Experimental Study of LOFA, LOHA and Natural Circulation Performance of the TTL-2 Thermal Hydraulic Test Loop and Modeling With RELAP5 System Code

, M.Sc. Thesis Sharif University of Technology Arabnezhad, Hadi (Author) ; Ghofrani, Mohammad Bagher (Supervisor) ; Jafari, Jalil (Supervisor)

Abstract

In this survey the TTL-1 thermal hydraulic test loop in Nuclear Science and Technology Research Institute (NSTRI) has been modified to study thermal hydraulic phenomenon in research reactor thermal condition. These modifications include: replacing the test section containing a single heating rod by a group of 31 rods in a triangular array, relocating the pressurizer from the cold leg to the hot leg and improving piping of the test loop. In order to measure the time dependant flowrate of the coolant, a rotameter flowmeter is added. Three level meter measure the water level in pressurizer, test section and the primary loop drain tank and a 3-phase AC inverter controls the rotational speed of...

Numerical Modeling of Hydrothermal Behavior of Geothermal Tunnels in Sandy Soils

, M.Sc. Thesis Sharif University of Technology Ashkbari, Mohammad Amin (Author) ; Ahmadi, Mohammad Mehdi (Supervisor)

Abstract

Shallow geothermal energy is a renewable and sustainable form of energy that has the potential to help alleviate the growing climate and energy crisis. The most common system used to extract shallow geothermal energy is the ground source heat pump (GSHP) system. The concept of using underground structures in exploiting shallow geothermal energy for space heating and cooling has received increasing attention. This study focuses on the use of geothermal tunnels as a means of extracting shallow geothermal energy.This research examines the effects of different heat transfer mechanisms, and highlights the effects of this phenomenon by focusing on the effects of natural convection around the...

Numerical Modeling of Hydrothermal Behavior of Geothermal Piles in Sandy Soils

, M.Sc. Thesis Sharif University of Technology Mehraeen, Naghmeh (Author) ; Ahmadi, Mohammad Mehdi (Supervisor)

Abstract

This study highlights an important distinction between heat transfer mechanism in dry and saturated soil. Soil temperature data recorded during model tests, soil thermal response predicted using finite difference and analytical methods are compared with finite element models. In recent years, due to the industrial development of human societies, the energy consumption has been increased worldwide. On the other hand, the most commonly used energy resources are non-renewable energies. Therefore, governments and industries aimed to develop a technology which provides economical use of renewable energy sources. One of the renewable energy sources is the geothermal energy of the Earth. In this...

Numerical Modeling of Thermo-Hydro-Mechanical Behavior of Deep Geothermal Reservoirs

, M.Sc. Thesis Sharif University of Technology Bannae Sharifian, Mohammad Reza (Author) ; Pak, Ali (Supervisor)

Abstract

All societies need energy to meet the basic needs of the people and to carry out the production processes. From 1850 onwards, the global use of fossil fuels (coal, oil and gas) for energy production increased, leading to a dramatic increase in the emission of carbon dioxide (CO2) into the atmosphere. Rising carbon dioxide and other greenhouse gases in the Earth's atmosphere and seeing adverse effects such as global warming have prompted the international community to replace fossil fuels with clean energy as much as possible. Geothermal energy as one of the clean, sustainable and extensive sources can be one of the available solutions to meet this need.Numerical modeling of geothermal...