The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this study, in-situ experiments and numerical simulations were used to study the heat transfer characteristics of a heat exchange system, a vertical deep-buried U-bend pipe with a buried depth of >2000 m to supply heat to buildings in Xi'an using geothermal energy. The in-situ experimental conditions include a constant inlet temperature and water flow rate in the deep-buried pipe, and the inlet...
A novel solar grading collector/regenerator system with heat recovery is proposed in this paper and a mathematical model of system is established. Numerical simulation shows that heat recovery does increase the performance of system reaching increments of 104% and 320% respectively for grading solar collector/regenerator with all heat recovery (Mode E) and single solar collector/regenerator with heat...
This paper proposes a general method to optimize the structure and load current for a segmented thermoelectric generator (TEG) module, where the bismuth telluride is selected as the cold side material, and the skutterudite is selected as the hot side material, respectively. Two objectives, minimum semiconductor volume V′ and maximum output power P, are simultaneously considered to assess the performance...
The purpose of this study is to demonstrate the feasibility of using an abandoned oil well as a geothermal resource. A three-dimensional numerical model of a U-tube heat exchanger is simulated based upon the real field data of an abandoned oil well located in southern Iran. To assess and optimize the performance of the heat exchanger, the influences of mass flow rate, fluid inlet temperature, insulation...
This study first assessed the performance of four global mechanisms, including the Westbrook and Dryer (WD) and Jones and Lindstedt (JL) mechanisms, and two preliminary refined versions of them (WD1/JL1), for predicting coal combustion under moderate or intense low-oxygen dilution (MILD) in a lab-scale furnace. The WD/WD1 mechanisms could predict coal MILD combustion well, while the other two performed...
This study presents a novel loop heat pipe central receiver for the solar power tower (SPT) plant. For the first study, the evaporator section of the proposed receiver is simulated by a three-dimensional numerical model to study the flow, heat transfer and the evaporation phenomenon of the working fluid. In addition, effects of the outlet boundary pressure at the vapor groove and the solar irradiation...
As one of the renewable energy systems, the enhanced geothermal system (EGS) played an important role in relieving energy crisis as a supplement for the existing energy systems. The costs were a key factor restricting the practical application of an EGS project. Therefore, an economic analysis before the establishment of EGS is particularly important to conduct. The aim of this research is to discuss...
Coalbed methane production in Jharia coalfield that lies in India's largest coal basin is underway since a few years now; however, no field-trial of CO2 enhanced coalbed methane (ECBM) recovery has been attempted till date. In this study, a detailed assessment of the techno-feasibility of long-term ECBM recovery for a coal block in Jharia coalfield was conducted using finite difference based numerical...
Many hydrate-bearing sediments are featured with unconsolidated argillaceous siltstones, which can pose a great challenge for gas production due to the migration of fine clay and silt particles (or sandout) that can restrict sustainable gas flow. In this study, based on the geological characteristics of unconsolidated argillaceous siltstones in typical subsea sediment, a controlled sandout or limited...
Under different relative inflow angles, this paper studies the control mechanism of off-surface small structure which is referred as micro-cylinder. With varying positions, the effect of micro-cylinder on reducing the flow separation on the horizontal axis wind turbine blade is investigated and the following results are found: (1) Under the condition of U∞ = 13 m/s, when it is closer to the blade...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.