Other affiliations: Indian Institute of Technology Madras, Indian Institute of Technology Delhi, Indian Institutes of Information Technology
Bio: Naveen Kumar is an academic researcher from Indian Institute of Information Technology Design & Manufacturing Kancheepuram. The author has contributed to research in topics: Mach–Zehnder interferometer & Interferometry. The author has an hindex of 9, co-authored 37 publications receiving 316 citations. Previous affiliations of Naveen Kumar include Indian Institute of Technology Madras & Indian Institute of Technology Delhi.
TL;DR: In this paper, a truncated pyramid geometry based multipurpose solar device which could be used for domestic cooking as well as water heating is presented. But, the performance of the design was also evaluated as a hot water system and the maximum efficiency was found to be 54%.
TL;DR: A truncated pyramid-type solar box-type cooker was designed, fabricated and tested in this article to completely eliminate the need for tracking the sun during cooking, as tracking of sun does not yield better performance.
TL;DR: In this paper, four exergy based parameters are proposed for solar cookers of different topological design, as their thermal performance indicators, and graphs between exergy output power and temperature difference are plotted, and they resemble a parabolic curve for each design.
TL;DR: In this paper, the time variation of instantaneous exergy output and energy output as function of its temperature and also of the instantaneous ambient temperature have been reported for truncated pyramid type solar box type cookers and compared with those of box type cooker.
TL;DR: In this article, a bend-induced birefringent fiber-based loop mirror (FLM) was used as a gain-flattening filter to flatten the amplified spontaneous emission (ASE) spectrum from an erbium-doped fiber.
Abstract: We report flattening of the amplified spontaneous emission (ASE) spectrum from an erbium-doped fiber (EDF) using a standard fiber-based loop mirror (FLM), realized with an "over-coupled" fiber coupler. Through simulation, a bend-induced birefringent FLM as a gain-flattening filter is designed. Subsequently, an over-coupled coupler with a free spectral range of 140 nm is fabricated to realize the FLM, which is integrated to an EDF that is pumped by a 980-nm laser diode. By introducing an appropriate amount of bend-induced birefringence in the loop, the ASE spectrum of the EDF could be flattened within /spl plusmn/0.5 dB over a wavelength range of 32 nm in the C-band.
TL;DR: This paper reviews the present day solar thermal technologies and performance analyses of existing designs, mathematical simulation, design and fabrication of innovative designs with suggested improvements have been discussed.
Abstract: The use of solar energy in recent years has reached a remarkable edge. The continuous research for an alternative power source due to the perceived scarcity of fuel fossils is its driving force. It has become even more popular as the cost of fossil fuel continues to rise. The earth receives in just 1 h, more energy from the sun than what we consume in the whole world for 1 year. Its application was proven to be most economical, as most systems in individual uses requires but a few kilowatt of power. This paper reviews the present day solar thermal technologies. Performance analyses of existing designs (study), mathematical simulation (design) and fabrication of innovative designs with suggested improvements (development) have been discussed in this paper.
TL;DR: In this article, a review of the available literature on solar cookers is presented in a thematic way in order to allow an easier comparison, discussion and evaluation of the findings obtained by researchers, especially on parameters affecting the performance of solar cooks.
TL;DR: In this article, an extensive literature review on both the energy and exergy analyses of typical renewable energy systems including, solar thermal, solar photovoltaic and biomass cookstove is presented.
Abstract: The use of renewable energy systems for real life applications has been increasing for the last few decades due to the growing concern about the global warming and environmental pollution. The renewable energy sources are clean and freely available in the nature, however, the efficient utilization is still a cause of concern among the scientific and business communities. This paper presents an extensive literature review on both the energy and exergy analyses of typical renewable energy systems including, solar thermal, solar photovoltaic and biomass cookstove. Some important conclusions from the literature survey has been drawn and summarized in this paper. Among all important aspects studied and summarized in this paper, it is found that most of the analysis carried out for renewable energy systems so far is based on the energy analysis. Also for all renewable energy systems, the performance based on exergy analysis, in general, is found to be lesser than that of the energy analysis.
TL;DR: In this article, the authors summarized the previous findings on energy and exergy analyses of different solar energy systems (solar drying, solar air conditioning and refrigeration, solar water heating, solar cooking and solar power generation through solar photovoltaic and concentrated solar power techniques used for various heat and power generation applications).
Abstract: The overuse of fossil fuels in real life applications has caused their rapid depletion and fast climate change due to global warming and thus access to eco-friendly energy resources has become essential to meet the growing demand of clean energy. With this view, solar energy has proven to be an effective alternative and clean source of energy for the sustainable development of the society worldwide. Solar energy is a cheap, abundant and everlasting source of renewable energy and thus it can be integrated with different systems deals with energy consumption to overcome the dependency of present society on conventional fuels. Such integration of solar energy has given an opportunity for several studies based on the energy and exergy approaches. The energy analysis is very crucial in the study of process effectiveness while the exergetic analysis is another important tool to investigate the realistic behaviour of process involving various energy losses and internal irreversibility. The main objective of this article is to bring out valuable recommendations for wide exploitation of solar energy systems for different applications, from a thermodynamics perspective. Therefore, the present article has summarized the previous findings on energy and exergy analyses of different solar energy systems (solar drying, solar air conditioning and refrigeration, solar water heating, solar cooking and solar power generation through solar photovoltaic and concentrated solar power techniques used for various heat and power generation applications).
TL;DR: In this article, a simple solar box cooker with a wiper type mechanism to remove vapor droplets from the bottom of glazing, during the cooking process has been introduced and discussed with a new designed cooking vessel.
Abstract: Globally there is profuse literature on the continuous developments of box type solar cookers and solar ovens. A lot of research work has been carried out in recent passed years in the world which clearly shown the utilization of solar energy towards the greatest needs of mankind obviously solar cooking, fuel saving, non-polluting environment and to save and produce electricity. In the present literature the efforts have been made to focus on diverse developments of box type solar cooker till now. An attempt has been made to optimize the various major parameters such as geometries of box-cooker, glazing system, cooking vessels design, heat storage, insulation, mirror boosters and financial feasibility of solar cooker box. All the discussed factors have been taken into account in the fabrication of a simple solar box cooker and a good improvement has been found in the performance of box cooker with efficient working in low ambient temperatures. A wiper type mechanism to remove vapor droplets from the bottom of glazing, during the cooking process has been introduced and discussed with a new designed cooking vessel. The investigational testing of the fabricated box cooker has been carried out under the climate conditions of Moradabad (latitude – 28°58′north and longitude – 78°47′east) Uttar Pradesh.