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A versatile method for estimating grout and ground thermal properties in a thermal response test
, Article Applied Thermal Engineering ; Volume 233 , 2023 ; 13594311 (ISSN) ; Biglarian, H ; Hakkaki Fard, A ; Sharif University of Technology
Elsevier Ltd
2023
Abstract
Ground-Source Heat Pumps (GSHPs) are efficient means of space heating and cooling. However, owing to their high installation costs, their development in societies has not grown as it should. Therefore, it is crucial to have a meticulous design of these systems. The first step in designing GSHPs is determining the ground and grout thermal properties. Thermal Response Tests (TRTs) are developed for this purpose. The previous methods of estimating the unknown thermal properties are either inefficient or yield inaccurate estimates for the ground volumetric heat capacity, to which the mean fluid temperature has the slightest sensitivity among all thermal properties. Among previous methods, some...
Spot Resistance Welding of St12 and HSLA Steels in Different Thicknesses
, M.Sc. Thesis Sharif University of Technology ; Kokabi, Amirhosein (Supervisor) ; Ekrami, Aliakbar (Supervisor)
Abstract
High-strength low alloy (HSLA) E275 developed specifically for automotive application. Also St12 Steel is used in autobodies. On the other hand the resistance spot weld of dissimilar materials is generally more challenging than that of similar materials due to differences in the physical, chemical and mechanical properties of the base metals. The influence of the primary welding parameters affecting the heat input such as; current and time on the morphology, fracture mode, microhardness, and tensile shear load bearing capacity of dissimilar welds between HSLA E275 steel and St12 steel in two different thicknesses (1,2 mm) has been investigated in this study which consisted six group. The...
Security Enhancement Wireless Body Sensor Networks
, M.Sc. Thesis Sharif University of Technology ; Jahangir, Amirhosein (Supervisor) ; Nazarishirejini, Ali Asghar (Supervisor)
Abstract
The use of wearable surveillance systems and wireless body sensor networks is an economical solution to medical care, which is capable of detecting abnormal conditions early, and by controlling the health status and enabling one to engage in normal and daily activities, improves the patient's quality of life. Information and communication security is very important in this area and its violation may even endanger the life of the patient. The selection and application of the appropriate security mechanism for a wireless body sensor network is subject to consider the requirements and limitations of the network. One of the most important security requirements in this area is the...
Estimation of Ground Thermal Properties Using Inverse Heat Transfer Techniques
, M.Sc. Thesis Sharif University of Technology ; Hakkakifard, Ali (Supervisor) ; Kazemzadeh Hannani, Siamak (Supervisor) ; Biglarian, Hassan (Co-Supervisor)
Abstract
Ground-Source Heat Pumps (GSHPs) are efficient means of space heating and cooling. However, owing to their high installation costs, their development in societies has not grown as it should. Therefore, it is crucial to have a meticulous design of these systems. The first step in designing GSHPs is determining the ground and grout thermal properties. Thermal Response Tests (TRTs) are developed for this purpose. The previous methods of estimating the unknown thermal properties are either computationally inefficient or yield inaccurate estimates for the ground volumetric heat capacity, to which the mean fluid temperature has the slightest sensitivity among all thermal properties. Among previous...