Thermal and Energy Performance Analysis of a Locally Designed Optimised Roasting Oven | Chapter 2 | Physical Science: New Insights and Developments Vol. 3

 

In many developing countries, biomass is the main source of energy used for cooking. In Burkina Faso, 90.1% of households use solid fuels (wood and wood products) as their main source of cooking energy, and this situation is not expected to change significantly in the coming decades. This high degree of dependence has a negative impact on forest resources. The present work concerns an experimental study of the energy performance of a prototype optimised oven developed by local craftsmen. The Water Boiling Technique (WBT) is the method used to evaluate the energy efficiency of the oven. The temperatures of the oven’s walls and the ambient temperature were measured to evaluate energy losses by convection into the environment. The oven's heat balance was used to determine the amount of energy lost through the smoke. The energy generated by combustion (QB) is calculated by taking a mass balance of the fuel (wood or butane gas, depending on the oven) before and after each experiment to obtain the mass of fuel consumed (Mc). The results showed that a large amount of thermal energy is lost through the smoke (50% of the energy generated by gas combustion). Losses through the walls were reduced to 8%. The oven's efficiency reached 42%. This is in line with the standard efficiency of optimised gas ovens (between 40 and 50%). External wall temperatures remain below 60°C, ensuring user safety and improved thermal comfort. The results show the need to optimise the oven by conducting work to reduce heat losses through smoke.

 

 

Author(s) Details

David NAMOANO
Université Joseph KI ZERBO, Laboratoire d’Energies Thermiques et Renouvelables (LETRE), Ouagadougou, Burkina Faso.

 

Wilfried Rimnogdo OUEDRAOGO
Centre National de Recherche Scientifiques et Technologies, Département Energie, Institut de Recherche en Sciences Appliquées et Technologies (IRSAT), Ouagadougou, Burkina Faso.

 

Christian Djidjoho AKOWANOU
Laboratoire des Sciences de l’Ingénieur et de Mathématiques Appliquées (LSIMA), Université Nationale des Sciences, Technologies, Ingénierie et Mathématiques (UNSTIM), Abomey, Bénin.

 

Ousmane OUEDRAOGO
Centre National de Recherche Scientifiques et Technologies, Département Energie, Institut de Recherche en Sciences Appliquées et Technologies (IRSAT), Ouagadougou, Burkina Faso.

 

Sara BAGRE
Centre National de Recherche Scientifiques et Technologies, Département Energie, Institut de Recherche en Sciences Appliquées et Technologies (IRSAT), Ouagadougou, Burkina Faso.

 

Serge Wendsida IGO
Centre National de Recherche Scientifiques et Technologies, Département Energie, Institut de Recherche en Sciences Appliquées et Technologies (IRSAT), Ouagadougou, Burkina Faso.

 

Please see the link:- https://doi.org/10.9734/bpi/psniad/v3/6498

Thermal Performance Analysis of a Linear Fresnel Solar Thermal Collector System | Chapter 2 | Current Approaches in Engineering Research and Technology Vol. 9

Linear Fresnel solar collector is a line-focusing concentrator suitable for direct steam generation, industrial process heat applications, solar space cooling systems, and hot water generation for different uses. Experimental and numerical studies on the thermal performance of linear Fresnel solar collectors were reviewed. The advantages of a linear Fresnel solar collector over the parabolic trough solar collector were highlighted. The studies indicated that the thermal losses from the receiver cavity of a linear Fresnel solar collector are dominated by radiation followed by convection and conduction losses and these losses drastically reduced the thermal efficiency of the collector system. The studies also indicated that the thermal performance of the collector is influenced by the transmissivity of the glass pane, reflectivity, emissivity, and wall insulation of the receiver cavity. Thermal modeling of the collector system was based on steady-state uniform solar flux assumptions, rather than non-uniform solar flux boundary as indicated in the ray-tracing studies. Transient modeling for non-uniform solar flux boundary and heat flow in the receiver cavity is lacking in the literature. Studies are lacking on asymmetrical non-uniform solar flux distribution boundaries in terms of gravity. The studies also indicated that the thermal performance of a linear Fresnel solar collector still requires significant improvement by improving its thermal design models and heat transfer characteristics of its receiver system.

 

Author (s) Details

 

Okafor I. F.
National Centre for Energy Research and Development, University of Nigeria Nsukka, Enugu State, Nigeria, Department of Mechanical Engineering University of Nigeria Nsukka, Enugu State, Nigeria and African Center of Excellence Sustainable Power and Energy Development, University of Nigeria. Nsukka, Enugu State, Nigeria.

 

Okeke I. D.
National Centre for Energy Research and Development, University of Nigeria Nsukka, Enugu State, Nigeria and Department of Mechatronic Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria.

 

Please see the book here:- https://doi.org/10.9734/bpi/caert/v9/2002

Use of MADM Techniques for Optimization of Thermal Performance of Ranque Hilsch Vortex Tube | Chapter 4 | Research and Developments in Engineering Research Vol. 3

 In the study MADM methods are secondhand for optimization of concerning manipulation of numbers combinations. The whirlpool tube is very natural thermo-fluidic machinery which produce low hotness and high temperature air streams. The basin fluid is tangentially compressed into the fjord nozzles of vortex hose. Thermal performance of whirlpool tube is remarkably influenced by allure geometrical and functional parameters. In this study effect of miscellaneous geometrical (L/D percentage: 15, 16, 17, 18; exit valve angle; ; cold end opening diameter: 5,6 and , hose divergence angle: ) and functional parameters (fjord pressure: 2 to 6 bars) on the performance of whirlpool tube have existed investigated tentatively. The best configuration of the whirlpool tube is preferred using Multiple Attribute Decision Making (MADM) methods. COP for cooling and the ideal hotness difference on the cold end were used to analyse the whirlpool tube's depiction. The WSM (Weighted Sum Method), WPM (Weighted Power Method), TOPSIS (Technique for Order Preference by Similarity to Ideal Solution), and AHP (Analytical Hierarchy Process) MADM (Multiple Attribute Decision Making) methods are secondhand. Experimental best performing mixtures are obtained for Length to Diameter percentages  with exit valve angle as  and  at opening diameter  for basin pressure of 5 and 6 bar pressure. Best COP, efficiency and cold end hotness difference are  and  individually for the combination of 15  spigot angle,  orifice width and 2 bar pressure by MADM techniques.

Author(s) Details:

K. D. Devade,
India College of Engineering and Management, Pune-410506, India.

A. T. Pise,
DTE, Mumbai, Maharashtra-400001, India.

Please see the link here: https://stm.bookpi.org/RADER-V3/article/view/10508

Study on Enhancement of Thermal Performance of Absorber Flat Plate Solar Collector| Chapter 4 | Research Developments in Science and Technology Vol. 2

The major goal of this project is to enhance the heat transfer rate by altering the design of the absorber flat plate and to compare the findings of computer-assisted fluid dynamics simulation for all configurations. To optimise temperature distribution and heat generation, as well as factors such as axial and radial speed, pressure distribution, and thermal performance, fluid dynamics simulations were done for six flat plate vacuum absorbent designs. In terms of maximum temperature and thermal power, the interpreted design-3 is 15.339 percent more efficient than the basic design, with an increase of 8.14 percent above the basic design. Design 3 of the flat absorbent plate is recommended for the best heating results. For six types of absorber plate for evacuated flat plate collectors, the temperature distribution and heat generation were verified and compared using computational fluid dynamics analysis for better thermal performance.

 

Author(s) Details:

Amrit Ranjan,
Department of Mechanical Engineering, Radharaman Institute of Technology & Science, Bhopal, Madhya Pradesh, India.

Please see the link here: https://stm.bookpi.org/RDST-V2/article/view/6606

Innovative Solutions and Performance Assessment of Green Roofs - Materials, Technology Aspects and Building Passive Cooling | Book Publisher International

The Monograph investigates several green roof layouts by altering the materials utilised, with the goal of proposing a novel technological solution. Furthermore, this Monograph intends to advance scientific understanding of building passive cooling, which is one of the primary advantages of green roofs. To begin, a thorough bibliographical examination of the technological aspects of green roofs was conducted. Even in the case of building retrofitting, the numerical analysis required comparing the performance of several commercial solutions in order to select those with the best energy efficiency. Two experimental setups have been built and installed based on scientific literature and numerical analysis results. The first, at the University of Catania, was designed to test the thermal performance of an innovative technology that used polyethylene granules derived from the recycling of agricultural film as a drainage material. The second, constructed at the University of Lleida in Spain, with the goal of determining the passive cooling of a green roof due to evapotranspirative phenomena, altering the irrigation regime, and linking it to both energy performance and microclimatic conditions.

Author (s) Details

Stefano Cascone
Department of Architecture and Territory, Mediterranea University of Reggio Calabria, Via Salita Melissari, 89124 Reggio Calabria RC, Italy.

View Book :- https://stm.bookpi.org/ISPAGRMTABPC/article/view/6456

The Influence of Wind Velocity and Wind Distribution on the Double Skin Façades with Different Width Corridors in DSF Cavities | Chapter 1 | New Ideas Concerning Science and Technology Vol. 13

The building facade is critical to achieving thermal comfort and energy conservation. A Double Skin Facade (DSF) is a two-layer envelope system with an external and internal layer that contains a buffer space for controlled ventilation and solar protection. Transparency and the use of glass have become appealing facade options in architectural design as a result of technological advances. Glass facades on buildings can provide outdoor views, an abundance of natural light, and the potential for natural ventilation. Double skin façades (DSF) are architectural elements that are becoming more popular in modern buildings. They were created as an alternative technology.to improve the thermal performance of conventional fully glazed buildings. Also they have been widely used as a way to reduce the thermal instability of inner spaces caused by the growing use of large glazed areas in buildings. This concept has provided the possibility of improved sound insulation, preheating air for ventilation, and protection of solar shading in urban areas. DSF’s can achieve reduction of winter heating requirements. However, when the building is under summer conditions or located in moderate or hot climates, heat gains are predominant and the cost of cooling becomes a major issue. The improvement of the system is necessary when working under hot climatic conditions.This is especially true when the façade must function in either extreme or moderate summer conditions. The thermal overheating characteristics of a specific type of DSF in various configurations, as well as their practical control, have not been subjected to systematic experimental and computational investigations. Previous research suggested that using ventilated facades contributes to energy savings from indoor thermal gains. The use of a ventilated channel lowers temperatures in the facade, but indoor thermal conditions must be evaluated in relation to this.as part of the system's compliance with building requirements, to the facade configuration The majority of the research on a facade and energy-comfort modeling combination is limited to a single DSF typology. This study attempts to assess the indoor thermal comfort of a mechanically ventilated building with a DSF configuration. The purpose of this research is to determine the effect of wind velocity and wind distribution on mechanically ventilated buildings with DSF configurations, in order to determine whether a DSF configuration will provide better thermal comfort through natural ventilation. Another goal of this research is to look into the performance of a new DSF configuration for a -as part of the system's compliance with building requirements, to the facade configuration The majority of the research on a facade and energy-comfort modeling combination is limited to a single DSF typology. This study attempts to assess the indoor thermal comfort of a mechanically ventilated building with a DSF configuration. The purpose of this research is to determine the effect of wind velocity and wind distribution on mechanically ventilated buildings with DSF configurations, in order to determine whether a DSF configuration will provide better thermal comfort through natural ventilation. Another goal of this research is to look into the performance of a new DSF configuration for a -The thermal comfort statuses of different width corridors with double skin facades were analyzed using the CFD program in this study. To investigate the thermal comfort inside the building, the thermal comfort indices, PMV and PPD values, were calculated in both FloEFD and Design Builder.

Author (S) Details

Assoc. Prof.Dr.EnesYasa

Department of Int. Architecture, Faculty of Architecture, Istanbul University, Beyazid, Fatih, Istanbul, Turkey.

View Book :-https://stm.bookpi.org/NICST-V13/article/view/1762