Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Plant physiology --- woody plants --- Salt tolerance --- Salinity

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This master thesis aims to improve a numerical tool that simulates the heat transfers taking place on the Dynacor molten salt test loop built by John Cockerill. The purpose of this loop is to reproduce the conditions met in the receiver of a concentrated solar power plant using molten salt in order to analyze the corrosive effect of the salt in these conditions. We also wanted to establish test plans to experimentally assess parameters of the test section that cannot directly be measured and to analyze the data retrieved from the first circulations performed on the loop.
The thesis therefore contains an introduction developing the context in which the Dynacor loop was built and a state of the art on molten salt loops. The Dynacor loop is then presented in greater detail so the reader can understand the computations implemented in the heat balance assessment tool. This latter is described in a chapter including a description of the initial tool which was coded in Visual Basic for Applications followed by the development of the improved tool coded in Python. After that, a chapter is dedicated to the description of test plans to evaluate the coating resistivity and the heat transfer coefficient at the test section. A procedure to determine the uncertainty associated to these computed parameters is also given. The data from a first circulation on the test loop are then analyzed and compared to the python tool results in order to calibrate this latter before concluding the master thesis.
The developed Python tool behaves as expected qualitatively and could be further calibrated by performing more circulations on the Dynacor loop. A user friendly interface could also be added to this tool. Concerning the assessment of the parameters at the test section, no conclusion can be given for now since no test has already been performed.

molten salt --- corrosion test loop --- simulation --- Ingénierie, informatique & technologie > Energie

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Sol salin --- Saline soils --- Évaluation --- evaluation --- Méthode statistique --- Statistical methods --- Conductivité électrique --- Electrical conductivity --- Cartographie --- cartography --- 631.413.3 --- Salt accumulation. Salt content --- Theses --- Sciences and engineering --- biological sciences --- agriculture --- agronomy --- biology --- biostatistics --- soil science --- 631.413.3 Salt accumulation. Salt content --- agronomy. --- biostatistics. --- soil science. --- evaluation. --- Entropie --- Variabilite spatio-temporelle --- Biological sciences --- Agriculture --- Agronomy. --- Soil science. --- Biology --- Biostatistics.

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Sel --- Mines préhistoriques. --- Salt industry and trade. --- Mines (sites d'extraction) --- Histoire.

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Salt-affected soils can be found throughout the continents and are a major issue for agriculture. In order to evaluate the potential of rehabilitation of saline-sodic soils in the High Valley of Cochabamba in Bolivia, three different remediation techniques were tested: two by chemical amendments, gypsum and sulphur, and one by phytoremediation with the native halophyte Suaeda foliosa. An experiment was carried out in pots containing saline-sodic soil in a greenhouse to evaluate the effect of these management techniques on the saline properties of the soil. Two different doses of the gypsum requirement (GR) and sulphur requirement (SR) were tested, 100% of the GR/SR and 50% of the GR/SR. As for the phytoremediation treatment plants of 1-2 months and of 3-4 months were put to trial. Treatments with chemical amendments managed to decrease Exchangeable Sodium Percentage (ESP) from 70% down to 27%, 43%, 52% and 58% for the 100% - GR, 50% - GR, 100% - SR and 50% - SR respectively. For all the chemical treatments, the electrical conductivity (EC) was reduced by more than 50% and the pH was significantly reduced. Even though, EC, pH and ESP was reduced after the chemical amendment treatments, they are still above the threshold values for the soil to be characterised as non-saline-sodic. The results for the phytoremediation treatments weren’t as promising with increased values of ESP and EC. A longer-term experiment should be carried out to continue the evaluation of the reclamation by chemical amendments and the phytodesalination capacity of Suaeda foliosa.

gypsum, sulphur, phytoremediation, salt-affected soils --- Sciences du vivant > Sciences de l'environnement & écologie