Experimental Investigation

The objective of the project is to design a new blade mechanism to reduce the blade damage caused due to high wind speeds during operation of the wind turbine. There has been a very sturdy increase in harnessing wind energy all over the world. In today's world there are many types of turbines which are used for harnessing the wind energy. One such type is the savonius wind turbine which we have concentrated on in this project. This is a vertical axis wind turbine (VAWT). There are two type of mechanisms used in a VAWT to convert the wind energy to mechanical energy.They are lift type and the drag type. Savonius turbine is a drag type wind turbine which uses the drag force created by the wind on the turbine blades to rotate the blades over the axis of the turbine. Due to high wind speeds during various climatic conditions the blades of the turbines are damaged and hence reduces the efficiency of the blades. They are also expensive to repair. Hence we have come up with a new speed limiting mechanism to safe guard the blades from getting damaged. Research in this area will contribute in overcoming the disadvantages of the technology and move towards a more viable technology for mass use. They are very compact against the horizontal wind turbines. They can coexist with the existing infrastructure without high cost. I. INTRODUCTION Wind Energy has become significant part of the worlds overall power grid. Having a lot of advantages over the traditional non renewable source of energy. Technology to harness this form of energy has been there for a very long time. In the earlier days it was in the form of windmills which converts the wind energy to mechanical work which are used to pump water etc. whereas now the technology has evolved and we are able convert the mechanical energy and store it as electrical energy in batteries and use it for various applications by the use of wind turbines. Now this technology has the capability of contributing to the country's power requirement. There are two kinds of wind turbines based on design, they are horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT).The advantages of vertical axis turbine are that they are easy to design and construct, lower cost to build, they don't need a rotor yaw mechanism as they can operate in any direction of the wind and ecosystem damage is less. The disadvantage of this type of wind turbine is that its efficiency is less, high fluctuations in power production, lower blade speeds and lower energy yield. Due to population growth there has been a steep increase in the energy needs in the world. Since in the advancement of science the average power consumption per house has also been increased due to the increase in electronic goods. Due to all this all the countries are looking for a renewable energy source to balance the needs and the non renewable energy source is depleting in a very fast pace and environment damage it causes has been significant. To counter all this there is a need to reduce our dependence on nonrenewable source of energy This project determines the optimal size for a wind turbine to supplement power requirement to light at least a bulb.

In this experiment the beams and cubes were cast by adding fibre in green cement concrete and ordinary conventional concrete. Green cement from bagasse ash is used to reduce the CO2 emission in the concrete. The project work deals with the comparative study on compressive strength and flexural strength of hybrid fibres reinforced green cement concrete and hybrid fibres reinforced opc concrete. Plain concrete possess a very low tensile strength, limited ductility and little resistance to cracking. So, the development of such micro cracks is the main cause of inelastic deformation in concrete. It has been recognized the addition of small, closely spaced and uniformly dispersed fiber to concrete would act as crack arrester and would substantially improve static and dynamic properties. Hybrid fibers such as coir and steel wires are used to increase the tensile strength in OPC and green cement concrete in this project. Two different percentages 0.5% and 1% are taken as volume based such as coir fibres and steel fibres were added to the concrete M 25 grade. The compression test and flexural test were conducted on cubes and beams and their results were compared and reported.

This thesis manipulates an important engineering subject both computationally and experimentally. This subject is the characteristics of the wind loads acting on uncommon tall buildings to determine the position of maximum local load on the building. Also, the investigation is extended to study the characteristics of wind loads on two interfering buildings.

This paper presents the details of an experimental and numerical investigation of natural convection in a radial heat sink, composed of a horizontal circular base and curved fins mounted on it and flux input will be examined. Using the experimental data and some basic simulation we will validate our model. The general flow pattern is that of chimney; i.e., cooler air entering from outside is heated as it passes between the fins, then rises from the inner region of heat sink. Parametric studies will be performed to compare the effects of on two parametric geometric (no. of fins and height of fins). This is a crucial aspect in what concerns the expected lifetime of the LED lamp and should be achieved at the expense of as low as possible aluminium mass. The objective is to achieve a maximum core temperature of 70 degree C keeping the heat sink total mass and occupied volume contained.

The ongoing growth in data center rack power density leads to an increased capability for waste heat recovery. Recent studies revealed the organic Rankine cycle (ORC) as a viable means for data center waste heat recovery since the ORC uses waste heat to generate on-site, low-cost electricity, which can produce economic benefits by reducing the overall data center power consumption. This paper describes the first experimental and theoretical study of a lab-scale ORC designed for ultralow grade (40-85 C) waste heat conditions typical of a data center server rack, and it outlines the implementation of a similar ORC system for a data center. The experimental results show thermal efficiencies ranging from 1.9% at 43 C to 4.6% at 81 C. The largest contributors to ORC exergy destruction are the evaporator and condenser due to large fluid temperature differences in the heat exchangers. The average isentropic efficiency of the expander is 70%. A second-law analysis estimates a reduction of 4-8% in data center power requirements when ORC power is fed back into the servers at a waste heat temperature of 90 C. The data from the lab-scale experiment, when complemented by the thermodynamic model, provide the necessary first step toward advancing this type of waste heat recovery for data centers (DCs).