Air Conditioning Systems
Mostrando 25-36 de 52 artigos, teses e dissertações.
-
25. Refrigeração evaporativa por aspersão em telhas de fibrocimento: estudo teórico e experimental
This research focuses the evaporative cooling by water aspersion on wavy cement fiber tiles in the city of São Carlos, SP, seeking to use it to reduce the buildings heat gains. A theoretical model was developed, based on classic equations of fluids mechanic, applied to iterative calculations of heat flows on the tile superior surface, considered as control
Publicado em: 2007
-
26. AvaliaÃÃo econÃmica da substituiÃÃo de um chiller de compressÃo por um chiller de absorÃÃo alimentado por coletores solares com base em mediÃÃes em um prÃdio da Chesf em Recife
The perspective of rising costs for electrical energy and fossil fuels, together with more efficient solar colectors and absorption chillers, stimulates for the retaking of the analisys towards the utilization of solar refrigeration systems, mainly in regions with good insolation characteristcs, like Northeast Brazil . Considering this context, this document
Publicado em: 2007
-
27. Resfriamento evaporativo e condicionamento de ar convencional: estudo experimental comparativo / Evaporative cooling and conventional air conditioning: a comparative experimental study
This experimental research aims to compare the evaporative cooling with the conventional air conditioning in terms of levels of humidity, reduction in indoor air temperature, and energy consume. The experiment was conducted in three purpose-built test cells, similar in structure, which were exposed to the same climatic conditions and showed the same indoor a
Publicado em: 2006
-
28. Software Scada as platform for the intelligent rationalization of electric energy in build automation / Software Scada como plataforma para a racionalização inteligente de energia elétrica em automação predial
This work proposal is to develop an intelligent system, that using building automation technology, and through the monitoring of variables generally neglected by traditional control systems, together with the strategy of a specialist control, generates a considerable economy on the consumption of electric energy in closed environments with air conditioning d
Publicado em: 2006
-
29. Metodologia para avaliação econômica de unidades resfriadoras de líquidos por ciclos de compressão e absorção / Methodology for economic evaluation of vapor compression and absorption cycle chillers
This study presents a methodology for economic feasibility studies of the applicability of absorption cycle air conditioning systems in buildings in Brasilia - DF using natural gas as fuel. The verification process of economic viability here presented intends to be applied in existing buildings as well as in future projects. The elaborated methodology uses e
Publicado em: 2006
-
30. Estudo sobre o emprego de dispositivos sem fios - wireless na automação do ar condicionado e de outros sistemas prediais. / A study of wireless devices technology application for the automation of the air conditioning and other building systems.
Este trabalho apresenta um estudo de tecnologias de comunicação sem fio e suas aplicações na automação predial. A principal motivação para a elaboração deste trabalho é o uso crescente dessas tecnologias em diversas áreas, principalmente em sistemas de automação industrial, comercial, residencial e predial. O uso de equipamentos como telefones
Publicado em: 2006
-
31. An evaporative and desiccant cooling system for air conditioning in humid climates
Evaporative cooling operates using water and air as working fluids. It consists in water evaporation, through the passage of an air flow, thus decreasing the air temperature. This system has a great potential to provide thermal comfort in places where air humidity is low, being, however, less efficient where air humidity is high. A way to solve this problem
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-09
-
32. Numerical analysis of water melting and solidification in the interior of tubes
Latent energy storage systems find applications in many engineering fields, including industrial refrigeration plants, air conditioning installations, recovery of heat in industrial processes, etc. To tackle the design of such systems, it is necessary to have correlations to account for the heat transfer during the melting and solidification of the phase cha
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-06
-
33. Resistencia a união e padrão de condicionamento em esmalte de sistemas adesivos autocondicionantes aplicados de forma passiva ou ativa / Microtensile bond strength evaluation of self-etchiung adhesive systems on enamel
The aim of this study were evaluate the bond strength and conditioning pattern obtained from different self-etching adhesive systems applied on enamel by active and passive forms. 100 bovine incisors were sectioned in 6x6mm fragments from the buccal enamel surface. The specimens were divided into 10 groups (n= 1 O). It was used one single bottle adhesive sys
Publicado em: 2005
-
34. Modelagem da transferência de calor combinada por condução e radiação em isolantes térmicos de edificações
New insulation materials are being used in building industry to reduce electric energy consumption due to presence of HVAC (Heating, Ventilation and Air Conditioning) systems or to improve the thermal comfort of non-conditioned environments. An insulation material used in ceilings is the glass wool. The glass wool is considered as a semitransparent material,
Publicado em: 2005
-
35. Arquitetura residencial das superquadras do Plano Piloto: aspectos de conforto térmico
Brasília, capital of Brazil, is a new city, planed and built between 1956 and 1960. The objects of this study are the residential buildings, constructed from 1958: most of those followed the modern style, using horizontal strip windows. This often implicates in facades with a high percentual of glazing. However, most of the buildings dont have any kind of s
Publicado em: 2005
-
36. Modeling and experimental evaluation of parallel flow micro channel condensers
This paper reports results obtained in a theoretical and experimental study involving micro channel/louvered fin condensers for automotive applications. A simulation model has been developed based upon three zones related to the thermodynamic states of the refrigerant in the condenser. Experiments with condensers have been performed in a set up developed for
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-04