Air Coil
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Estudo experimental e numérico sobre o uso do solo como reservatório de energia para o aquecimento e resfriamento de ambientes edificados
Objetivos: Este trabalho, abrangendo a área da transferência de calor e da mecânica dos fluidos, em seu desenvolvimento envolveu métodos analíticos, numéricos computacionais e experimentais (em ambiente de campo), com a finalidade de analisar o uso de trocadores de calor solo-ar, como estratégia para diminuir o consumo de energia convencional, no aque
Publicado em: 2011
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2. CFD analysis of tube-fin 'no-frost' evaporators
The purpose of this paper is to assess some aspects of the design of evaporators for household refrigeration appliances using Computational Fluid Dynamics (CFD). The evaporators under study are tube-fin 'no-frost' heat exchangers with forced convection on the air-side and a staggered tube configuration. The calculation methodology was verified against experi
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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3. Effectiveness-ntu computation with a mathematical model for cross-flow heat exchangers
Due to the wide range of design possibilities, simple manufactured, low maintenance and low cost, cross-flow heat exchangers are extensively used in the petroleum, petrochemical, air conditioning, food storage, and others industries. In this paper a mathematical model for cross-flow heat exchangers with complex flow arrangements for determining epsilon -NTU
Brazilian Journal of Chemical Engineering. Publicado em: 2007-12
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4. Simulação de sistemas de climatização combinada à simulação higrotérmica de edificações
Due to the nonexistence of a building simulation program that can simulate in details the combined heat, vapor and liquid transfer in porous elements and the HVAC systems, a generic and flexible computational algorithm has been elaborated in order to integrate models for both HVAC systems and multizone building models. In that algorithm, mathematical models
Publicado em: 2006
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5. Influence of geometric parameters on the air-side performance of air coils / Influência de parâmetros geométricos no desempenho termo-hidráulico do lado do ar em serpentinas
O objetivo da presente pesquisa é analisar o desempenho termo-hidráulico do lado do ar de trocadores de calor tubo-aletados. Uma pesquisa da literatura foi executada em duas áreas diferentes: desempenho termo-hidráulico e seleção de superfície, feita por comparações de desempenho, para otimizar o projeto de trocadores de calor. O impulso principal d
Publicado em: 2005
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6. Desenvolvimento e estudo comparativo de sensores para radiação liquida
The objective of the present work was to develop a net radiometer, through the construction of different models of sensors, with different geometries and surface coverings. The basic sensor, which was called model I, consisted of a 2.6 x 7.8 x 0.2 cm phenolite plate, wound with a constantan wire, which was copper plated in half of each coil, using slow elect
Publicado em: 1982
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7. Heterotrophic bacteria in an air-handling system.
Heterotrophic bacteria from structural surfaces, drain pan water, and the airstream of a well-maintained air-handling system with no reported building-related illness were enumerated. Visually the system appeared clean, but large populations of bacteria were found on the fin surface of the supply-side cooling coils (10(5) to 10(6) CFU cm-2), in drain pan wat
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8. Nature, structure, and properties of asbestos cement dust
ABSTRACT Total dust samples produced by machining three commercial asbestos-cement products (autoclaved sheet, non-autoclaved sheet, pipe) were examined for their dimensional, surface, and physicochemical characteristics. Microscopic inspection of dust fractions with different settling characteristics in air allowed determination of the simple dimensional fe
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9. Automated polymerase chain reaction in capillary tubes with hot air.
We describe a simple, compact, inexpensive thermal cycler that can be used for the polymerase chain reaction. Based on heat transfer with air to samples in sealed capillary tubes, the apparatus resembles a recirculating hair dryer. The temperature is regulated via thermocouple input to a programmable set-point process controller that provides proportional ou
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10. Secondary structure of the immunoglobulin J chain.
J chain is a 137-residue polypeptide that is covalently linked to polymeric immunoglobulins and participates in their synthesis and transport to external secretions. To clarify these roles, the secondary structure of J chain was characterized by computer-assisted analyses of human and mouse sequences and by circular dichroism measurements of the isolated J c
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11. Identification and Quantitative Analysis of the Volatile Substances Emitted by Maturing Cotton in the Field
When atmosphere from cotton plants (Gossypium hirsutum L., var. Deltapine Smoothleaf) was condensed by passing it over the expansion coil of an air conditioner and three 1-hour collections per day (early morning, noon, and late afternoon) were made, the total essential oils were found to consist of 50 to 60% β-bisabolol (Ik 1660) and γ-bisabolene (Ik 1550)
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12. Embolisation of pulmonary arteriovenous malformations: results and follow up in 32 patients.
BACKGROUND--Pulmonary arteriovenous malformations may cause a number of complications when left untreated. Embolisation of the feeding vessels is a relatively new approach and information concerning its efficacy and long term results is scarce. METHODS--Pulmonary arteriovenous malformations with feeding arteries of > 3 mm were treated by embolisation. Right