Heat Pumps
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Avaliação energética de um edifício de serviços: Escola Superior Aveiro Norte, Portugal
Resumo O objetivo deste trabalho é realizar uma avaliação energética da Escola Superior Aveiro Norte (ESAN), situada no município de Oliveira de Azeméis (Portugal). Esse edifício possui tecnologias de climatização pouco convencionais em Portugal, como bombas de calor geotérmicas associadas a piso radiante e ventilação, com pré-aquecimento de ar,
Ambient. constr.. Publicado em: 03/10/2019
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2. RESTARTABILITY OF VISCOPLASTIC MATERIALS IN PIPES / REINÍCIO DE ESCOAMENTO DE MATERIAIS VISCOPLÁSTICOS EM UM TUBO
On of the main problems in the operation of subsea pipelines that convey paraffin oils is the flow startup after long stoppages. Along the path from the reservoir to the platform, the oil experiences significant heat losses, especially to the low-temperature water at the sea bottom. When there is no flow, the oil may reach very low temperatures. Cooling indu
Publicado em: 2011
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3. Desempenho energético e caracterização dos sistemas de aquecimento de água de piscinas. / Energetic performance and characterization of swimming pool heating systems.
The aim of this research is to investigate the energetic performance of two distinct kinds of swimming pool heating systems: gas-fired and electric heat pump. A practical instrumentation research was prepared in these two indoor swimming pools, placed in the same location. Besides these, other four swimming pool, placed each in a different ambient in the cit
Publicado em: 2010
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4. Desenvolvimento de um sistema de bomba de calor agua/agua para resfriammento e secagem de tomates / Development of a system for heat pump water/water for cooling and drying of tomatoes
O tomate destinado tanto ao consumo de mesa, in natura, quanto à produção industrial, é uma hortaliça consumida o ano inteiro, sendo o Brasil um grande produtor, nas regiões Centro Sul e em algumas regiões do Nordeste e Sul do país. Mas as perdas pós-colheita superam 50 % durante o processo de colheita e de pós-colheita. Estas perdas são principal
Publicado em: 2008
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5. Modelagem do escoamento monofásico em bomba centrífuga submersa operando com fluidos viscosos / On the influence of viscosity upon electrical submersible pumping performance
In the oil industry, when artificial lift using Electrical Submersible Pumps (ESP) is considered, there is a need to determine their performance for displacing oils of medium to high viscosity. This work proposes a model that is able to predict the performance of conventional centrifugal pumps and ESPs when pumping heavier oils (meaning oils of high viscosit
Publicado em: 2007
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6. 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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7. Rational use of energy in dairy farms with pumps / Uso racional de energia em fazendas leiteiras com bombas de calor
O leite é um dos mais importantes produtos da agropecuária nacional, com cerca de 2/3 das propriedades rurais do país destinando-se à pecuária leiteira e com um dos maiores rebanhos do mundo. Apesar da grandiosidade, o setor ainda sofre com a baixa produtividade, os altos custos e a defasagem tecnológica. Como conseqüência, muitos produtores abandona
Publicado em: 2006
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8. DETERMINAÇÃO EXPERIMENTAL DO COEFICIENTE DE TROCA DE CALOR EM UM GERADOR DE PASTA DE GELO / EXPERIMENTAL DETERMINATION OF THE HEAT TRANSFER COEFFICIENT IN AN ICE SLURRY GENERATOR
New ice crystal slurry thermal energy storage (TES) system has been developed for both HVAC and process cooling applications. The system uses an orbital rod evaporator (ORE), a vertical shell-and-tube heat exchanger with mechanical heat transfer augmentation, as a dynamic ice maker to generate liquid ice. Ice forms continuously without accumulation in the OR
Publicado em: 2003
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9. Simulação computacional de eventos termo-hidraulicos transitorios em multicircuitos com multibombas
PANTERA-2 (from Programa para Análise Termo-hidráulica de Reatores a ÁguaProgram for Thermal-hydraulic Analysis of Water Reactors, Version 2), whose fundamentals are described in this work, is intended to carry out rod bundle subchannel analysis in conjunction with multiloop simulation. It solves simultaneously the conservation equations of mass, axial an
Publicado em: 2003
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10. Contribuição da velocimetria doppler laser para a otimização de componentes descartaveis utilizados em circulação extracorporea
t: Introduction: Cardiopulmonary bypass ( CBP ) associates techniques that allow a temporary cardiopulmonary isolation through utilization of a set of machines, devices and circuits. Sophisticated techniques must be applied in order to study blood behavior inside cardiopulmonary bypass system without interference. The Laser Doppler Velocimetry (LDV) uses lig
Publicado em: 2002
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11. Gamma-interferon inhibits collagen synthesis in vivo in the mouse.
Subcutaneous implantation of osmotic pumps into CAF1 mice resulted in the formation of thick fibrous capsules around the pumps. When pumps were loaded with recombinant murine gamma-interferon (rMuIFN-gamma) to deliver 2 X 10(3) U/h for 14 d, there was a marked decrease in thickness and collagen content of the capsules from rMuIFN-gamma-treated animals compar
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12. van't Hoff-van der Waals osmotic pressure and energy transformers
We find the van't Hoff relations between osmotic pressure, freezing point depression, and boiling point elevation provide a clue on how, by using salt solutions, one may lower the cost of extracting power from low-grade heat sources. In particular, the ratio of 7 between the heat of evaporation and the heat of freezing of pure water suggests a chemical syste