A sustainable localised air distribution system for enhancing thermal environment and indoor air quality of poultry house for semiarid region

Assaad, Douaa Al; Orabi, Mohamad S.; Ghaddar, Nesreen; Ghali, Kamel; Salam, Darine A.; Ouahrani, Djamel; Farran, M. T.; Habib, Rima R.

doi:10.1016/j.biosystemseng.2021.01.002

Cited by 17 publications

(7 citation statements)

References 32 publications

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“…Note that well-mixed conditions were considered, which is a valid assumption for smaller poultry house establishments. 24 Due to the variation of the ambient temperature and RH levels, the operation of both standalone DEC and hybrid systems in the natural and mixed ventilation modes differs. Thus, in order for the systems to meet the space requirements at minimal water and electricity cost, motorized dampers control the bypass fraction on the DEC in order to provide the optimal operating conditions ( _ m sup , β) on an hourly basis for both stand-alone DEC and hybrid EAHE/DEC systems.…”

Section: System Descriptionmentioning

confidence: 99%

“…A 50-mm layer of pine nut shavings lined the floor, serving as a bedding material for the laying hens. The detailed composition of the envelope (material density, specific heat, and convective heat transfer coefficient) can be seen in Ref.. 24 Table 1 presents the heat load generated by the hens as well as the pollutants generated due to their respiratory activities (CO 2 ) and water vapor (H 2 O) and manure (NH 3 ).…”

Section: System Descriptionmentioning

confidence: 99%

“…Note that well‐mixed conditions were considered, which is a valid assumption for smaller poultry house establishments 24 . Due to the variation of the ambient temperature and RH levels, the operation of both stand‐alone DEC and hybrid systems in the natural and mixed ventilation modes differs.…”

Section: System Descriptionmentioning

confidence: 99%

“…They found that the DEC was not efficient during summer afternoons, where indoor temperatures peaked beyond 28°C and RH beyond 80% above the allowed maxima. In a recent study, Al‐Assaad et al 24 have coupled the conventional DEC with tunnel ventilation in the Beqaa region of Lebanon characterized by semiarid climate. Similar to Ref., 23 they found that while indoor temperatures did not go above 25°C, the indoor RH levels exceeded their maximum allowable limit throughout most of the cooling season and reached a maximum value of 86.7% during the peak month of July.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and optimization of poultry house passive cooling strategies in semiarid climates

Harrouz

Assaad

Orabi

et al. 2021

Intl J of Energy Research

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Meeting hygrothermal and air quality requirements in livestock dwellings is crucial for upholding production quality standards. However, ventilation and air-conditioning in such enclosures is very energy-intensive, especially amidst climate change and intensifying summer conditions. This is due to large surface areas, livestock densities, and contaminants' generation rates. Hence, striving for more efficient passive cooling techniques is always a desired goal to reduce the anthropogenic emissions of the agricultural sector without compromising production quality. In this study, the energy savings' potential of two passive systems in a poultry house located in the semiarid climate of Beqaa Valley, Lebanon, was compared. The first system is the conventional stand-alone direct evaporative cooler (DEC), which evaporatively cools the outdoor clean air to temperatures close to its wet bulb. The second system combines with the DEC, an earth-to-air heat exchanger (EAHE) that sensibly

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Section: System Descriptionmentioning

confidence: 99%

Section: System Descriptionmentioning

confidence: 99%

Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and optimization of poultry house passive cooling strategies in semiarid climates

Harrouz

Assaad

Orabi

et al. 2021

Intl J of Energy Research

Self Cite

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“…When evaporatively cooled air is directly driven to the occupied spaces, it is called Direct Evaporative Cooling (DEC). DEC systems are widely used in applications such as greenhouses [4], intensive livestock farming [5], industrial facilities [6] and urban outdoor spaces [7,8].…”

Section: Introductionmentioning

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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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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A sustainable localised air distribution system for enhancing thermal environment and indoor air quality of poultry house for semiarid region

Cited by 17 publications

References 32 publications

Modeling and optimization of poultry house passive cooling strategies in semiarid climates

Modeling and optimization of poultry house passive cooling strategies in semiarid climates

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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