National Institute of Technology Hamirpur

www.nith.ac.in
Hamirpur, India

The National Institute of Technology Hamirpur is a public engineering college located in Hamirpur, Himachal Pradesh, India. It is one of the thirty National Institutes of Technology established, administered and funded by Government of India. It conducts undergraduate and postgraduate programmes in Engineering and Architecture and Doctor of Philosophy programme in Engineering, Pure Science and Humanities. Wikipedia.


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Kumar D.,National Institute of Technology Hamirpur | Katoch S.S.,National Institute of Technology Hamirpur
Renewable and Sustainable Energy Reviews | Year: 2014

Any hydropower project whether mega, large or small is to be weighed for sustainability at the time of its inception. Without proper sustainability assessment, the project may face many problems during its construction or/and operational phase(s). Legally also, this aspect has been made mandatory in many countries across the globe to check the feasibility of the project from sustainability point of view beforehand. This study intends to emphasise sustainability of run of the river (RoR) hydropower projects in hydro rich regions of India where these types of projects are being undertaken on a large scale. In addition, this study has compiled a list of sustainability indicators which may be of use for policy makers and designers while planning RoR projects in hydro rich regions of India and similar regions throughout the world. © 2014 Elsevier Ltd. All rights reserved.


Kumar D.,National Institute of Technology Hamirpur | Katoch S.S.,National Institute of Technology Hamirpur
Renewable and Sustainable Energy Reviews | Year: 2014

Himalayan region is called the 'water tower of Asia'. This 'water tower' is now being harnessed into 'power tower' by many Himalayan countries (China, India, Nepal, Bhutan etc.) in the form of small and large hydropower projects. Himachal Pradesh, located in this region is known as 'power state' of India. The state has developed well framed policies and guidelines for growth of hydropower sector in the state. It has emerged as role model for identification, allotment and harnessing of small hydropower projects not only in India but in the whole Himalayan region. However, in the recent past, the growth of small hydropower projects is not as impressive as predicted. Local natural resources, ecology and livelihood of the local people are being destroyed in the garb of local development and false promises of employment. Benefits of this so called golden harvest are not being transferred to native people as envisaged. This article presents small hydropower development in a global, Indian and Himachal Pradesh perspective. It expresses in detail the current status, policy guidelines, challenges, initiatives taken by state, future scope and suggestions for smooth development of small hydropower projects in this beautiful, hydro rich hilly state of India. It is concluded that framing of policies favoring sustainable development and their effective implementation at grass-root level (involving all stakeholders) can only set the ball rolling for desired pace of small hydropower development in the state. Bringing of small hydropower projects in the ambit of environmental clearance process has also been advocated. © 2014 Elsevier Ltd.


Yadav A.K.,National Institute of Technology Hamirpur | Chandel S.S.,National Institute of Technology Hamirpur
Renewable and Sustainable Energy Reviews | Year: 2014

Solar radiation data plays an important role in solar energy research. These data are not available for location of interest due to absence of a meteorological station. Therefore, the solar radiation has to be predicted accurately for these locations using various solar radiation estimation models. The main objective of this study is to review Artificial Neural Network (ANN) based techniques in order to identify suitable methods available in the literature for solar radiation prediction and to identify research gaps. The study shows that Artificial Neural Network techniques predict solar radiation more accurately in comparison to conventional methods. The prediction accuracy of ANN models is found to be dependent on input parameter combinations, training algorithm and architecture configurations. Further research areas in ANN technique based methodologies are also identified in the present study. © 2013 Published by Elsevier Ltd.


Sinha S.,National Institute of Technology Hamirpur | Chandel S.S.,National Institute of Technology Hamirpur
Renewable and Sustainable Energy Reviews | Year: 2014

Hybrid energy systems are being utilized for supplying electrical energy in urban, rural and remote areas to overcome the intermittence of solar and wind resources. A hybrid renewable energy system incorporates two or more electricity generation options based on renewable energy or fossil fuel unit. The techno-economic analysis of the hybrid system is essential for the efficient utilization of renewable energy resources. Due to multiple generation systems, hybrid system analysis, is quite complex and requires to be analyzed thoroughly. This requires software tools for the design, analysis, optimization, and economic viability of the systems. In this paper, 19 softwares with their main features and current status are presented. The softwares studied are HOMER, Hybrid2, RETScreen, iHOGA, INSEL, TRNSYS, iGRHYSO, HYBRIDS, RAPSIM, SOMES, SOLSTOR, HySim, HybSim, IPSYS, HySys, Dymola/Modelica, ARES, SOLSIM, and HYBRID DESIGNER. The research work related to hybrid systems carried out using these softwares at different locations worldwide is also reviewed. The main objective of the paper is to provide the current status of these softwares to provide basic insight for a researcher to identify and utilize suitable tool for research and development studies of hybrid systems. The capabilities of different softwares are also highlighted. The limitations, availability and areas of further research have also been identified. © 2014 Elsevier Ltd.


Kumar R.,National Institute of Technology Hamirpur | Dhiman S.,National Institute of Technology Hamirpur
Materials and Design | Year: 2013

In this paper, an attempt has been made to investigate the specific wear rate of the unreinforced Al 7075 and hybrid aluminum metal matrix composite reinforced with the hard ceramic (7. wt.% of SiC) and soft solid lubricant (3. wt.% of graphite) fabricated by using stir casting method. The unlubricated pin-on-disc wear tests were conducted to examine the wear behavior of the aluminum alloy and its composites. The sliding wear tests were carried out at various loads (20-60. N), speeds (2-6. m/s), and sliding distances (2000-4000. m). It is inferred that specific wear rate of the hybrid composite is lower than that of the unreinforced Al 7075 in all combination of loads, sliding speeds, and sliding distances. The specific wear rate exhibited increasing trend with change of load. However, it is apparent from the result that specific wear rate decreases up to the speed of 4. m/s and then starts increasing. To recognize the mixing of reinforcement, worn surfaces and wear debris tested samples were examined using scanning electron microscope (SEM and EDX) and X-ray diffraction (XRD). Response Surface Methodology (RSM), which is a statistic method has been used to find out the most significant factor, which influence the specific wear rate. Consequently, it is concluded that load is most significant factor which leaves an effect on specific wear rate. Sliding speed and sliding distance provide the secondary contribution to the performance indicator. © 2013 Elsevier Ltd.


Bansal V.K.,National Institute of Technology Hamirpur
Journal of Computing in Civil Engineering | Year: 2011

Construction activities need space on the jobsite for their execution. Workers, equipment, materials, temporary facilities, and the developing structure share the limited jobsite space during the construction period. Multiple types of spaces for different purposes on various locations are required to execute various activities at different times. Hence, space planning helps provide a safe and productive environment. Planners mentally link two-dimensional (2D) drawings and execution schedules to generate dynamic multiple types of space requirements, which is a complex task. Therefore, researchers suggest the use of four-dimensional (4D) modeling and building information modeling (BIM) for space planning. Both simulate the construction process by linking the execution schedule with a three-dimensional (3D) model to visualize the construction sequence in space planning. However, both still lack features such as topography modeling and geospatial analysis, which affect space planning. In this work, 4D geographic information systems (GIS) were used for space planning that facilitates topographic modeling, different types of geospatial analyses, and database management. GIS was also used to generate multiple types of spaces corresponding to various activities. A feature attribute table (FAT) associated with each space describes when, where, and how long that space will be required on the jobsite. GIS-based area topology was implemented through a set of validation rules that define how working areas have to share the jobsite. A GIS-based methodology that enables space planning, time-space conflict identification, and conflict resolution prior to the construction was developed and implemented. © 2011 American Society of Civil Engineers.


Bansal V.K.,National Institute of Technology Hamirpur
International Journal of Project Management | Year: 2011

Execution schedule and 2D drawings are generally used for hazards identification in the construction safety planning process. Planner visualises 2D drawings into a 3D model and mentally links its components with the respective activities defined in the schedule to understand the execution sequence in safety planning. Sequence interpretation and accordingly the hazards identification vary with the level of experience, knowledge and individual perspective of the safety planner. Therefore, researchers suggest the use of four dimensional (4D) modelling or building information modelling (BIM) to create the simulation of construction process by linking execution schedule with the 3D model. Both however lack in the features like: generation and updating of schedule, 3D components editing, topography modelling and geospatial analysis within a single platform which is now a major requirement of the construction industry. This work facilitates 4D modelling, geospatial analysis and topography modelling in the development of safe execution sequence by using geographic information systems (GIS), both 3D model along with its surrounding topography and schedule were developed and linked together within the same environment. During safety review process if planned sequence results a hazard situation, it may be corrected within the GIS itself before actual implementation. Paper also discusses the use of GIS in the development of safety database from which safety information are retrieved and linked with the activities of the schedule or components of a building model. 4D modelling along with topographical conditions and safety database in a single environment assist safety planner in examining what safety measures are required when, where and why. Developed methodology was tested on a real life project in India, lessons learned from the implementation have been discussed in the potential benefits and limitations section. At last, paper highlights major research areas for further improvements. © 2010 Elsevier Ltd and IPMA.


Sharma J.N.,National Institute of Technology Hamirpur
Journal of Thermal Stresses | Year: 2011

The governing equations of flexural vibrations in a transversely isotropic thermoelastic beam are derived in closed form based on Euler-Bernoulli theory. The out-of- plane vibrations have been studied under different beam dimensions and boundary conditions. The analytical expressions for thermoelastic damping and frequency shift of vibrations are obtained. The damping and frequency shift of beam vibrations significantly depend on thermal relaxation time and surface conditions at resonance. The expressions for displacement and temperature fields in the beam resonator are obtained. Some numerical results with help of MATLAB software have been computed and presented graphically for silicon material beams. Copyright © Taylor & Francis Group, LLC.


Yadav A.K.,National Institute of Technology Hamirpur | Chandel S.S.,National Institute of Technology Hamirpur
Renewable and Sustainable Energy Reviews | Year: 2013

The tilt angle of a solar energy system is one of the important parameters for capturing maximum solar radiation falling on the solar panels. This angle is site specific as it depends on the daily, monthly and yearly path of the sun. The accurate determination of the optimum tilt angle for the location of interest is essential for maximum energy production by the system. A number of methods have been used for determining the tilt angle at different locations worldwide. Keeping in view the relevance of the optimum tilt angle in energy production and reducing the cost of solar energy systems, the present study has been undertaken. This paper provides the update status of research and applications of various methods for determining solar panel tilt angle using different optimization techniques. The study shows that for maximum energy gain, the optimum tilt angle for solar systems must be determined accurately for each location. The review will be useful for designers and researchers to select suitable methodology for determining optimal tilt angle for solar systems at any site. © 2013 Elsevier Ltd.


Sharma V.,National Institute of Technology Hamirpur | Chandel S.S.,National Institute of Technology Hamirpur
Renewable and Sustainable Energy Reviews | Year: 2013

Electricity generated using photovoltaic (PV) technology can only be economical if the PV modules operate reliably for 25-30 years under field conditions. In order to ensure such levels of reliability PV module undergo stringent qualification tests developed as per international standards by International Electro-technical Commission. These tests provide excellent information regarding module design, material and process flaws which can lead to premature failure. Even the well qualified modules are found to fail or degrade more than their expected levels when exposed to the outdoor conditions, indicating that these tests are not adequately addressing the real outdoor conditions and are not sufficient to estimate the module lifetime. Keeping in view this aspect, the performance and degradation analysis studies of solar photovoltaic modules, accelerated aging testing under laboratory and outdoor field testing conditions, are reviewed. The factors affecting the performance of PV module, PV module degradation modes, stress factors responsible for degradation, accelerated aging tests and current PV module qualification standard tests are also discussed along with recently used techniques for the failure mode analysis of PV modules. The main objective of the study is to review the literature on performance and degradation of PV modules under outdoor operation for identifying research gaps for long term reliability of PV modules and improving the PV qualification standards for various geographical and climatic conditions. © 2013 Elsevier Ltd. All rights reserved.

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