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5 results on '"evaporative cooling"'

1. Fan and Pad Greenhouse Evaporative Cooling Systems

Author

Jonathan A. Watson, Celina Gómez, Ray A. Bucklin, J. D. Leary, and Dennis B. McConnell

Subjects
Evaporative Cooling, Fan and Pad, Cooling Systems, Systems Efficiency, Airflow, Controls, Agriculture (General), S1-972, Plant culture, SB1-1110, Biology (General), QH301-705.5
Abstract

In Florida, greenhouse temperatures can easily exceed 100°F during the summer if they are not equipped with active cooling systems. Such high temperatures reduce crop quality and worker productivity. Evaporative cooling is the most common method for reducing the temperature inside a greenhouse, but it has limitations in our hot, humid climate. Air conditioning or refrigeration systems can be used, but their installation and operating costs are usually prohibitive. This 6-page fact sheet is a minor revision written by J. A. Watson, C. Gómez, R. A. Bucklin, J. D. Leary, and D. B. McConnell, and published by the Department of Agricultural and Biological Engineering, September 2019. CIR1135/AE069: Fan and Pad Greenhouse Evaporative Cooling Systems (ufl.edu)

Published
2019

2. Evaporative cooling: water for thermal comfort

Author

José Rui Camargo

Subjects
evaporative cooling, air conditioning, thermal comfort, Environmental sciences, GE1-350
Abstract

Evaporative cooling is an environmentally friendly air conditioning system that operates using induced processes of heat and mass transfer, where water and air are the working fluids. It consists, specifically, in water evaporation, induced by the passage of an air flow, thus decreasing the air temperature. This paper presents three methods that can be used as reference for efficient use of evaporative cooling systems, applying it to several Brazilian cities, characterized by different climates. Initially it presents the basic operation principles of direct and indirect evaporative cooling and defines the effectiveness of the systems. Afterwards, it presents three methods that allows to determinate where the systems are more efficient. It concludes that evaporative cooling systems have a very large potential to propitiate thermal comfort and can still be used as an alternative to conventional systems in regions where the design wet bulb temperature is under 24ºC.

Published
2008
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3. Efeitos da climatização do curral de espera na produção de leite de vacas holandesas Effects of the climatization of the corral of wait on milk production of holstein cows

Author

Iran J.O. da Silva, Héliton Pandorfi, Irineu Acararo Jr., Sônia M.S. Piedade, and Daniella Jorge de Moura

Subjects
conforto térmico, leite, resfriamento evaporativo, thermal comfort, milk, evaporative cooling, Animal culture, SF1-1100
Abstract

O presente estudo foi conduzido com o objetivo de avaliar os efeitos da climatização de ambientes em condições de pré-ordenha na produção de leite. O experimento foi realizado na fazenda experimental do Instituto de Zootecnia, em Nova Odessa, SP, durante doze dias consecutivos do verão de 1999. Foram analisados os efeitos do sistema de resfriamento evaporativo (SRE), por nebulização, no curral de espera. Utilizaram-se doze animais da raça holandesa, divididos em dois grupos de seis animais, onde apenas o segundo grupo foi submetido ao sistema de climatização. Os dados ambientais foram registrados no horário das ordenhas, ou seja, às 7 e 15 h. Para avaliação dos dados ambientais utilizaram-se os índices de conforto térmico: índice de temperatura de globo (WBGT), índice de temperatura e umidade (THI) e índice de carga térmica radiante (CTR). As respostas fisiológicas, como freqüência cardíaca e respiratória, temperatura retal e produção de leite também foram consideradas variáveis de resposta. Conclui-se que o efeito do resfriamento do ambiente é mais significativo no horário da segunda ordenha (15 h), quando comparado ao da primeira (7 h), melhorando as condições de conforto térmico no curral de espera, refletindo em um aumento de 7,28% na produção de leite, além de promover redução na frequência respiratória e cardíaca.This work was carried out to evaluate the effect of the climatization of environments in daily pay-milking conditions. The experiment was carried out in the experimental farm of the Institute of Zootecnia, in Nova Odessa, SP, during twelve consecutive days of the summer. The effects of the system of evaporative cooling (SRE), by fogging in the wait corral and milking room were analyzed. Twelve Holstein cows were divided in two groups, where only the second group had passed climatization. Data environment were recorded at 7:00 am and 3:00 pm. For evaluation of the ambient data, index of thermal comfort, index of globe temperature (WBGT), temperature humidity index (THI) and index of radiant thermal load (CTR) were used. The physiolological responses as cardiac frequency, respiratory frequency, retal temperature and production had been also considered variable responses. It was concluded that the effect of cooling of the environment is more significant in the schedule of second milking (3:00 pm) when compared to the of the first one (7:00 am), improving the conditions of thermal comfort in the wait corral, contemplating in an increase of 7,28% in the production of milk, besides promoting a reduction in the breathing and heart frequency.

Published
2002
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4. Evaluación de la eficiencia de la energía de equipos de enfriamiento evaporativos en diferentes condiciones climáticas

Author

Cardona, Iván, Parejo, Robert, and Jesús David Rhenals Julio

Subjects
Evaporative cooling, Condiciones ambientales, Enfriamiento evaporativo, EES software, Energy improvements, Environmental conditions, Software EES, Mejoras energeticas
Abstract

In this research, a study was developed of the effect of climatic conditions on the performance of evaporative equipment located in the city of Montería, using the EES software in which the various modeling of ambient temperature, relative humidity and air velocity were carried out. air. The development of this strategy begins with the characterization of available evaporative cooling equipment, as a second instance the identification of the climatic variables that influence the system, the third section is the selection of an equipment based on the environmental conditions, the fourth section is the Carrying out the simulation of the equipment varying these conditions and finally giving the conclusions and recommendations for the system. AGRADECIMIENTOS ................................................................................................................. 2 RESUMEN .................................................................................................................................... 5 INTRODUCCIÓN ......................................................................................................................... 6 OBJETIVOS .................................................................................................................................. 7 DESARROLLO DEL TEMA ......................................................................................................... 8 1. Equipos evaporativos.......................................................................................................... 8 1.1. Eficiencia energética en HVAC................................................................................... 8 2. Características de Montería................................................................................................. 9 2.1. Condiciones climáticas ............................................................................................... 9 2.2. Consumo de energía.................................................................................................. 10 ESTADO DEL ARTE .................................................................................................................. 11 METODOLOGÍA ........................................................................................................................ 13 3. Influencia de las condiciones climáticas ............................................................................ 13 4. Condiciones experimentales ............................................................................................. 14 5. Modelo matemático .......................................................................................................... 16 RESULTADOS ........................................................................................................................... 20 CONCLUSIONES ....................................................................................................................... 25 BIBLIOGRAFIA ......................................................................................................................... 26 ANEXOS..................................................................................................................................... 30 En la presente investigación se desarrolló un estudio de la afectación de las condiciones climáticas en el rendimiento de equipos evaporativos situados en la ciudad de Montería, utilizando el software EES en el cual se realizaron las diversas modelaciones de la temperatura ambiente, humedad relativa y velocidad del aire. El desarrollo de esta estrategia inicia con la caracterización de equipos de enfriamiento evaporativo disponibles, como segunda instancia la identificación de las variables climáticas que influyen en el sistema, tercera sección es la selección de un equipo en base a las condiciones ambientales, cuarta sección es la realización de la simulación del equipo variando dichas condiciones y por último dar las conclusiones y recomendaciones para el sistema. Pregrado Ingeniero(a) Mecánico(a) Monografías

Published
2021

5. Simulación Dinámica y Estudio Comparativo de diferentes Configuraciones de Sistemas de Enfriamiento Evaporativo para Mexicali, México

Author

Gallegos, Ricardo O, Velázquez, Nicolás L, and Luna, Aníbal L

Subjects
climatic data, simulación dinámica, air conditioning, dynamic simulation, enfriamiento evaporativo, datos climatológicos, evaporative cooling, solid desiccant systems, desecante sólido, climatización
Abstract

Se ha realizado el dimensionamiento y evaluación de diferentes configuraciones de sistemas de enfriamiento evaporativo para acondicionamiento de espacios en vivienda de tipo económico para Mexicali, México, mediante simulación con TRNSYS 16. Se analizan configuraciones que incluyen intercambiadores de calor, enfriadores evaporativos indirectos y unidades de desecante sólido. Los principales criterios para clasificar las distintas configuraciones fueron el confort térmico, el número de componentes y la eficiencia. Los resultados muestran que la configuración que incluye un intercambiador que pre-enfría el aire con el proveniente de la vivienda, es capaz de proporcionar condiciones de confort con el menor número de componentes, aunque en una pequeña fracción del tiempo durante el día no se satisfacen totalmente. Si se requiere satisfacer totalmente el confort, los sistemas con desecante sólido son la opción más adecuada. The design and evaluation of several configurations of evaporative cooling systems for air conditioning of a dwelling for low-income sectors in Mexicali, Mexico using simulation with TRNSYS 16.A is presented in this paper. The configurations studied include direct as well as indirect evaporative cooling with heat exchange and also systems with solid desiccant. The main rating parameters to classify the different configurations are the internal comfort conditions, the efficiency and the number of required equipments. The results show that the best configuration is one that includes a heat exchanger that pre-cools the air inlet stream with a cooling stream delivered by air coming from the dwell, but there is a small fraction of the time during the day that comfort is not met. If thermal comfort is to be met during the whole day, solid desiccant systems are the best choice.

Published
2010

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