Domestic Water Heating
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Chemical Speciation of Iron in Different Varieties of Beans (Phaseolus vulgaris L.): Cooking Effects
Beans are considered a source of iron (Fe), and hence have considerable contribution in cases of Fe deficiency. Beans also contain certain anti-nutritional constituents, which are imperative to the cooking of beans. The nutritional value of beans depends on the bioavailability, which can be affected by cooking. Studies about heating effects in distribution o
J. Braz. Chem. Soc.. Publicado em: 2015-10
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2. O uso de aparelhos de micro-ondas domésticos em aulas experimentais de química orgânica: nitração de salicilaldeído
The use of microwave in chemistry has known benefits over conventional heating methods, e.g. reduced reaction times, chemical yield improvement and the possibility if reducing or eliminating the use of organic solvents. We describe herein a procedure for the nitration of salicylaldehyde in water using a domestic microwave oven, which can be used as an experi
Química Nova. Publicado em: 2010
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3. Aquecimento de água no setor residencial / Residential water heating
The residential sector reflects the culture of the indiscriminate use of electricity water heating. Inclusion of gas and thermosolar energy to the electrical supply system may present advantages as they are more compatible to consumer"s heat transformation processes. In addition these new sources of energy may decrease the electrical and electrothermal syste
Publicado em: 2007
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4. The effect of the carbon content on the grain size coarsening and on the magnetic properties of the semi processed electrical steels after the final annealing. / O efeito do carbono no aumento do tamanho de grão e nas propriedades magnéticas de aços elétricos semiprocessados após o recozimento final.
Annealing applied by the motors plants that are made on the semi processed electrical steels without an exact and precisious control of the decarburization on the lamination can brings undesirable results on the grain size coarsening and as a result an increasing on the core losses with a significant depreciation on the efficiency of the electrical motors. M
Publicado em: 2006
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5. Determinação da relação água/cimento utilizando microondas
The relation between water and cement present in the fresh concrete is determinant for the concrete to reach the desired requirements of development: a concrete that would uphold its characteristics, especially mechanical ones during its useful life. Research work indicates that a suitable method for determining this relation is through the heating produced
Publicado em: 2005
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6. Experimentos didáticos envolvendo radiação microondas
Theoretical and practical aspects of the use of microwave-assisted strategies in chemistry are introduced for students using simple and safe experiments employing a domestic oven. Three procedures are proposed for evaluating the distribution of microwave radiation inside the microwave oven cavity: (1) variation of the volume of marshmallows; (2) drying of fi
Química Nova. Publicado em: 2004-12
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7. Optimization of solar energy water heating systems in single-family residences using the TRNSYS program. / Otimização de sistema de aquecimento solar de água em edificações residenciais unifamiliares utilizando o programa TRNSYS.
Solar water heating systems have been widely used in Brazil for domestic purposes in single-family residences, taking advantage of the potential energy of the water of the superior reservoir and the phenomenon of the termosyphon for the circulation of the hot water. However these solar water heating systems are usually design through tables supplied by the m
Publicado em: 2003
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8. Estudo de diferentes processos de torração de café por metodo convencional e microondas
The objective of this study was to contribute a greater knowledge about different coffee roasting processes by both conventional and microwave methods, comparing the effects on different qualities of arabica coffee (hard to better, soft and very soft). Thus experimental coffee roasting conditions were developed [domestic and rapid (industrial) at 210°C and
Publicado em: 2001
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9. Modelagem numerica de uma maquina frigorifica de compressão de vapor
The main objective of this work is to present two numerical models to simulate the dynamic and steady-state behavior of an water-water compression vapor system. The condenser and the evaporator are divided in control volumes. A time dependent partial differential equations system is obtained from the mass, energy and momentum balances for each one control vo
Publicado em: 1998
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10. Extração e determinação simultanea por emissão em plasma de nutrientes e elementos toxicos em amostras de interesse agronomico
The objective of this study was to evaluate chemical elements extraction processes for soil, plant and residue analysis by inductively coupled plasma atomic emission spectrometry (ICP-AES) technique. The critical step of the chemical analysis using the ICP-AES technique, is the sample extraction or dissolution. In the case of soil analysis, boron was a troub
Publicado em: 1997
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11. Phylogenetic Diversity Analysis of Subterranean Hot Springs in Iceland
Geothermal energy has been harnessed and used for domestic heating in Iceland. In wells that are typically drilled to a depth of 1,500 to 2,000 m, the temperature of the source water is 50 to 130°C. The bottoms of the boreholes can therefore be regarded as subterranean hot springs and provide a unique opportunity to study the subterranean biosphere. Large v
American Society for Microbiology.