Computational modelling of thermal and humidity gradients for a naturally ventilated poultry house

Rojano, Fernando; Bournet, Pierre-Emmanuel; Hassouna, Mnasser; Robin, Paul; Kaçıra, Murat; Choi, Christopher Y.

doi:10.1016/j.biosystemseng.2016.09.012

Cited by 23 publications

(11 citation statements)

References 24 publications

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“…It is noted that quantify and determine the boundary conditions for an animal house could be a difficult task. According to related studies in the literature (Blanes-Vidal et al, 2008;Rojano et al, 2016;Rong et al, 2016;Bustamante et al, 2017), the general way to define the boundary conditions used in numerical study is based on experimental measurements at limited positions, which is considered to be appropriate and best possible approach. Therefore, in present study, the suspended ceiling, the floor, 2 side walls, the end and front walls were represented isothermally at a constant temperature calculated from the mean value of the surface temperature measurements as shown in Table 5.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…4 scenarios with different boundary settings for the inlet and outlet were investigated as there is no agreement in the literature on which combination of boundary conditions is best and different authors applied different boundary conditions for the inlet and outlet (Harral and Boon, 1997;Loomans, 1998;Bjerg et al, 2002;Blanes-Vidal et al, 2008;Rojano et al, 2016). It should be noted that the inlet temperature and relative humidity were kept constant based on experimental measurements (see Table 5) for all scenarios examined and the high relative humidity at the air inlets results from the evaporative cooling.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…For example, various studies have analyzed the indoor flow pattern (Sun et al, 2002), the influence of sub-model representing heat and mass sources from animals and litter (Rojano et al, 2014;Rojano et al, 2015), and the impact of different boundary conditions on the internal field velocity (Lee et al, 2007;Blanes-Vidal et al, 2008). There are a few papers referring to the application of CFD models in studying naturally single-sided ventilation, cross-mechanical ventilation, tunnel ventilation and mechanical single-sided ventilation for poultry houses (Allocca et al, 2003;Blanes-Vidal et al, 2008;Salvet et al, 2010;Bustamante et al, 2013;Zajicek and Kic, 2013;Bustamante et al, 2015;Rojano et al, 2016;Bustamante et al, 2017;Cheng et al, 2018). However, it is noted that CFD technique has not been widely applied to study the tunnel ventilation system used in poultry houses.…”

Section: Introductionmentioning

confidence: 99%

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Computational Fluid Dynamics aided investigation and optimization of a tunnel-ventilated poultry house in China

Yang

Dominy

et al. 2019

Computers and Electronics in Agriculture

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Ventilation system is crucial for poultry houses to control the indoor climate and air quality. The tunnel ventilation system is widely applied for large-scale poultry buildings in China but only limited scientific researches regarding the flow pattern, temperature distribution and design criteria are available in the literature. Thanks to the fast development of computer technology, Computational Fluid Dynamics (CFD) techniques were used in present study to investigate the indoor air movement, air temperature and relatively humidity. A three-dimensional CFD model was built according to the real dimensions of a laying hen house and the model was validated by comparing the simulation results with the field measurements at 30 positions. Meanwhile, statistical analysis was performed to determine the differences between different boundary conditions regarding the agreement between measured and CFD simulated results. Optimization of air inlet configurations was performed by using the validated CFD model and it was found that the uniformity of indoor air movement could prevent excessive local convective heat losses and reduce the temperature at the end of the house. Furthermore, the air inlets placed at the middle of the side wall could significantly reduce the high temperature expected at the end of the building without using extra energy, which is especially important for large-scale poultry farms with long buildings.The performance of side-wall windows was also examined and preliminary guidance was provided to effectively regulate the indoor climate by using these windows with the help of environmental monitoring systems. The present study contributes to the understanding and design of the tunnel ventilation system used in poultry houses.

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Section: Boundary Conditionsmentioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computational Fluid Dynamics aided investigation and optimization of a tunnel-ventilated poultry house in China

Yang

Dominy

et al. 2019

Computers and Electronics in Agriculture

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“…CFD model validation requires stable boundary conditions and this can shorten validation times even more. For the model developed by Rojano et al (2016), the total validation time amounted to 26 h 50 min.…”

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confidence: 99%

Validation of an AutoRegressive Integrated Moving Average model for the prediction of animal zone temperature in a weaned piglet building

Ortega

Losada

Besteiro

et al. 2018

Biosystems Engineering

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An AutoRegressive Integrated Moving Average model was validated for the prediction of temperatures in the animal zone of conventional weaned piglet barn. The validation period covered seven cycles and recorded values at 10-min intervals for 292 days. Average weight was 5.75±0.86 kg at the beginning of the production cycle and 18.41±2.12 kg at the end of the cycle. Mean outdoor air temperatures ranged 6.14 to 17.85ºC with deviations in the range 2.49ºC to 5.24ºC, which involved marked differences in the operation of the ventilation system. The Mean Average Percentage Error was below 4%, with a mean error of 1ºC. The Root Mean Square Error was in the range 0.77ºC to 1.19ºC, whereas the coefficient of determination ranged between 0.52 and 0.81. Despite the changes in environmental conditions and in animal weight and management, the accuracy of the model remained stable with low dispersion of values. Tao outdoor air temperature, ºC Taz animal zone temperature, ºC Vao volume of extracted air by the fan, m 3

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“…As for the laboratory test (wind tunnel test), under stable conditions, it can work better while requiring a lot of time and cost to repeat the different structural configurations and different weather conditions. CFD offers a feasible way to overcome the shortcomings of these two methods mentioned above; it has been widely used to study airflow and temperature distribution within livestock buildings (Nielsen et al, 2015;Rojano et al, 2016;Sejun et al, 2014;Sapounas et al, 2013;). However, due to the heavy workload of mesh generation, the accuracy and efficiency of the simulation are all greatly affected by the gird numbers and the mesh quality (Yao et al, 2016;.…”

Section: Introductionmentioning

confidence: 99%

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The paper presents an analysis of the basic principles of formation, the properties and characteristics of a new modular energy tool, consisting of the energy and the technology modules. The purpose of this study is to assess the degree of impact of the throttle in the hydraulic line, connecting the cavity of the hydraulic cylinder, upon the controllability of the modular power tool with a mounted plough during the movement of the ploughing aggregate on the headland. As a result of the conducted tests, it was proved that increasing the controllability of the movement of the aggregate on the basis of a mobile power tool is possible by throttling one of the hydraulic cylinders that limit the mutual reciprocal rotation of the modules in a horizontal plane. Installation of the throttle modular power tool on the limiting hydraulic cylinder with a drag coefficient 1.03×10 6 •N•m•s•rad-1 allows one to reduce two times the delay in the reaction of the relative bearing of the energy module to a change in the angle of rotation of its driven wheels. ABSTRAKTSDarbā analizēti jauna moduļa tipa enerģētiska un tehnoloģiska līdzekļa vērtēšanas un raksturošanas pamatprincipi. Pētījumu mērķis -droseles ietekmes pakāpes novērtēšana hidrocilindru dobumus savienojošajā hidromaģistrālē aršanas agregāta ar uzkarināmu arklu kustības laikā pagrieziena joslā. Pētījumu rezultātā pierādījies, ka agregāta kustības vadības uzlabošanās uz mobilā enerģētiskā līdzekļa bāzes iespējama pie viena hidrocilindra droselēšanas, ierobežojot moduļu savstarpējo pagriešanos horizontālā plaknē. Ierobežojoša hidrocilindra uzstādīšana moduļa tipa enerģētiskajam līdzeklim ar droseles pretestības koeficientu 1.03×10 6 •N•m•s•rad-1 ļauj divas reizes samazināt enerģētiskā moduļa virziena leņķa reakcijas nokavēšanos uz dzenošo riteņu pagriešanos.

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Computational modelling of thermal and humidity gradients for a naturally ventilated poultry house

Cited by 23 publications

References 24 publications

Computational Fluid Dynamics aided investigation and optimization of a tunnel-ventilated poultry house in China

Computational Fluid Dynamics aided investigation and optimization of a tunnel-ventilated poultry house in China

Validation of an AutoRegressive Integrated Moving Average model for the prediction of animal zone temperature in a weaned piglet building

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