VOLUME 1 ISSUE 4
IJATSER Volume 1 – Issue 4, March 2016 Edition
All listed papers are published after full consent of respective author or co-author(s).
For any discussion on research subject or research matter, the reader should directly contact to undersigned authors.
01-MAR16 REVIEW PAPER ON OPTIMUM ENERGY IN VAPOUR ABSORPTION REFRIGERATION SYSTEM(Page No. 1-6)
AUTHORS : Shivendra Singh, Satish Singh
ABSTRACT: This paper presents an experimental investigation on the performance of a small size absorption chiller which was renovated or developed from an old out-of-order commercial chiller. Its working fluid and controller circuit was replaced with the new one. The main objectives of this study are to gain the experience and know how to build the absorption chiller. The performance of this developed chiller was investigated under the local weather condition and the concentration of strong solution of 59% was used in this study. The experimental results show that the developed chiller can be operated at about 75% of nominal capacity and this cooling capacity satisfies the cooling load of the current conditioning room. The study results also demonstrate that, to obtain the high coefficient of performance, this chiller should be operated at 85 0C of hot water temperature supplied to the generator. In last decades, much effort has been made to drive cooling cycles exploiting renewable energy sources. The use of solar energy is one of the most attractive solutions especially for air conditioning, as availability of solar radiation and cooling loads are approximately in phase. Solar cooling based on water-lithium bromide absorption chillers is the most promising technology for low-medium temperature heat sources (80-100°C). Small (15-40 kW cooling capacity), medium (50-250 kW) and large scale (up to tens of MW) units are currently at commercial stage.
02-MAR16 REVIEW PAPER ON OPTIMUM ENERGY IN AIR CONDITIONING SYSTEM(Page No. 7-11)
AUTHORS : Prince singh , Satish Singh
ABSTRACT – To achieve a beautiful appearance, the outdoor machine of a residential air conditioning system is often placed in a groove and shield with a louver. This paper presents split air conditioner outdoor machine in the semi closed space within the optimal Locations and louver form. This study is based on the enthalpy difference laboratory platform, to evaluate an outdoor unit installation and lover form effect on air-conditioning energy and EER. The results show that the condenser should be more than 80mm away from the walls; The EER increased with increasing distance and the optimal distance away from the fan louver was approximately 300mm. The heat dissipation effects of the air conditioner were better with greater louver spacing. The optimal louver angle was approximately 30 ° when the outdoor wind comes from the lateral direction. The air-conditioning efficiency was much higher than when the wind came from the front. Therefore, the outdoor unit and the local dominant wind direction should be presented to the lateral wind.
03-MAR16 Implementation of 64 Bit Decimal Floating Point Adder/Subtractor on FPGA(Page No. 12-17)
AUTHORS : Dharmendra Dhaker
ABSTRACT: In this paper we explain the FPGA implementation of a decimal Floating Point (DFP) adder/subtractor. The modal performs addition and subtraction on 64-bit operands that use the IEEE 754- 2008 decimal encoding of DFP numbers and this design is based upon a fully pipelined circuit. The design represents hardware for pre-signal generation stage and an enhanced version of previously published leading zero stage. The design can operate at a frequency of 200 MHZ on a Virtex-5 with a latency of 8 cycles. The given DFP adder/subtractor performs operations on the decimal 64 format and it is also easily extendable for the decimal 128 format. In my knowledge, this is the first hardware FPGA design for adding and subtracting IEEE 754-2008 using decimal 64 encoding.
04-MAR16 Grid-Connection Control and simulation of PMSG Wing Power system based on Three Level Converter(Page No 18-24)
AUTHORS : SHILPI JAIN, DR. PALLAVI BONDRIYA
ABSTRACT: This work is analyzing the operation of a wind turbine system with grid side control with variable speed Permanent Magnet Synchronous Generator (PMSG) and load variations. Wind turbine mechanical power transmission mechanism is designed and implemented for smooth power transmission to the synchronous generator. Initially, the holistic model of the entire system is achieved, including the PMSG, 3-phase rectifier, dc-dc boost converter and 3- phase inverter. Wind has been recognized and considered as one of major conventional, realistic
clean energy sources for power generation to achieve the continuously increased energy demand and to protect our environment possibly. The utilization of wind energy encounters inevitable challenges to design adaptive and intelligent control systems according to the nature of wind intermittency. Power can be effectively delivered and supplied by the proposed wind based electrical power generation system and, subject to an optimal grid side control method. The constant DC power is be ensured and the working state of the inverter can be maintained in a unity power factor state as the reactive power is near to zero. The control system is implemented and performed. Furthermore, the results confirm the validity of the supply. The proposed model is designed using MATLAB/SIMULINK simulation to investigate the faithfulness of the system.
Key Words: Permanent Magnet Synchronous Generator (PMSG), Power Quality, voltage source inverter (VSI), pulse width modulation (PWM), total harmonic distortion (THD), point of common coupling (PCC), Boost Converter, PI Controller, Phase Locked Loop(PLL).
05-MAR16 INVESTIGATION OF IMPACT OF MODERN FACTS CONTROLLERS ON POWER SYSTEM PERFORMANCE (Page No. 25-32)
AUTHORS : Mr Vivek kumar koshta, Mr Uditveer singh
ABSTRACT: In this paper study of different generation FACTS devices have done and investigation being done to know the impact of different FACTS devices and there utilization for different conditions in power systems. A detailed over view on the compensation methods are also done to understand series, shunt topologies and combined topology, to realize the different arrangement of FACTS controller in power system. At the end modern DFACTS devices and there study is done.
06-MAR16 A REVIEW PAPER ON DUPLEX STAINLESS STEEL (Page No. 33-38)
AUTHORS : Roopesh Sinha , Nitin chandekar
ABSTRACT : The present study is to optimize the process parameters for friction welding of duplex stainless steel (DSS UNS S32205). Experiments were conducted according to central composite design. Process variables, as inputs of the neural network, included friction pressure, upsetting pressure, speed and burn-off length. Tensile strength and micro hardness were selected as the outputs of the neural networks. The weld metals had higher hardness and tensile strength than the base material due to grain refinement which caused failures away from the joint interface during tensile testing. Due to shorter heating time, no secondary
phase intermetallic precipitation was observed in the weld joint. A multi-layer perceptron neural network was established for modeling purpose. Five various training algorithms, belonging to three classes, namely gradient descent, genetic algorithm and Ellenberger Marquardt, were used to train artificial neural network. The optimization was carried out by using particle swarm optimization method. Confirmation test was carried out by setting the optimized parameters. In conformation test, maximum tensile strength and maximum hardness obtained are 822 MPa and 322 Hv, respectively. The metallurgical investigations revealed that base metal, partially deformed zone and weld zone maintain austenite.
07-MAR16 A REVIEW PAPER ON WELD ABILITY 304 AUSTENITIC STAINLESS STEEL (Page No. 39-45)
AUTHORS : Roopesh Sinha , Nitin chandekar
ABSTRACT : Austenitic stainless steels are generally known to have very good laser weldability, when ordinary grades of sheets are concerned. But it is not necessarily the case, if special grades of fully austenitic structures with e.g. high molybdenum, or thick-section are used. It is also known that hot cracking susceptibility is strictly controlled by composition and welding parameters. If solidification is primary ferritic, hot cracking resistance is dramatically increased. It is also well known that laser welding needs a careful control of weld edge preparation and air gap between the edges. The dependence on edge quality can be decreased by using filler metal, either cold wire, hot wire or hybrid laser-arc welding. An additional role is high molybdenum contents where micro segregation can cause low local contents in weld which can decrease the corrosion properties, if filler metal is not used. Another feature in laser welding is its incomplete mixing, especially in thick section applications. It causes in homogeneity, which can make uneven microstructure, as well as uneven mechanical and corrosion properties
In this presentation the features of laser welding of thick section austenitic stainless steels are highlighted. Thick section (up to 60 mm) can be made by multi-pass laser or laser hybrid welding. In addition to using filler metal, it requires careful joint figure planning, laser head planning, weld parameter planning, weld filler metal selection, non-destructive and destructive testing and metallographic to guarantee high quality welds in practice. In addition some tests with micro segregation is presented. Also some examples of incomplete mixing is presented.
08-MAR16 EFFECT OF STEAM INLET TEMPERATURE ON
PERFORMANCE OF STEAM TURBINE (Page No. 46-53)
AUTHORS : Rahul Kumar Singh , Anand Kumar
ABSTRACT : Traditionally, the first stage is of impulse design, i.e. the entire pressure drop for the stage is realized across the stator row. This leaves only a small circumferential pressure gradient after the stator so the spreading of the jets circumferentially may be attenuated. At present 54.09% or 93918.38 MW (Data Source CEA, as on 31/03/2011) of total electricity production in India is from Coal Based Thermal Power Station. A coal based thermal power plant converts the chemical energy of the coal into electrical energy. This is achieved by raising the steam in the boilers, expanding it through the turbine and coupling the turbines to the generators which converts mechanical energy into electrical energy. A power station is an industrial facility for the generation of electric power. At the center of nearly all power stations is a generator, a rotating machine that converts mechanical power into electrical power by creating relative motion between a magnetic field and a conductor. The energy source harnessed to turn the generator varies widely. It depends chiefly on which fuels are easily available, cheap enough and on the types of technology that the power company has access to. Most power stations in the world burn
fossil fuels such as coal, oil, and natural gas to generate electricity, and some use nuclear power, but there is an increasing use of cleaner renewable sources such as solar, wind, wave and hydroelectric. Central power stations produce AC power, after a brief Battle of Currents in the 19th century demonstrated the advantages of AC distribution.