This work has the objective of developing a methodology for the evaluation of indoor natural lighting systems, which, with speed and practicality, provides from real conditions of use a reliable result about the quality and performance of the proposed system. The methodology is based on the construction of two real-size test environments, which will be subjected to a natural light system through reflexive tubes made from recycled material, and to a commercial system already certified and consolidated, creating the possibility of comparison. Furthermore, the data acquired in the test environments will be examined in light of the values of solar radiation obtained from a digital meteorological station, such that it is possible to stipulate the lighting capacity of the systems at different times of the year.
Abstract:In the search for alternatives to reduce the consumption of electric energy, the possibility of using natural light for lighting through TDD (tubular daylight devices) or TDGS (tubular daylight guidance systems) appears. These natural luminaires are used in rooms where you want to save electricity and enjoy the benefits of natural light. The present work proposes the construction of a tubular system for the conduction of natural light that replaces aluminum with silver (currently marketed by several companies) by polymer metallized with aluminum, offering a low cost. The polymer acrylonitrile butadiene styrene (ABS), coated with aluminum by physical vapor deposition (ionization), was evaluated for some tests to verify characteristics of the structure and the metallized surface. After the tests, the construction of the reflective tube was performed and validated in a real scale of application. The results proved the technical viability of the proposed tube construction for the realization of direct sunlight for illumination using polymeric material. Although it has produced 35% less than the reference tube, it can be marketed at an estimated cost of 50% less.
This work consists of the study and development of a hybrid lighting system that uses Led as artificial light source and sunlight as a natural source. Starts with a survey of this technology being developed in the tubular lighting system as well as the search for its replacement by alternative materials as a way to fund the project, uniting quality and reduced cost. With the definition of constructive elements, proceeds to the beginning of project design and development of control to maintain brightness in the environment system. Using as guidance the Brazilian Standards, which govern the methods of measuring brightness, as well as the procedure for creating models scaled tools. Finally presents the tests and their results, demonstrating the possibility of developing a hybrid lighting system at low cost.
This paper presents a study of the national electric power, showing the Brazil consumes electricity in a year and how much you could save if thermoelectric modules were used in some industries and new cars and planes to capture and transformation of residual thermal energy into electrical energy. The conclusion appears really attractive economically, given the fact that many processes generate residual thermal energy and also energy cogeneration using thermoelectric modules is totally clean, which prevents the emission of greenhouse gases to the environment.
This article applies the Three-phase Planar Actuator (T.P.A.) core in two configurations: complete and reduced model for analysis in numerical and real modes. The T.P.A. is a two degree of freedom induction machine similar as two linear motors in a unique traction element. To validate the simulations, a real T.P.A. was built with Steel1010 as core material. The magnetic flux was measured by exploratory coils and compared with numerical model software's results. After the validation, the core's material was substituted by SMC Somaloy500which has a high magnetic permeability allied with a higher resistivity than Steel1010and new simulations were made with variation of operating frequencies. The validation's results indicate a correct numerical modelled device with a maximum error of 9,64% and a better response with SMC Somaloy500 for force measurements especially in relative high frequencies up to 120Hz. With Somaloy500 the x-axis force were almost 9 times higher than the Steel1010 as primary core material.
This article presents a case study of the feasibility of power generation using biofuels from a landfill, with a high concentration of solid waste from the city of Criciúma, SC, Brazil. The main objective of this paper is to show the potential energy existing in landfills, even in medium-sized cities, and that the energetic use of biogas is an accessible alternative to be implemented. For this, it was analyzed two forms of energy generation from municipal solid waste. At the first case it was considered the use of biogas generated in landfills and at the second the waste incineration and for both cases it is presented a study of economic feasibility.
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