Air Conditioning
Mostrando 49-60 de 141 artigos, teses e dissertações.
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49. Service quality of building maintenance by outsourced companies: a case study in a public organization / Qualidade no serviço de manutenção predial terceirizado: um estudo de caso em uma organização pública autárquica
This scientific work investigated the subject of service quality. It refers to the question of evaluating the quality of outsourcing technical services (from specialized firms that place their employees at the sites of the client) under the approach of multiple agents it involves relationships of several employees of each organization in a business, as state
Publicado em: 2009
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50. A trade-off study of a bleedless and conventional air conditioning systems.
The objective of this work is to present a trade-off study between aircraft air conditioning systems based on conventional technology (Engine Pneumatic Bleed based) and the proposed bleedless architecture, based on the MEA (More Electric Aircraft) and Bleedless Engines concepts. The pneumatic bleed system components are thus eliminated and a dedicated compre
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/04/2008
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51. Micro-morphological changes prior to adhesive bonding: high-alumina and glassy-matrix ceramics
The aim of this study was to qualitatively demonstrate surface micro-morphological changes after the employment of different surface conditioning methods on high-alumina and glassy-matrix dental ceramics. Three disc-shaped high-alumina specimens (In-Ceram Alumina, INC) and 4 glassy-matrix ceramic specimens (Vitadur Alpha, V) (diameter: 5 mm and height: 5 mm)
Brazilian Oral Research. Publicado em: 2008-06
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52. Air conditioning control systems modelling using Petri nets. / Modelagem de sistema de controle de ar condicionado baseado em redes de Petri.
Among the trends of rational use of resources, especially energy, and the need to ensure productivity and quality in the implementation of productive activities, there is the concept of intelligent building. This environment materializes the concept of integrating building systems, powering the optimization of resources and the efficiency of human labor. In
Publicado em: 2008
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53. Measurement, prediction and analysis of airborne particles in surgical rooms. / Medição, predição e análise de partículas aéreas em salas cirúrgicas.
Air conditioning systems exert an important function in surgical rooms, to protect the surgical wound and the sterile equipments from airborne infected particles. This protection is achieved by means of a simultaneous control of the movement and distribution of the air, of the temperature, of the humidity, of the filtering, of air infiltrations from other se
Publicado em: 2008
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54. Thermal comfort and energy efficiency in Budget Hotels / Conforto térmico e eficiência energética em hotéis econômicos
This work aims to evaluate the energy efficiency and comfort level, in airconditioned environments of budget hotels, from international chains, in São Paulo, Brazil. The evaluation was directed to the apartments which are the hotels main product featuring air conditioning, even though the climate conditions and usage profile dont determine its need. One hot
Publicado em: 2008
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55. Avaliação numérica e experimental de técnicas de controle para conforto térmico em edificações
Abstract: This work addresses the problem of numerical and experimental analysis of comfort control algorithms for air conditioning systems with one manipulated variable. This is a frequent case present in HVAC (Heating, Ventilating and Air Conditioning) systems. The aim of HVAC equipment is to promote thermal comfort for building occupants. So, in order to
Publicado em: 2008
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56. Physiological potential of seeds from silage sorghum due to different sequence of conditioning / Potencial fisiológico de sementes de sorgo silageiro em função de diferentes seqüências de beneficiamento
This paper had the objective of checking the effects of three different sequence of conditioning on the qualities of seeds from silage sorghum (Sorghum bicolor L.) and to such deed, it was used FEPAGRO-RS 11, FEPAGRO-RS 12, FEPAGRO 17 e FEPAGRO 18. The treatment followed the next sequence: T1- pre cleaning; T2 pre cleaning plus three passages through cleanin
Publicado em: 2008
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57. Determinação de índices de ajuste no controle de sistema de condicionamento de ar do tipo teto frio. / Determination of adjustment indexes in control of "cooling ceiling" air conditioning system.
O presente trabalho é um estudo para a determinação de índices de ajuste em medidas efetuadas por sensores de temperatura do ar utilizadas em algoritmos de controle do sistema de automação do sistema de condicionamento de ar do tipo "Teto Frio". É um trabalho experimental baseado na coleta de dados de diversas variáveis ambientais em um laboratório
Publicado em: 2008
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58. MODELAGEM DE EVAPORADORES TIPO PLACAS PARA SISTEMAS CONDICIONADORES DE AR AUTOMOTIVOS / MODELING OF EVAPORATORS TYPE LAMINATED PLATE FOR AUTOMOTIVE AIR CONDITIONING SYSTEMS
A simulation model for automotive brazed laminate plate evaporators, for humid air cooling, was developed. The model adopts the local analysis method, where the heat exchanger is divided into a number of elemental control volumes, for which the equations of heat transfer and conservation of energy are applied. In order to determine the local heat transfer co
Publicado em: 2008
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59. Thermal comfort and local discomfort conditions in surgical rooms. / Condições de conforto térmico e desconforto local em salas cirúrgicas.
Hospitais e demais instalações médicas constituem-se em ambientes complexos, que requerem sistemas de tratamento de ar e de ventilação adequados para o conforto e segurança de pacientes, de pessoal e de visitantes. Em ambientes cirúrgicos as condições de conforto térmico precisam ser as melhores possíveis, para que o cirurgião e a equipe médica
Publicado em: 2008
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60. Estudo de variaveis que atuam no processo de cimentação de restaurações ceramicas : atenuação da luz, modos de ativação e tratamento superficial / Study of variables that act in the luting process of ceramic restorations : light attenuation, activation mode, and surface treatment
The durability of ceramic restoration depends of factors like the conversion degree of a luting agent and the interaction of this luting agent with the ceramic internal surface. These in vitro studies evaluate: (1) the influence of different ceramics and the effect of different activation modes on Knoop Hardness Number (KHN) of a dual agent luting, immediate
Publicado em: 2008