Green Material Prospects for Passive Evaporative Cooling Systems: Geopolymers

Emdadi, Zeynab; Yarmo, Mohd Ambar; Shamsudin, Roslinda; Mohammad, Masita; Sopian, Kamaruzzaman

doi:10.3390/en9080586

Cited by 17 publications

(11 citation statements)

References 93 publications

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“…The fact that liquids absorb heat to evaporate has been used for thousands of years for air conditioning, at least as long ago as in ancient Egypt, Persia, and India. 11 In cosmetics, this short-term effect appears to disappear after 5-15 min.…”

Section: Resultsmentioning

confidence: 99%

Infrared assessment of human facial temperature in the presence and absence of common cosmetics

Zheng

Dong

Wang

et al. 2020

Preprint

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Using a sensitive research-grade infrared camera, we find that common facial cosmetics and lotions mask skin temperature in assays of the human forehead. We test a family of 10 commonly-used cosmetic products and find that volatile liquids and creams lower thermal skin temperature by at least 2 C for up to 5-10 min and at least 1 C for up to 20 min, respectively. Powder and cream that contains brightening agent lower indefinitely the skin temperature sensed by infrared camera. With the qualification that these experiments were performed in a controlled laboratory setting rather than the mass crowd screening environment where infrared temperature sensing of humans sees widespread use, our tests suggest that for human subjects whose face was treated with certain cosmetics and lotions, infrared-based screening for elevated facial temperature (fever) can be unreliable.

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Section: Resultsmentioning

confidence: 99%

Infrared assessment of human facial temperature in the presence and absence of common cosmetics

Zheng

Dong

Wang

et al. 2020

Preprint

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“…Evaporative cooling from wetted media has been subject of different review articles, generally as part of a wider approach covering different evaporative cooling technologies and sometimes focused on their applicability in buildings, specially intensive farm buildings, and greenhouses [4,6,[17][18][19][20]. Materials used in direct evaporative cooling systems are also the target of existing review works [21][22][23].…”

Section: Justification and Objectivesmentioning

confidence: 99%

Optimal operation of evaporative cooling pads: A review

Tejero‐González

Franco-Salas

2021

Renewable and Sustainable Energy Reviews

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Direct evaporative cooling is widely known for being an energy efficient air conditioning solution for arid and/or semi-arid climates. Commercialized evaporative cooling pads vary in material and construction characteristics, while existing research proposes several alternative wetted media and configurations. The most studied factors on the evaporative cooling pads operation are the air velocity or air mass flow rate, air psychrometric conditions; the pad thickness, its geometric characteristics and configuration, and the water flow rate supplied. The pads performance is commonly characterized through its saturation effectiveness, pressure drop, temperature drop and humidity increase achieved in the treated air, water evaporation and consumption, cooling capacity, coefficient of performance and the heat and mass transfer coefficients. Present work conducts a critical review on the existing experimental and theoretical research on commercial and alternative wetted media, identifies the gaps in the literature, proposes uniform nomenclature and methodologies, and provides a critical view on the optimal operating conditions from wetted-surface evaporative coolers.

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“…Their efficiency is increased at low air face velocity (Parks et al 2003). Geo-polymers (inorganic material) can be used as evaporate cooling pads due to their high water retention, good cooling effect, and their excellent capillary lift of water (Emdadi et al 2016). The cooling pads are normally wall mounted.…”

Section: Greenhouse Evaporative Cooling Systemmentioning

confidence: 99%

Experimental and numerical investigation of the thermal performance of evaporative cooled greenhouses in hot and arid climates

Ghаni

El-Bialy

Bakochristou

et al. 2019

Science and Technology for the Built Environment

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The controlled microclimate of greenhouses is vital for producing quality yield. This paper investigates the thermal performance of an evaporative cooled greenhouse operating in Qatar. Three design factors affecting the greenhouse thermal performance were assessed, namely the greenhouse geometry, operational parameters, and its geographical location. Geometrical parameters include induction fan elevation, roof shape, and aspect ratio. Operational parameters refer to the air flowrate. The greenhouse location dictates the incident solar intensity that was studied. Computational Fluid Dynamics (CFD) was used to model a typical ASHRAE compliant greenhouse. The simulation results were validated using measured data of a greenhouse inner air temperature, relative humidity, and the global incident solar radiation, showing good agreement. Simulation results showed that induction fans located at or below the crop height resulted in lowering the average temperature of the greenhouse. Doubling of the greenhouse ventilation rate from 20 ACH to 40 ACH further decreased the greenhouse air temperature. Temperature rise due to high incident solar radiation is reduced by increasing the ventilation rates. The uneven span greenhouse roof shape resulted in the lowest average inner temperature. For the same greenhouse floor area and volume, the effect of the aspect ratio showed negligible differences.

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Green Material Prospects for Passive Evaporative Cooling Systems: Geopolymers

Cited by 17 publications

References 93 publications

Infrared assessment of human facial temperature in the presence and absence of common cosmetics

Infrared assessment of human facial temperature in the presence and absence of common cosmetics

Optimal operation of evaporative cooling pads: A review

Experimental and numerical investigation of the thermal performance of evaporative cooled greenhouses in hot and arid climates

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