Direct evaporative cooling performance of ambient air using a ceramic wet porous layer

Sellami, Karima; Feddaoui, M’barek; Labsi, Nabila; Najim, Monssif; Oubella, Mhand; Benkahla, Youb Khaled

doi:10.1016/j.cherd.2018.12.009

Cited by 25 publications

(6 citation statements)

References 52 publications

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“…It was found that, the more the porosity of the material, the more the evaporation rate is. This result can be justified by the fact that the increase of the porosity increases the permeability of the porous medium, allowing the liquid to permeate faster [11]. As observed in the variance, red clay has close relationship and white clay has slight relationship while plaster has no relationship at all with human sweat evaporation rate.…”

Section: Relationship Between Human Sweat and Porous Materials Evapmentioning

confidence: 85%

“…Porosity is defined as the ratio of volume of pores to the total volume of the material [11]. The purpose of the porosity test is to find to the porosity level and the effect of pores to this study.…”

Section: B Porosity Of the Materialsmentioning

confidence: 99%

“…The purpose of the porosity test is to find to the porosity level and the effect of pores to this study. Water Saturation Method is used to calculate the porosity percentage [11]. Table 4 shows the average of each porous material that using throughout the study.…”

Section: B Porosity Of the Materialsmentioning

confidence: 99%

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The Suitability of Porous Material to Simulate Evaporation in Human Sweating Mechanisms

Kelundapyan,

Yong,

Zakaria

et al. 2020

IJEAT

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Abstract: This study aims to determine the suitable porous material that can simulate human sweat evaporation rate for preliminary thermal comfort assessment. The objective of the study was to identify the relationship of human sweat evaporation rate with porous material evaporation rate. Field experimental has been conducted to measure the evaporation rate of porous material such as red clay, white clay, plaster and human sweat. Then, the correlation analysis was conducted between porous material evaporation rate and human sweat evaporation rate. The collected data were analyzed by using SPSS 20 and Microsoft Excel 2016 tools. Pearson correlation were used as statistical analysis to find the relationship between both variable. The statistical significance level was set at P< 0.01. Based on the findings, human sweat evaporation rate had a moderate correlation with red clay (r = 0.583) and white clay (r = 0.503) with statistically significant but very weak correlation with plaster (r = 0.020). The porous characteristics of red clay and white clay has the capillary effect which is almost like human skin by showing a good correlation between human sweat and porous material evaporation rate. As this is preliminary study, in future more research to be done to obtain higher correlation between porous material and the human body by modifying the material. To minimize heat stress, it would be a step forward in evaluating outdoor thermal comfort and raising awareness of society and government.

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Section: Relationship Between Human Sweat and Porous Materials Evapmentioning

confidence: 85%

Section: B Porosity Of the Materialsmentioning

confidence: 99%

See 1 more Smart Citation

The Suitability of Porous Material to Simulate Evaporation in Human Sweating Mechanisms

Kelundapyan,

Yong,

Zakaria

et al. 2020

IJEAT

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“…Neglecting air humidity can lead to incomplete analysis. Optimization of water flow rates should consider factors such as air velocity, psychrometric conditions, pad material, and salt deposition risks (Fouda and Melikyan, 2011;Sellami et al, 2019a;Sellami et al, 2019b;Laknizi et al, 2021a).…”

Section: Figurementioning

confidence: 99%

Examining the efficacy of cooling pad technology to address increasing building cooling demand in Latvia

Prozuments,

Borodinecs,

Lebedeva

et al. 2023

Front. Built Environ.

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Over the past decades there has been a strong evidence of a temperature rise across the world that has led to a growing concern of more extreme weather patterns and regular seasonal heat waves globally. As such, building occupants are at a continuously growing risk to overheating exposure inside the premises throughout the warm season of the year. This study investigates the utilization of cooling pad technology as a potential solution to enhance cooling efficiency. Compared to traditional cooling methods, the implementation of cooling pads leads to significant reductions in temperature and enhanced humidity control, while consuming relatively lower amounts of energy. The study contains a comprehensive analysis of the climatic conditions in Latvia, focusing on temperature and humidity variations throughout the year over the last decade in three cities–Riga, Daugavpils and Liepaja, that extensively represent the scope of climatic variations across Latvia, featuring coastal and continental climate patterns. This study aims to evaluate the effectiveness and suitability of cooling pad technology in Nordic climate, focusing on three Latvian cities. The novelty of the study lies in its analysis of cooling pad technology’s effectiveness in Nordic climatic conditions in addressing the increasing cooling demand. The paper examines the fundamental principles behind cooling pad technology, its impact on chiller performance, and its ability to optimize the cooling process. The utilization of cooling pad technology as an effective means to enhance cooling efficiency across the building stock to improve occupant comfort level and IEQ is highlighted. The results demonstrate 5.47% COP increase during average summer temperature conditions, and 17.78% COP increase in peak summer temperature conditions after implementation of cooling pads. This study contributes to the existing knowledge on cooling technologies, offering practical recommendations for the implementation of cooling pad systems use in Latvia and across the wider Nordic region, which is experiencing the gradual rise in summer temperature and humidity level.

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“…Condensers are indispensable components of cooling systems, with vapor, water, and air condensers being among the various types available. Smaller refrigeration systems, like chillers, typically utilize air-cooled condensers up to about 20 tons [14], [15]. Heat transfer in air-cooled condensers occurs between coils and the ambient air, operating based on the principles of thermal transfer governed by air physics.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of integrating an air conditioner with an evaporative air cooler

Mumtaz,

Hammdi

2024

Heritage and Sustainable Development

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During the summer, air conditioning is increasingly used in commercial and residential structures to provide thermal comfort. The elevated condenser pressure caused by high ambient temperatures has led to a significant increase in electricity consumption in dry, hot climates. Therefore, this article presents the results of a numerical simulation investigation into the feasibility of enhancing the performance of a conventional air conditioning unit by applying a direct evaporative cooling system. The objective is to increase the cooling capacity while decreasing power consumption. The program used a small window-type air conditioner configured to simulate various weather conditions. The numerical findings indicate that incorporating evaporative cooling aids improved the system's ability to overcome numerous obstacles, resulting in a 10–20% increase in refrigeration capacity. Additionally, power consumption was reduced by approximately 3%, and the discharge temperature fell by 6–10°C. The predicted mean vote standard (PMV) for thermal conditions for human occupants yielded favorable outcomes (normal-type). Despite the challenging climate conditions prevailing during the five sweltering summer months, water production demonstrated good results, particularly in September.

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Direct evaporative cooling performance of ambient air using a ceramic wet porous layer

Cited by 25 publications

References 52 publications

The Suitability of Porous Material to Simulate Evaporation in Human Sweating Mechanisms

The Suitability of Porous Material to Simulate Evaporation in Human Sweating Mechanisms

Examining the efficacy of cooling pad technology to address increasing building cooling demand in Latvia

Numerical simulation of integrating an air conditioner with an evaporative air cooler

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