Carbide Synthesis from Graphite/molybdenum Powder Mixtures at Sub-Stoichiometric Ratios under Solar Radiation Heating to 1900&deg;C

The search for energetic alternatives and the concern about water preservation are novel ideas that challenge the humanity. This project was inspired in these challenges, being based in the utilization of solar energy for desalination of brackish water. A parabolic solar concentrator captures the solar radiation heating thermal fluid, which is closed-circuit circulated into a evaporator, which has three trays. The first has the functions of storing, pre-heating and condensing. The second works as an evaporator and the third stores the evaporated water. The system was tested with and without pump. The thermal fluid temperature reached 105°C and the amount of evaporated water reached 15kg/day. The equipment meets the social demand for sustainable inventions.

Download Full-text

The importance of cross-calibration and protecting water temperature sensors against direct solar radiation heating in hydrological studies

Hydrological Sciences Journal ◽

10.1080/02626667.2019.1688818 ◽

2019 ◽

Vol 65 (1) ◽

pp. 102-111 ◽

Cited By ~ 1

Author(s):

Daniel Caissie ◽

Nassir El-Jabi

Keyword(s):

Solar Radiation ◽

Water Temperature ◽

Temperature Sensors ◽

Direct Solar Radiation ◽

Radiation Heating ◽

Cross Calibration

Download Full-text

Transmission coefficient of the transparent insulation of flat diffuse solar radiation heating systems

Applied Solar Energy ◽

10.3103/s0003701x07010033 ◽

2007 ◽

Vol 43 (1) ◽

pp. 6-7 ◽

Cited By ~ 5

Author(s):

R. R. Avezov ◽

N. R. Avezova ◽

K. A. Samiev

Keyword(s):

Solar Radiation ◽

Transmission Coefficient ◽

Radiation Heating ◽

Heating Systems ◽

Diffuse Solar Radiation

Download Full-text

Preparation and Performance of Sintered Fe-2Cu-2Mo-0.8C Materials Containing Different Forms of Molybdenum Powder

Materials ◽

10.3390/ma12030417 ◽

2019 ◽

Vol 12 (3) ◽

pp. 417

Author(s):

Wenchao Chen ◽

Jigui Cheng ◽

Pengqi Chen ◽

Jianhua Zhang ◽

Bangzheng Wei

Keyword(s):

Compaction Pressure ◽

Green Density ◽

Test Results ◽

Molybdenum Powder ◽

Mechanically Alloyed ◽

Pressing Temperature ◽

Powder Mixtures ◽

Uniform Microstructure ◽

Fe Powder ◽

And Performance

Fe-2Cu-2Mo-0.8C powder mixtures were prepared by mixing Fe, Cu and C elemental powders with different forms of Mo-containing powder (pure Mo powder, prealloyed Mo-Fe powder and mechanically alloyed Mo-Fe powder, respectively). The powder mixtures were warm pressed under different pressures and temperatures. Properties of the green compacts and the sintered parts were tested to investigate the effects of the different ways of introducing molybdenum. The test results show that a green density of 7.32 g/cm3 was obtained for Fe-2Cu-2Mo-0.8C powder mixtures containing mechanically alloyed Mo-Fe powders, under a warm compaction pressure of 800 MPa and warm pressing temperature of 120 °C, respectively. The sintered Fe-2Cu-2Mo-0.8C specimens added with mechanically alloyed Mo-Fe powders had a density of 7.31 g/cm3, a hardness of 95 HRB and a tensile strength of 618 MPa, respectively. Compared with the sintered samples, added Mo in the forms of pure Mo and prealloyed Mo-Fe powder, the sintered parts added with mechanically alloyed Mo-Fe powders had more uniform microstructure, better mechanical and wear-resistant properties.

Download Full-text

Kinetic aspects of reaction between tantalum and carbon material (active carbon or graphite) under solar radiation heating

Solar Energy ◽

10.1016/j.solener.2006.01.001 ◽

2006 ◽

Vol 80 (12) ◽

pp. 1553-1560 ◽

Cited By ~ 21

Author(s):

Jorge Cruz Fernandes ◽

Fernando Almeida Costa Oliveira ◽

Bernard Granier ◽

Jean-Marie Badie ◽

Luis Guerra Rosa ◽

...

Keyword(s):

Solar Radiation ◽

Active Carbon ◽

Carbon Material ◽

Radiation Heating

Download Full-text

Weibull statistical analysis of flexure breaking performance for alumina ceramic disks sintered by solar radiation heating

Ceramics International ◽

10.1016/s0272-8842(99)00041-3 ◽

2000 ◽

Vol 26 (2) ◽

pp. 203-206 ◽

Cited By ~ 16

Author(s):

Jorge Cruz Fernandes ◽

Pedro Miguel Amaral ◽

Luı́s Guerra Rosa ◽

Nobumitsu Shohoji

Keyword(s):

Statistical Analysis ◽

Solar Radiation ◽

Alumina Ceramic ◽

Radiation Heating ◽

Weibull Statistical Analysis

Download Full-text

Fluid Dynamic Analysis on Solar Heating Error of Radiosonde MEMS Humidity Measurement

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.645-646.761 ◽

2015 ◽

Vol 645-646 ◽

pp. 761-765 ◽

Cited By ~ 1

Author(s):

Xiao Li Mao ◽

Jia Hong Zhang ◽

Min Li ◽

Shao Rong Xiao ◽

Qing Quan Liu

Keyword(s):

Fluid Dynamics ◽

Numerical Analysis ◽

Solar Radiation ◽

Humidity Sensor ◽

Fluid Dynamic ◽

Dynamics Simulation ◽

Analysis Model ◽

Radiation Heating ◽

Humidity Measurement ◽

Dry Bias

The dry bias of MEMS humidity sensor induced by solar radiation heating seriously affects the accuracy of the relative humidity (RH) measurement. To solve this problem, this paper presents a novel numerical analysis method for the error correction of RH based on computational fluid dynamics (CFD). Firstly, considering the solar radiation, the distribution of temperature field of MEMS humidity sensor is simulated from the ground to 32km altitude by using CFD soft under the boundary condition of fluid-solid coupled heat transfer. Secondly, the numerical analysis model of RH is put forward for solar radiation dry bias (SRDB) correction based on the working principle of the MEMS capacitive humidity sensor and the definition of RH. The results of numerical analysis show that the error of RH caused by solar radiation is nonlinearly increased with the altitude. Meanwhile the errors decrease with the reflectivity of sensor or of solder point increase. The simulation data also indicate that the SRDB can be reduced by improving the reflectivity of sensor or of solder point, adopting the substrate material with high thermal conductivity or choosing the suitable thickness of sensor. However, the SRDB should be corrected, for it still is more than 20% under the low atmospheric pressure. In this paper, the method based on fluid dynamics simulation provides a new way to correct the error of radiosonde MEMS humidity measurement caused by solar radiation heating.

Download Full-text