Fan-independent air balancing method based on computation model of air duct system

Chen, Haoran; Cai, Wenjian; Chen, Can

doi:10.1016/j.buildenv.2016.06.008

Cited by 27 publications

(10 citation statements)

References 14 publications

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“…Para determinar la efectividad de la reducción de la resistencia de protuberancias, se llevó a cabo la simulación numérica y el experimento a gran escala centrándose en el grado adecuado de protrusión que puede lograr la resistencia más baja. Para la simulación numérica CFD se utilizaron varias alturas de protrusión adimensionales, una metodología de estudio conocida y económica [31][32][33] . Para asegurar la exactitud de los resultados numéricos, la selección del modelo de turbulencia, la configuración de capa límite, la generación de malla y la independencia de la simulación se verificaron antes realizar la CFD 34,35 .…”

Section: Métodos De Investigaciónunclassified

Conducto en T biomimético para reducir la resistencia local de un sistema de ventilación y aire acondicionado

Gao,

Liu,

et al. 2019

Re-Descubriendo El Mundo Natural: La Biomimesis en Perspectiva

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Tongtai Fire and Security Co., (Shanghái) E l ahorro de energía en los edificios es una de las medidas importantes que se utilizan para reducir la escasez de energía y fomentar el desarrollo sostenible 1-3 . El consumo de energía de los sistemas de conductos de ventilación y aire acondicionado (como, por ejemplo, los tipos de sistemas de transporte y distribución de aire) ha recibido considerable atención. El consumo de energía del ventilador causado por la resistencia de los sistemas de ventilación y aire acondicionado representa aproximadamente del 20% al 40% del consumo de energía de los edificios públicos; para algunos edificios, los niveles son incluso superiores a los de los sistemas de refrigeración acondicionados 4,5 . Por lo tanto, determinar cómo optimizar el rendimiento de los sistemas de conductos de ventilación y aire acondicionado, reduciendo así la resistencia y disminuyendo el consumo de energía del ventilador, se ha convertido en un tema clave.Al buscar equipo eficiente de energía para edificios, los investigadores han considerado la morfología y comportamiento de animales y plantas como inspiración. Por ejemplo, Chen (2017) estudió el método de búsqueda de fuentes de contaminación mediante robots a través de la simulación de los comportamientos del olfato y búsqueda por parte de diversos animales 6 . Liu Z (2017) introdujo un modelo de estimación rápida para la concentración de contaminantes basado en el aprendizaje automático [7][8] . Zeiny (2012) aplicó principios biomiméticos a los diseños de construcción tipo concha y usó la luz del sol para reducir el consumo de energía de la iluminación interior 9 . Reddi (2012) abordó el rendimiento autoajustable de la temperatura y la estabilidad estructural del suelo basándose en la piel animal 10 . Zhao (2010) estudió la estructura de un nido de termitas y su capacidad para mantener una temperatura ambiente constante y aplicó los hallazgos al Zimbabwe Eastgate Center 11 . Zalewski (2002) analizó la aplicación y optimización de termosifones en las chimeneas solares 12, 13 . Kirchner (2002) propuso un modelo de evacuación con base en el comportamiento de los rebaños y analizó los factores que influyen en el tiempo de evacuación 14 . A partir del principio de reparación

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Section: Métodos De Investigaciónunclassified

Conducto en T biomimético para reducir la resistencia local de un sistema de ventilación y aire acondicionado

Gao,

Liu,

et al. 2019

Re-Descubriendo El Mundo Natural: La Biomimesis en Perspectiva

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“…Since multiple zones could have different requirements due to differences in the number of occupants, equipment, devices and activities, the ventilation in different terminals may be unevenly distributed producing discomfort. Also, energy could be wasted in over ventilated spaces due to poor equipment control, variability, supply and exhaust fans typically work on an equal basis and work more than required [14].…”

Section: Introductionmentioning

confidence: 99%

Control Strategies in Multi-Zone Air Conditioning Systems

Rismanchi

Zambrano

Saxby³

et al. 2019

Energies

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In a commercial building, a significant amount of energy is used by the ventilation systems to condition the air for the ‎indoor environments to satisfy the required quantity (temperature ‎and humidity) and quality (amount of fresh air). For many years, Variable Air Volume ‎‎(VAV) systems have been considered as the most efficient solutions by balancing the airflow volume based on the demand making them energy efficient when compared with the traditional Constant Air Volume (CAV) systems. However, the setpoints in VAV systems are ‎often misread by the sensors due to stratification and formation of pollutant pockets and ‎responding to design levels that overestimate the real-time demand conditions, which result in ‎waste of energy, thermal discomfort and unhealthy air. In general, VAV devices are expensive, complicated and prone to failures and ‎they are used only in medium and large projects. More recently, new technologies have evolved to solve this issue. In one of the new solutions, VAV motors terminals are replaced with flaps which are simpler and less expensive thus, they can be implemented ‎in a wider range of projects. In systems, balancing and supplying the optimal airflow ‎to reduce the energy consumption while delivering ideal thermal and Indoor Air Quality (IAQ) levels are the ‎main challenges. In this paper, a comparison of the recent technologies with traditional VAV systems is presented to be used as a guild line for researchers and designers in the field of Heating Ventilation Air Conditioning (HVAC)‎.

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“…The outcomes largely depend on engineers' experience. To overcome this problem, simplified way by using the ratio of the junction pressure (SPJ') to the hood static pressure (SPH') for each branch was proposed to avoid repeated velocity determinations that required before [16].Some new methods based on both theoretical calculation model and measuring feedback data have been also studied and made some improvements [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A novel flow-guide device for uniform exhaust in a central air exhaust ventilation system

Tong

Gao

Luo

et al. 2019

Building and Environment

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Exhaust ventilation system with one central fan and multiple terminals has been widely used for the heat and contaminant removal in building environment. Conventional design without pressure balancing leads to uneven distribution of exhaust airflow rate among the multiple outlets. Existed balancing methods usually uses dampers (constant-air-volume valve or regulating valve), tapered duct, or varied inlet area. However, these methods result in higher fan energy consumption, or complicated construction and on-site commissioning. In this paper, a flow-guide device was developed for adjusting the pressure distribution of duct branches. This new device is integrated with the interflow Tee-junction and does not need any commissioning or regulating. The resistance performance of the device responding to the structural parameter was derived using the CFD simulation and experiment. The negative direct resistance featured by the device was found to effectively benefit exhaust at the outlets farther away from the central fan. The ductwork hydraulic model based on the Bernoulli's law of airflow and the fitted resistance correlations were further proposed to fulfill the parametric design. Finally, full-scale test was carried out for a central exhaust system installed with the flow-guide devices referring to a factory workshop with 30 heat and contaminant sources. Compared to the system without the devices, the total rate of the system increased by 25%. Discrepancy of exhaust rate decreased by 78% and uneven degree decreased by 82%, which well meets the engineering balancing requirement. Meanwhile, total resistance of the system reduced 23.8% owing to the negative loss the devices bring.

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Fan-independent air balancing method based on computation model of air duct system

Cited by 27 publications

References 14 publications

Conducto en T biomimético para reducir la resistencia local de un sistema de ventilación y aire acondicionado

Conducto en T biomimético para reducir la resistencia local de un sistema de ventilación y aire acondicionado

Control Strategies in Multi-Zone Air Conditioning Systems

A novel flow-guide device for uniform exhaust in a central air exhaust ventilation system

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