Navegando por Assunto "Energy performance"

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Acesso aberto (Open Access)
Desempenhos térmico e energético de uma edificação na região amazônica brasileira
(Universidade Federal do Pará, 2018-09-06) AGUILAR, Heliana Maria Ceballos; PINHO, João Tavares; http://lattes.cnpq.br/0847897516772421
This work presents an innovative proposal of integration of several strategies to reduce energy consumption, where the impact of each one of them is evaluated individually, and all together, in the thermal, energetic and economic performance of a building located in the Brazilian Amazon Region. High temperature and humidity characterize this region climatically, where achieving adequate comfort conditions implies a high demand for energy for air conditioning systems. Different Energy Conservation Measures are evatuated in order to achieve a better use of daylighting; and to reduce thermal loads for cooling, with the installation of a thermal insulation material in the eastern and western walls, and a thermal insulation and air chamber in the roof, which are the external surfaces that receive higher solar radiation in the building. Additionally, various photovoltaic generation systems are considered, one of which is integrated as an architectural element and another adapted on the roof of the building. In the building, two types of analysis are conducted: dynamic and static. For the dynamic analysis, the EnergyPlus software is used to know its thermal and energy consumption performances, analyzed for the entire year and for the design day, and the Daysim/Radiance software to know the autonomy of daylighting attained, using data measured with an on-site meteorological station. Concerning the static analysis, the level of energy efficiency is evaluated by the prescriptive method according to the current national regulations. Subsequently, the same building is simulated for the nine capital cities of the states of the Legal Brazilian Amazon Region, with the aim of knowing its energetic performance and the economic feasibility depending on the climatic characteristics and electrical energy tariffs of each city. With the assessments performed, it is determined that the ECM have a direct and significant influence on the reduction of the thermal load for cooling, through the reduction of radiation effects, the shading in the eaves and the reduction of the transmittance of the surfaces treated. The possibility of maximizing the daylight in internal spaces, to improve the comfort of the users is also verified, allowing better performance and energy savings with artificial lighting. In terms of energy consumption and economic feasibility, the ECM achieve an annual energy savings of 52 % in the building taken as a case study, and the solutions adopted show a good return on financial investment, and are also suitable for energy saving and economically feasible in regions with similar climatic characteristics.
Acesso aberto (Open Access)
Desenvolvimento e aplicação de metodologia para avaliação de desempenho hidroenergético de sistemas de abastecimento de água
(Universidade Federal do Pará, 2016-02-19) REGO, Augusto da Gama; PEREIRA, José Almir Rodrigues; http://lattes.cnpq.br/9918600634569244
This doctoral thesis aims developing a methodology and implementing it on software in order to evaluate a water supply system (WSS) hydro-energetic performance, as well as applying it on a real scale WSS. This paper was carried out in two stages: 1) modeling the hydro-energetic performance evaluation process, establishing of formulations to calculate hydro-energetic losses and implementing methodology on software; 2) applying the methodology at a real scale WSS, which required monitoring of hydraulic and electrical quantities and simulating this WSS at Epanet 2.0. The first stage results consisted at defined hydro-energetic losses and conceptualize hydro-energetic performance on the proposed methodology, which consists sequences of actions and mathematical formulation to calculate hydro-energetic losses at the WSS, as well as to evaluate WSS hydro-energetic performance and, finally, at methodology implementation in a software using Visual Basic for Applications (named as SADHE2A) and successfully tested at the WSS with synthetic data. The second stage results are related to methodology application at WSS of Guanabara (located at Ananindeua city, Pará, Brazil), using SADHE2A – versão Beta, in which were identified water global losses of 55.42% and electrical energy global losses of 8.31% (both classified as “bad” by the methodology), resulting in an economical deficit of 17,981.77 R$/month. This value is equivalent to 57.61% of electrical energy costs, since raw water pumping to the final water costumer. Finally, the methodology developed has met the research expectations to calculate the water losses and electricity consumed losses and to evaluate the hydro-energetic performance of the WSS in Brazil and world.