudo, T. Saji, K. Matsuura, T. Idehara, M. Glyavin, A. Eremeev, T. Honda, Y. Iwai, H. NishiAbstract:Boron carbide (B4C) is one of advanced materials and is being used in a wide rage of applications. The unique feature of this material is its large neutron-absorbing cross-section. Some of its most prominent applications are controlling rods in nuclear reactors and radiation protection. 24 GHz microwave processing for B4C ceramics were performed under flowing argon gas using the sintering System. Sintering at the high temperature (up to 2200°C) was achieved using thermal Insulation System consists of fiber-board, boron nitride powder, and boron nitride case. The sintered samples were achieved 90 % of theoretical.
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High Temperature Thermal Insulation System for Millimeter Wave Sintering of B_4C
International Journal of Infrared and Millimeter Waves, 2005Co-Authors: H. Hoshizuki, S. Mitsudo, T. Saji, K. Matsuura, T. Idehara, M. Glyavin, A. Eremeev, T. Honda, Y. Iwai, H. NishiAbstract:Boron carbide (B_4C) is one of advanced materials and is being used in a wide rage of applications. The unique feature of this material is its large neutron-absorbing cross-section. Some of its most prominent applications are controlling rods in nuclear reactors and radiation protection. 24 GHz microwave processing for B_4C ceramics were performed under flowing argon gas using the sintering System. Sintering at the high temperature (up to 2200°C) was achieved using thermal Insulation System consists of fiber-board, boron nitride powder, and boron nitride case. The sintered samples were achieved 90 % of theoretical.
