Performance characterization of a direct evaporative cooling pad based on pottery material

Laknizi, Azzeddine; Abdellah, Abdellatif Ben; Faqir, Mustapha; Essadiqi, E.; Dhimdi, Said

doi:10.1080/19397038.2019.1677800

Cited by 21 publications

(15 citation statements)

References 23 publications

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“…Most works gathered in Table 3 as providing the operating hygrothermal air conditions (DBT and WBT or RH) do not actually control these factors, and simply measure their variation with time [30,38,51,[58][59][60][61]63,64,68,73,[87][88][89][90][91]94]. Indeed, only a few deliberate on their effect on the DEC behavior.…”

Section: Inlet Air Psychrometric Conditionsmentioning

confidence: 99%

“…High air velocities have been repeatedly correlated to lower saturation effectiveness [16,33,40,46,48,53,61,65,69,[74][75][76]94,96], temperature drop [42,75,91] and relative humidity variation [42,53,91], but also to larger pressure drops [15,31,39,41,46,48,96], water consumption [3,15,31,39,40,42,46,75,91], as well as heat and mass transfer coefficients [3,15,61].…”

Section: Air Velocity/flow Ratementioning

confidence: 99%

“…Another unarguably point is the effect of the air velocity on the saturation effectiveness, which is in fact defined as the "common point for all direct evaporative cooling pads" by Laknizi et al [91]. Indeed, it is concluded from the ANOVA developed by De Melo et al [79] that the air velocity is determinant on the saturation effectiveness.…”

Section: Air Velocity/flow Ratementioning

confidence: 99%

“…Some authors [31,75] obtain better COPs as the air velocity increases; indeed, Nada et al [42] obtain the maximum COP at air velocity 2.2 m s − 1 . However, the COP may not be clearly related to the air velocity due to the additional fan needs [91], which can even result into worse COPs [52]. Many works provide recommended values for the air velocity, generally towards a balanced saturation effectiveness face to the pressure drop.…”

Section: Air Velocity/flow Ratementioning

confidence: 99%

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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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Section: Inlet Air Psychrometric Conditionsmentioning

confidence: 99%

Section: Air Velocity/flow Ratementioning

confidence: 99%

Section: Air Velocity/flow Ratementioning

confidence: 99%

Section: Air Velocity/flow Ratementioning

confidence: 99%

See 2 more Smart Citations

Optimal operation of evaporative cooling pads: A review

Tejero‐González

Franco-Salas

2021

Renewable and Sustainable Energy Reviews

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“…Wood chips were found as the best cooling pad material in direct evaporative cooling mode, which reduced the air temperature by 10.6 • C on average and has wet-bulb effectiveness of 81%. In another research work conducted by Laknizi et al [27], pottery rods were selected as the cooling pad material. The temperature reduction, saturation efficiency, cooling capacity and COP are 7 • C, 65.87%, 539.7 W and 8.8, respectively.…”

Section: Direct Evaporative Cooling (Dec)mentioning

confidence: 99%

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

et al. 2021

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Evaporative cooling technology (ECT) has been deemed as an alternative to the conventional vapor-compression air conditioning system for dry climates in recent years due to its simple structure and low operating cost. Generally speaking, the ECT includes two types of different technologies, direct evaporative cooling (DEC) and indirect evaporative cooling (IEC). Both technologies can theoretically reduce the air temperature to the wet-bulb temperature of outdoor air. The major difference between these two technologies is that DEC will introduce extra moisture to the supply air while IEC will not. The enhanced IEC, Maisotsenko-cycle (M-cyle) IEC, can even bring down the air temperature to the dew point temperature. The ECT integrated with solid desiccant systems, i.e., solid desiccant-assisted evaporative cooling technologies (SDECT), could make the technology applicable to a wider range of weather conditions, e.g., weather with high humidity. In this paper, the recent development of various evaporative cooling technologies (ECT), solid desiccant material and the integration of these two technologies, the SDECT, were thoroughly reviewed with respect to their configuration, optimization and desiccant unit improvement. Furthermore, modeling techniques for simulating SDECT with their pros and cons were also reviewed. Potential opportunities and research recommendations were indicated, which include improving the structure and material of M-cycle IEC, developing novel desiccant material and optimizing configuration, water consumption rate and operation strategy of SDECT system. This review paper indicated that the SDECT system could be a potential replacement for the conventional vapor-compressed cooling system and could be applied in hot and humid environments with proper arrangements.

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Direct evaporative cooling from wetted surfaces: Challenges for a clean air conditioning solution

Tejero‐González

Franco-Salas

2021

WIREs Energy & Environment

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Evaporative cooling has a major role to play in fighting climate change and in achieving a low‐carbon economy. As it helps to reduce energy demand for air conditioning, it is gaining attention in terms of improving energy efficiency in buildings. Evaporative cooling from wetted media can enhance water–air contact, thereby improving heat and mass transfer further and avoiding aerosols. Wetted media are commonly called evaporative cooling pads and are widely used in greenhouses, intensive livestock farming, and industrial facilities. However, a deep understanding of evaporative cooling pad performance can enhance their application to indoor occupied spaces such as residential or commercial cooling, or in hybrid air conditioning systems. Most studies analyze pad performance mainly in terms of pressure drop and saturation effectiveness. However, some studies propose alternative cooling efficiency parameters and others provide insights into key aspects such as power requirements and the coefficient of performance, water consumption, risk of water entrainment, material decay, and air quality, as well as the effect of water temperature and salinity, solar radiation, or wind speed. Existing results on these less studied performance issues are reviewed, and we identify the gaps in the literature in addition to highlighting the main challenges encountered, in an effort to guide future researchers in the field and enhance the application of direct evaporative cooling. This article is categorized under: Energy Efficiency > Systems and Infrastructure Energy Systems Analysis > Systems and Infrastructure

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Performance characterization of a direct evaporative cooling pad based on pottery material

Cited by 21 publications

References 23 publications

Optimal operation of evaporative cooling pads: A review

Optimal operation of evaporative cooling pads: A review

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

Direct evaporative cooling from wetted surfaces: Challenges for a clean air conditioning solution

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