volume-16-Issue 1 (2020)
Latest Articles
Towards Solar Pond Design and Development for Masdar City Environment
IJTEE, volume-16, Issue 1 (2020) , PP 59 - 64
Published: 07 Aug 2020
DOI: 10.5383/ijtee.16.01.008
by Khadije El Kadi, Isam Janajreh from Mechanical and Materials Engineering Department, Khalifa University of Science and Technology, Masdar Institute, Masdar City, P.O Box 54224, Abu Dhabi, United Arab Emirates
Abstract: Salinity-gradient solar ponds (SGSP) are water bodies that serves as a solar thermal energy storage system. Establishing a salinity gradient and observing the role of gravity and diffusion between the different zones is key-point in achieving optimal system performance. In this work, a numerical model is developed using computational fluid dynamics (CFD)acting as an initial step in designing and building a solar pond located in Masdar City for the usage of space cooling and desalination. The model is governed by continuity, species transport, momentum, and energy equations of naturally convicted, transient and non-isothermal flow. Results show the stability of the three working zones of the pond if carefully are injected and established. Although diffusion lingers for long time, it is balanced by the gravity forces that slows its propagation and confined it to a thin layer located at corresponding interfaces between zones. This work numerically shows the diffusion influence on the extent of stability of the three core zones of the solar pond. It demonstrates how one could achieve sustainable salinity and temperature gradients to ensure reliable working principle of the sola pond. read more... read less...
Keywords: Solar pond, Salinity gradient, CFD, SGSP, Solar thermal, Energy storage
Study of an Electric Energy Generation System from Exhaust Waste Recovery from an Internal Combustion Engine
IJTEE, volume-16, Issue 1 (2020) , PP 51 - 58
Published: 07 Aug 2020
DOI: 10.5383/ijtee.16.01.007
by Jorge de-J. Lozoya-Santos, Jonathan Rivas Torres, Adán Sáenz Herrera, Julio C. Salinas-Maldonado, Eduardo Mariscal Hay, Adriana Vargas-Martínez from Universidad de Monterrey, San Pedro Garza García, México
Abstract: A conventional car engine uses at best about one-third of the fuel combustion energy, while the rest of the energy is lost in friction and most in heat. In the face of the new emission regulations proposed by the government due to the high levels of pollution, and with the aim of achieving cleaner and more efficient transportation, vehicle exhaust gas recovery is being researched in the last years. It is of interest for the automotive industry to recover this wasted energy, thus increasing engine efficiency, reducing fuel consumption and pollution. One way to achieve both objectives is the conversion of engine waste heat to a more useful form of energy, either mechanical or electrical. This paper study a system prototype based on Brayton´s thermodynamic cycle driving an Electrical Generator to recover energy from the exhaust gases from a commercial internal combustion engine. read more... read less...
Keywords: Exhaust Gas Recovery, Turbocharging, Brayton Cycle Efficiency.
Development of a Battery System for an Electric Quarter of Vehicle
IJTEE, volume-16, Issue 1 (2020) , PP 47 - 50
Published: 07 Aug 2020
DOI: 10.5383/ijtee.16.01.006
by Domingo Martinez-Cevada, Jaime Zazueta-DeDoig, Carlos Gloria-Steele, Jorge de-J. Lozoya-Santos, Adriana Vargas-Martínez from Universidad de Monterrey, San Pedro Garza García, México
Abstract: The Battery System (BS) of an Electric Quarter of Vehicle (EQoV) it is an actual unresolved challenge in the electric vehicle industry. This paper proposes and develops de BS for an electric vehicle. The EQoV test rig will be used for noise and vibration analysis in a vehicle using with an in- wheel motor configuration. The power supply for this kind of configuration represents a primary problem for the EQoV and its real-life application in a complete electric vehicle. For the development of this system, it was necessary to deal with space limitations, the design of an electrical circuit, as well as with technical and functional specifications read more... read less...
Keywords: Electric Quarter of Vehicle, EQoV, Electric Vehicle, Battery System.
High Resolution Wind Power and Wind Drought Models
IJTEE, volume-16, Issue 1 (2020) , PP 27 - 36
Published: 07 Aug 2020
DOI: 10.5383/ijtee.16.01.004
by Paula Carroll, Lucy Cradden, Mícheál Ó hÉigeartaigh from Centre for Business Analytics, University College Dublin, Dublin, Ireland Energy Institute, University College Dublin, Dublin, Ireland School of Earth Sciences, University College Dublin, Dublin, Ireland
Abstract: We present high resolution wind power statistical models fitted to meteorological data for the island of Ireland. We find that a discrete Burr model efficiently represents the number of consecutive hours of wind power availability. Burr models are also useful to model the complement of the wind power availability events, wind droughts, when wind speed is insufficient to produce wind power. The models developed in this study may be most useful at time resolutions less than6 hours to capture zero power and short bursts of wind power potential. They could serve as a useful complement to other wind power modelling approaches such as MERRA reanalysis models. Wind power duration models, and their wind drought complements, also provide insights for investors on potential wind power availability at geographic locations. read more... read less...
Keywords: Wind Power Model, Wind Drought Model, Discrete Count Model, Wind Energy Resource
Redesign, Development and Construction of Powered Burner Head
IJTEE, volume-16, Issue 1 (2020) , PP 11 - 17
Published: 07 Aug 2020
DOI: 10.5383/ijtee.16.01.002
by Hosni I. Abu-Mulaweh, Donald W. Mueller from Purdue University Fort Wayne, Fort Wayne, IN 46805, USA
Abstract: This paper presents the redesign of a burner mixing head that used on High Static Gas burner (HSG) product to mix the gas and air mixture before it is ignited. This burner operates in firing range of 60,000-400,000 Btu/hr. The objective of redesigning the burner mixing head is to improve the overall performance of the HSG burner. This design project deals with the mixing head of a powered gas burner utilizing both natural and propane gases. The mixing head’s function in a powered gas burner is to initiate the fuel gas into an air stream. The redesigned burner mixing head increases combustion efficiency by 3% compared to the original burner head. This new burner mixing head operates within a wider range of excess air of 5% on both the lean and rich side while still igniting reliably and keeping the CO levels under 400 ppm. The redesigned burner mixing head design meets all the criteria of the American National Standards Institute ANSI Z21.17 standard for domestic gas conversion burners. The redesigned burner mixing head was machined out of 304 stainless steel which makes the burner head have corrosion resistant properties this includes using corrosion resistant fasteners. read more... read less...
Keywords: Burner Head, Design, Combustion
Water-Based Nanofluids for Natural Convection Cooling of a Pair of Symmetrical Heated Blocks Placed Inside a Rectangular Enclosure of Aspect Ratio Two
IJTEE, volume-16, Issue 1 (2020) , PP 1 - 10
Published: 07 Aug 2020
DOI: 10.5383/ijtee.16.01.001
by Afifa Riahi, Nader Ben–Cheikh, Antonio Campo from Physics Department, Faculty of Sciences of Tunis, University of Tunis El-Manar, 2092 El-Manar II, Tunis, Tunisia b Mechanical Engineering Department, The University of Vermont, Burlington, VT 05405, USA
Abstract: Fluid flow structures and heat transfer rates in a rectangular enclosure of aspect ratio of two containing two heated cylindrical blocks and filled with various water-based nanofluids is investigated. The free space between the cylindrical blocks and the enclosure walls is filled with four nanofluids: Cu-water, Ag-water, Al2O3-water and TiO2-water. The controlling parameters to be considered are: the Rayleigh number 3 6 10 Ra 10 , the solid volume fraction of the nanoparticles 0 0.06 , the inclination angle 0 180 . A numerical methodology based on the finite volume method, united to a full multigrid acceleration is utilized for solving the coupled system of conservation equations under the Boussinesq platform. The numerical results are presented in tabular and graphical forms to elucidate the role played by the parameters on the complex nanofluid flows and the heat transfer characteristics. In general, it is found that there is heat transfer enhancement with water-based nanofluids. It is more pronounced at combinations of high volume fractions and low Rayleigh numbers. The collection of results suggests that the best heat transfer enhancement can be obtained by using Cu–water nanofluids at moderate solid volume fractions around 0.04 . Additionally, the inclination angle can be used as a control parameter for rectangular enclosures housing two equal heated blocks which are cooled with waterbased nanofluids. read more... read less...
Keywords: Water-based nanofluids, natural convection, two heated blocks, rectangular enclosure, aspect ratio of two, heat transfer enhancement