An experimental study on the design, performance and suitability of evaporative cooling system using different indigenous materials

Alam, Md. Ferdous; Sazidy, Ahmad Sharif; Kabir, Asif; Mridha, Gowtam; Litu, Nazmul Alam; Rahman, Ashiqur

doi:10.1063/1.4984704

Cited by 16 publications

(9 citation statements)

References 6 publications

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“…From Table 1, increase in evaporative pad size increased the saturation efficiency except for khus pads. In line with the observations of [37] , [39]compared the performance of evaporative pads made of cocnut noir pads, sackcloth pads,and jute fiber pads as alternative pad materials and observed that the pad made of coconut noir gave the highest maximum cooling efficiency of 85%bagainst jute fiber (78%) and sackcloth(69%). The cocnut noir pad also gave a minimum water mass flow rate of 0.25kg/sec and a maximum air velocity of 5.6ms -1 .…”

supporting

confidence: 82%

A review of common natural ventilation and evaporative cooling systems for Greenhouses and the Nigerian reality

Ikechukwu-Edeh¹,

Ndukwu²,

Ahaneku³

2021

Poljoprivredna tehnika

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Greenhouses simulate the "desired" environment for successful growth and development of plants. They, by design, achieve this desired environment by supplying the necessary climatic inputs needed by the plants to strive and at the same time exclude factors impeding the growth of plants, hence it is called a controlled environment. One of the common and most desired attribute of the greenhouse is its ability to provide effective cooling to the plants. This paper reviewed, extensively, the concept of evaporative cooling as applied in greenhouses. Factors like Vapor Pressure deficit (VPD), Relative Humidity, Ambient Temperature were also discussed with regards to its effects on the efficiency of the evaporative cooling system. The efficiencies of the Fan and Pad System and the Fog systems were reviewed and compared with their consequent dependence on factors like nozzle spacing, nozzle length, saturation efficiency of pad material etc. The Natural Ventilation method was also reviewed as a "stand alone " greenhouse cooling method and as an augmentation to other cooling systems. Factors like rate of air exchange, total area of vents, wind speed, vent opening angles etc. were also discussed in line with their effects on the effectiveness of the Natural ventilation method. The Nigerian Perspective on Greenhouses and its Cooling methods was also discussed with reference to local development of evaporative coolers as well as its importation, its affordability, management, availability and appliance to the Nigerian farming culture.

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supporting

confidence: 82%

A review of common natural ventilation and evaporative cooling systems for Greenhouses and the Nigerian reality

Ikechukwu-Edeh¹,

Ndukwu²,

Ahaneku³

2021

Poljoprivredna tehnika

View full text Add to dashboard Cite

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“…According to the definition of the cooling capacity (equation ( 4)), larger pad thickness would also result into better cooling capacity, as observed by Nada et al [42]. Similar results were obtained for fiber pads [13,25] and fill pads like PVC sponge [76], high-density polyethylene mesh [16], or clay [14].…”

Section: Pad Geometric Characteristics and Configurationsupporting

confidence: 64%

“…Comparing different alternative vegetable fibers to the commercial aspen fiber pads, Al-Sulaiman [73] concluded that jute and luffa can provided better saturation effectiveness than the commercial aspen fibers, though that of palm fibers was worse, but that lifetime of jute was a drawback. Better saturation effectiveness than jute was obtained for coconut coir by Alam et al [25], who also characterized sack cloth pads, obtaining in that case the lowest saturation effectiveness. Coconut coir was also studied by Suranjan Salins et al [54], who compared it to wood shavings; in that case, coconut coir resulted into lower pressure drops but also much lower saturation effectiveness and COP.…”

Section: Pad Materialsmentioning

confidence: 89%

“…Because this parameter expresses a temperature drop, it is commonly called "cooling efficiency/effectiveness"; however, as the psychrometric evolution approaches saturation of air, it is also usually called "saturation efficiency/effectiveness". The terms "efficiency" and "effectiveness" are indeed indistinctively used, sometimes on purpose [17,24,25]. However, the use of the term "efficiency" may be misleading, and "effectiveness" could be more rigorous instead, as no conversion of energy forms is involved in the evaporative cooling phenomenon.…”

Section: Abbreviationsmentioning

confidence: 99%

“…For cellulose, 100 mm thick pads, operating at air velocities of 1-1.5 m s − 1 , Franco et al [41] observed a maximum increase in the pressure drop between 11.7% and 14.6% when the waterflow rate was duplicated from the recommended values by the ASABE [9]. More remarkable is the effect of water flow rate observed in pads made with alternative, vegetable fibers [25], though it was no contrasted to the effect of the air flow through the same pads. Indeed, for alternative pads made with porous stones [13] and bulk charcoal [96] it has a minor role compared to that of the air flow.…”

Section: Water 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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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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An experimental study on the design, performance and suitability of evaporative cooling system using different indigenous materials

Cited by 16 publications

References 6 publications

A review of common natural ventilation and evaporative cooling systems for Greenhouses and the Nigerian reality

A review of common natural ventilation and evaporative cooling systems for Greenhouses and the Nigerian reality

Optimal operation of evaporative cooling pads: A review

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

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