Mechanical Engineering

Wind energy as a power source is attractive as an alternative to fossil fuels, because it is plentiful, renewable, widely distributed, green, and produces no greenhouse-gas emissions. A performance improvement of the scoop-vane vertical axis wind turbine is described. To improve the performance of the power generation system design of special frame of vertical axis wind turbine which consists of three movable vanes, this uses more effectively the wind energy and depends only on the acting area of the movable vanes. The frame of the wind turbine is designed to increase the drag coefficient. The new frame design makes using the kinetic energy of the wind to increase the positive torque of our model and tested it practically in wind tunnel as well as tested by solid works software. This model shows batter performance in terms of high drag coefficient and increase torque per frame in the direction of wind.

This work designs the rotor wind turbine, which uses more effectively for the wind energy and depends on the acting area of the vanes. The frame design consists of three movable vanes to reduce the negative torque of the frame that rotates contrary to the wind. The wind tunnel is used to measure the power coefficient, torque coefficient and angular velocity as a function of wind velocity. The power coefficient is measured experimentally to be equals to 18% and 21% for three and four frames, respectively. The rotor wind turbine is applicable internationally due to its high efficiency, simple construction, and simple technology.

The present paper identifies the critical success factors while the implementation of TQM, to evaluate their impact on the primary measures as expressed by the operational performance and the secondary measures as organizational performance, and to find out the effect of the operational and organizational performance of small and medium-sized enterprises (SMEs) in a selected industrial sector using the semi structured interview approach. A total 297 samples are identified for analysis. 139 responses received with all detail. Respondent’s profiles are quality managers and deferent sectors are targeted. A focus is needed on analyzing various techniques and strategies to be adopted by the Indian companies.

Geothermal heat pumps (GSHPs), or direct expansion (DX) ground source heat pumps, are a highly efficient renewable energy technology, which uses the earth, groundwater or surface water as a heat source when operating in heating mode or as a heat sink when operating in a cooling mode. It is receiving increasing interest because of its potential to reduce primary energy consumption and thus reduce emissions of the greenhouse gases (GHGs). The main concept of this technology is that it utilises the lower temperature of the ground (approximately <32°C), which remains relatively stable throughout the year, to provide space heating, cooling and domestic hot water inside the building area. The main goal of this study is to stimulate the uptake of the GSHPs. Recent attempts to stimulate alternative energy sources for heating and cooling of buildings has emphasised the utilisation of the ambient energy from ground source and other renewable energy sources. The purpose of this study, however, is to examine the means of reduction of energy consumption in buildings, identify GSHPs as an environmental friendly technology able to provide efficient utilisation of energy in the buildings sector, promote using GSHPs applications as an optimum means of heating and cooling, and to present typical applications and recent advances of the DX GSHPs. The study highlighted the potential energy saving that could be achieved through the use of ground energy sources. It also focuses on the optimisation and improvement of the operation conditions of the heat cycle and performance of the DX GSHP. It is concluded that the direct expansion of the GSHP, combined with the ground heat exchanger in foundation piles and the seasonal thermal energy storage from solar thermal collectors, is extendable to more comprehensive applications.

Over the years, all parts of a commercial refrigerator, such as the compressor, heat exchangers, refrigerant, and packaging, have been improved considerably due to the extensive research and development efforts carried out by academia and industry. However, the achieved and anticipated improvement in conventional refrigeration technology are incremental since this technology is already nearing its fundamentals limit of energy efficiency is described is ‘magnetic refrigeration’ which is an evolving cooling technology. The word ‘green’ designates more than a colour. It is a way of life, one that is becoming more and more common throughout the world. An interesting topic on ‘sustainable technologies for a greener world’ details about what each technology is and how it achieves green goals. Recently, conventional chillers using absorption technology consume energy for hot water generator but absorption chillers carry no energy saving. With the aim of providing a single point solution for this dual purpose application, a product is launched but can provide simultaneous chilling and heating using its vapour absorption technology with 40% saving in heating energy. Using energy efficiency and managing customer energy use has become an integral and valuable exercise. The reason for this is green technology helps to sustain life on earth. This not only applies to humans but to plants, animals and the rest of the ecosystem. Energy prices and consumption will always be on an upward trajectory. In fact, energy costs have steadily risen over last decade and are expected to carry on doing so as consumption grows. This article discusses the potential for such integrated systems in the stationary and portable power market in response to the critical need for a cleaner energy technology for communities. Throughout the theme several issues relating to renewable energies, environment and sustainable development are examined from both current and future perspectives.

This work was carried out in order to optimize the friction phase parameters, of friction welding of M2 high speed steel, to AISI 1040 medium carbon steel, namely; rotational speed, friction pressure and friction time. The experiments were designed as per Taguchi method. The optimization of the experimentally obtained results was carried out by trying three mathematical models, namely; a multiple linear regression model without interaction effect, a multiple linear regression model with interactions effect, and a second-order polynomial regression model. The three models were evaluated using the experimental data, the coefficient of multiple determination R2, and Standard error of the regression (S), were used as the evaluation criteria of the models. The polynomial model was chosen, and optimized using a Genetic Algorithm. The optimal value of the joint strength of 411 MPa was obtained at the highest value of the time ( 44.9 sec.) and the pressure of 112 MPs and the speed of 1349 r.p.m.

The experiment was conducted to evaluate the effect of cutting angle for locally assembly motorized vibration cutter on some operational characteristic used for date palm frond cutting. An implement was fabricated to cut the fronds around the date palm tree trunk. Three cutting angles included 45,60 and 90° was used in this study .One frond cutting time, One palm frond cutting time, cutting level, noise level, vibration ,productivity and efficiency was measured in this experiment . Complete block design with three replications was used in this study. Least significant differences (L.S.D) under 0.05 level was used to compeer the mean of treatment.The results showed that 45° cutting angle gave a lower time in cutting one frond and one palm fronds stood 2.65 sec and 2.40 min respectively, also gave less differences in surface cutting level, level of noising and vibration stood 5.28 mm,79.37 db and 5.22 m.sec-2 respectively . Also it gave the same amount of productivity with 60° cutting angle stood 8.01 palm /h. 45° cutting angle gave a high efficiency it got 80.23%, using a manufacturing equipment for cutting date palm frond was successfully done.

The experiment was conducted for testing a locally assembled combine implement used for open furrow, planting and fertilizing under different machinery unit speeds. New Holland TD80 tractor was used in this study. Three machinery speeds included 6.26, 7.44 and 9.53 km?hr which represent main plot and two Furrow depths included 5-15 and 15-25 cm which represent sub plot were used in this study. Field efficiency, Leaf area, 100 seed weight, percentage of oil in maize and maize yield was measured in this experiment. Split plot design under Randomized Complete block design with three replication was used in this study. Least significant differences (L.S.D) under 0.05 level was used to compare the mean of treatment. The results can be summarized as Fallow: 9.53 km ? hr speed gave lower field efficiency stood 63.45% and higher maize yield stood 9.65 t ?h. 5 - 15 cm furrow depth gave higher field efficiency stood 69.01% and greater leaf area stood 0.57 m2 while 15-25 cm furrow depth gave higher maize yield stood 5.23 t ?h. The interaction between speed and furrow depth, has significant effect on all plant properties except 100 seed weight and percentage of oil in maize.Using the locally assembling combine implement for planting corn, fertilizing and open furrows is successfully done. 

Using a combine implement for open furrows , seeds planting and fertilization is very important implement to conduct more than one process or operation in one field pass at the same time where the combine equipment open suitable furrow to grow any crop and also considered as special tillage implement. The combine implements save time, cost and potential, and decrease traffics and, labors and improve soil physicals properties and plant yields. The experiment was conducted to evaluate the effect of deferent furrow depths and speeds of machinery unit using a locally assembled combine equipment on planting maize. The tractor which was used in this study is New Holland TD80. Two machinery speeds included 7.44 and 9.53 km?hr which represent main plot and two Furrow depths included 5-15 and 15-25 cm which represent sub plot were used in this study. Field efficiency, Leaf area, 300 seed weight, and maize yield were measured in this experiment. Split plot design under Randomized Complete block design with three replication was used in this stud . Least significant differences (L.S.D) under 0.05 level was used to compare the mean of treatment. The results can be summarized as Fallow; 9.53 km ? hr speed gave lower Field efficiency stood (63.45)% and higher maize yield stood (9.65) t ?h . 5 - 15 cm furrow depth gave higher Field efficiency stood (66.69)% and greater Leaf area stood (0.53) m2 while 15-25 cm furrow depth gave higher maize yield stood (5.53) t ?h. The interaction between the speed and furrow depth, has impacted significantly on all plant properties except 300 seed weight. Using the locally assembling combine implement for planting corn, fertilizing and open furrows is successfully done.

Groundwater resources are essential to maintain a stable water supply to growing cities for the efficient farming region and for domestic purpose. Due to simplicity of the techniques, the Vertical Electrical Sounding (VES) has proved very popular with groundwater prospecting and engineering investigations. The main objective of the investigation is to delineate the subsurface lithology and to assess the groundwater resources of the study area. It also aims to focus on the identification of fracture zone and its thickness by using VES method. The life of a button bit in bore well drilling depends mainly on hardness of rock. As the hardness varies at different locations, the reliability of the button bit also varies accordingly. In order to arrive at the reliability, the life of the button bit in terms of depth of drilling has to be obtained. This can be converted in terms of time from the known velocity of drilling. It is proposed to arrive at the drill bit reliability from the obtained failure rate.