Evaporative Mist Cooling as Heat Dissipation Technique: Experimental Assessment and Modelling

Delgado, MCarmen Guerrero; Ramos, José Sánchez; Domínguez, Servando Álvarez; Ulloa, Francisco Toral; Ríos, José Antonio Tenorio

doi:10.3390/app10176026

Cited by 5 publications

(6 citation statements)

References 49 publications

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“…The air temperature in open spaces is reduced through natural conditioning techniques that sustainably achieve thermal comfort goals. Nature-based techniques involve the use of environmental heat sinks [35] such as the air, the ground and the sky, and the primary technology highlighted in the literature consists of the use of underground pipes [36], evaporative cooling [37] and/or radiative cooling [38].…”

Section: Climate Control Of Outdoor Spacesmentioning

confidence: 99%

Climatic Control of Urban Spaces Using Natural Cooling Techniques to Achieve Outdoor Thermal Comfort

et al. 2022

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The open spaces of cities have become hostile to citizens due to the high temperatures. Lack of thermal comfort hampers outdoor activities. It is imperative to combat these phenomena to bring life back to the streets and make spaces frequently used in the past more appealing to local citizens. The aim is to mitigate the severity of the outdoor climate to reach comfortable conditions in open spaces. For that, microclimate control based on natural cooling techniques is proposed to recover the habitability of these spaces of the cities. These techniques are characterised via experiments. Demostrando como es posible conseguir and integrated using simulation tools. Following this methodology, it is possible to design, size and define operation strategies for the ideal climate control system according to the type of need. This paper addresses a degraded and unused real space as a case study to demonstrate the feasibility of the methodology used. A system has been designed that stores water cooled at night by using the sky and night air and uses it during the day to produce cold air and cool cover. The experimental results test the efficiency of each solution that has been integrated into the complete system. The system operates every technology to keep the temperature radiant and the air of the occupants cool. For it, falling-film technology cools every night a volume of water below 18 °C and dissipation in a water pond by water sprinkler maintains a pond 10–15 °C below the outside air temperature. Also, results test how it is possible to guarantee thermal comfort conditions (operative temperature below of 28 °C) even when the environment surrounding the conditioned volume is at temperatures above 40 °C, and how the seismic allows maintaining these conditions during the worst summer hours. In conclusion, microclimate control allows for mitigating the severity of the outdoor climate to reach a degree of thermal comfort equivalent to that in enclosed venues.

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Section: Climate Control Of Outdoor Spacesmentioning

confidence: 99%

Climatic Control of Urban Spaces Using Natural Cooling Techniques to Achieve Outdoor Thermal Comfort

et al. 2022

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“…Finally, and in general, the temperature reduction was achieved by driving cold air into the space to be conditioned, where the air was cooled through environmental heat sinks [23] and therefore had a higher temperature than cold air used in conventional building conditioning. The use of a natural sink for air cooling is possible with known techniques such as evaporative cooling [24] and innovative systems such as the "falling-film system" [25].…”

Section: Bioclimatic Techniquesmentioning

confidence: 99%

Adaptative Cover to Achieve Thermal Comfort in Open Spaces of Buildings: Experimental Assessment and Modelling

et al. 2021

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The global need for healthy and safe open spaces faces continuous temperature rise due to the heat island phenomenon and climate change. This problem requires new strategies for improving the habitability of open spaces (indoor and outdoor conditions in buildings). These techniques include reducing solar radiation, reducing the temperature of surrounding surfaces, and reducing the air temperature. The radiant solutions are essential for outdoor comfort, both in summer and in winter. They are easy to integrate into open spaces. This study explores a new concept of radiant solutions adapted for outdoor spaces. The solution was evaluated in a test cell to obtain its thermal behaviour in different operation conditions. Solutions were optimised for operating in a cooling regimen since it has been identified that the demands for comfort in open spaces in hot climates during the most severe summer months are more pronounced. Experimental results have allowed getting an inverse model to analyse the thermal behaviour of the solution. The inverse model achieved high precision in its estimations. Also, it facilitated knowing the radiant and convective effects. Only the radiant heat flux is relevant in open spaces with a low level of air confinement. Finally, the discussion describes the application of the proposed model. The model allows the replicability of the solution—creating new designs (integration) or evaluating into different operating conditions of the system. This discussion demonstrates the high level of knowledge acquired in the characterisation of the solution studied.

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“…Recent studies have shown that if temperatures arose as predicted, worldwide residential energy consumption for cooling will be up to 34% higher than at present in 2050 and 2100 up to 61% greater [19]. Now we need to make our systems as efficient as possible to meet the growing energy demands without creating any extra carbon foot print and climate change [7]. Various techniques to increase the COP of refrigeration cycle are air cooled; water cooled evaporatively cooled condensers and compressor shell and use of high conductivity nano materials to increase the heat transfer coefficient [1].…”

Section: Introductionmentioning

confidence: 99%

“…Burning fossil fuels creates the global warming, climate change and deforestation [10]. This in turn creates the demand of cooling and refrigeration systems [7]. Throughout the development path of sciences various methods of cooling, refrigeration and air conditioning viz.…”

Section: Introductionmentioning

confidence: 99%

“…Above techniques of COP increment are studied and reviewed, in this review paper we have evaluated numerous works done in improving the energy efficiency of domestic refrigerators through various techniques. Now the demand of energy is growing exponentially and we must search new ways/resources to meet the energy demands, but merely searching for new resources can't meet the requirement until we make systems more energy efficient [7].…”

Section: Introductionmentioning

confidence: 99%

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A Review of Literature on Various Techniques of COP Improvement in Vapor Compression Refrigeration System

Mishra¹

2021

IJRASET

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This review paper is a study on various methods of performance improvement in domestic refrigeration systems, based on the vapor compression refrigeration VCRS cycle. Here air-cooled, water-cooled, fog cooled, evaporatively cooled condensers and nano-fluid lubricant /coolant methods their working and efficiency are reviewed, compared, analyzed and presented. The paper inspects the work done by different researchers for the maximization of heat loss from condenser & compressor and bringing about necessary modifications to reduce the overall power consumption of domestic refrigerators by improving Coefficient of Performance (COP). Numerous works have been done on improving the heat dissipation capacity of condenser but using nano-fluid in lubricant base as refrigerant and in the compressor shell as coolant is a new technology. Nano-fluid increase heat transfer due the high conductivity nano particles. It has been observed that water cooled condensers and compressors with nano-lubricants/coolants give the best performance improvements but they suit better for big or large refrigeration systems like centralized air conditioning systems or cold storage warehousing, whereas air cooled and evaporative condensers are optimal for small scale or low power appliances like domestic refrigerators, water coolers or split air conditioners to reduce overall power consumption by increasing the COP. Keywords: Refrigeration system, COP improvement, Condenser, Water mist, Evaporative cooling, Nano-fluid coolant, VCRS cycle.

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Evaporative Mist Cooling as Heat Dissipation Technique: Experimental Assessment and Modelling

Cited by 5 publications

References 49 publications

Climatic Control of Urban Spaces Using Natural Cooling Techniques to Achieve Outdoor Thermal Comfort

Climatic Control of Urban Spaces Using Natural Cooling Techniques to Achieve Outdoor Thermal Comfort

Adaptative Cover to Achieve Thermal Comfort in Open Spaces of Buildings: Experimental Assessment and Modelling

A Review of Literature on Various Techniques of COP Improvement in Vapor Compression Refrigeration System

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