Modelling, experimental test, and design of an active air permeable wall by utilizing the low-grade exhaust air

Zhang, Chong; Gang, Wenjie; Xu, Xin; Liao, Li; Wang, Jinbo

doi:10.1016/j.apenergy.2019.02.087

Cited by 20 publications

(7 citation statements)

References 39 publications

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“…The construction industry is mainly focused on different actions to promote innovative and sustainable solutions in new and existing buildings, emphasizing the building envelope [22][23][24], mainly the façades, which play a substantial role in the energy saving of the buildings [25][26][27][28][29]. Along this line, Halawa et al [30] presented a review addressing different options to optimize the performance of building façades in hot and humid climates, drawing attention to innovative solutions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

et al. 2019

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Commercial and residential building is one of the four major final energy consumption and end-use sectors. In this sector, cooling loads represent an important part of the energy consumption, and therefore, they must be minimized, improving the energy efficiency of buildings. Ventilated façades are one of the most widely used passive elements that are integrated into buildings, precisely with the aim of reducing these loads. This reduction is due to the airflow induced in the air cavity by the buoyancy forces, when the solar radiation heats the outer layer of the façade. In the open joint ventilated facades (OJVF), ventilation is attained through the open joints between the panels composing the outer layer. Despite the steadily growing research in the characterization of this type of system, few studies combine the numerical modelling of OJVF with experimental results for the assessment of the airflow in the ventilated cavities. This paper experimentally validates a numerical simulation model of an OJVF. Firstly, the façade performance has been experimentally assessed in a laboratory model determining the temperatures in the panels and air gap and measuring the flow field at the gap using particle image velocimetry (PIV) techniques. Secondly, a numerical model has been developed using advanced Computational Fluid Dynamics (CFD) simulation tools. Finally, an experimental validation of the numerical model has been done. Experimental and numerical results are compared in different planes inside the ventilated cavity. The discrete ordinates (DO) radiation model and the k-ε renormalisation group (RNG) turbulence model better adjust the simulated results to the experimental ones.

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Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

et al. 2019

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“…Consequently, the interior surface temperature of the EAIW is very close to the indoor air temperature, resulting in enhanced indoor thermal comfort and a decrease in cooling load [88]. When utilizing an exfiltration airflow rate of 0.003 m/s and a 30 mm thickness of porous materials, the U-value of the EAIW can be reduced to 0.1 W/(m 2 •K) [89]. Moreover, the pressure loss of exfiltration airflow and infiltration airflow within EAIW (exfiltration mode of APBE) [48] and DI (infiltration mode of APBE) [90] were estimated based on Darcy's law, and the energy requirements for driving a constant airflow in EAIW and DI were investigated, respectively.…”

Section: A Bibliometric Analysis Of Air-permeable Building Envelopesmentioning

confidence: 99%

Air-Permeable Building Envelopes for Building Ventilation and Heat Recovery: Research Progress and Future Perspectives

Zhang,

Yu,

Zhu

et al. 2023

Buildings

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Air-permeable building envelopes (APBEs) utilize the infiltrated or exfiltrated airflow within porous materials to directly change their temperature distribution to reduce heat loss/gain. APBEs effectively integrate building ventilation and heat recovery to achieve excellent thermal insulation while improving indoor air quality. This paper presents a comprehensive review of the fundamentals and classifications, historical evolution over time, opportunities and benefits, and future views on APBEs. It can be treated as a responsive building envelope that enables building envelopes to dynamically change the U-values by varying the infiltrated or exfiltrated airflow rate within a porous material. Previous studies have indicated that the U-value of 0.1 W/(m2·K) can be realized by employing APBEs. Moreover, some research demonstrates that APBEs could act as high-performance air filters that reduce over 90% of particulate matter within fresh, ventilated air. Some factors, such as airflow rate, thickness, and thermal conductivity of porous materials, have a significant influence on the effectiveness of APBEs. For practical applications, integrating the APBE with passive building ventilation can help reduce the initial cost and facilitate decarbonization in buildings. Moreover, advanced control strategies could collaboratively optimize the operation of ABPEs and build energy systems to maximize their energy-saving potential.

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“…Moreover, the low-grade outlet air of the EAHE system, driven by a solar chimney, can be used to cool down the photovoltaic modules for improving its efficiency of power generation [50]. Furthermore, the airflow window and ventilated wall [51][52][53] show excellent thermal performance by utilizing low-grade exhaust air to prevent the heat transfer through the window and wall. Integrating the EAHE system with these thermally activated building envelopes will further eliminate the influence of outdoor thermal disturbance on the indoor built environment.…”

Section: Opportunities Of the Eahe System For Net-zero Energy Buildingsmentioning

confidence: 99%

Utilization of Earth-to-Air Heat Exchanger to Pre-Cool/Heat Ventilation Air and Its Annual Energy Performance Evaluation: A Case Study

et al. 2020

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An earth-to-air heat exchanger (EAHE) system utilizes the low-grade thermal energy of underground soil to warm up and cool down the flowing air within an underground buried pipe. Integrating the EAHE system with building ventilation can reduce the energy demand for conditioning ventilation air. The main purposes of this paper are to estimate the year-round energy-saving potential of the EAHE-assisted building ventilation system and provide its design guidelines in a hot-summer and cold-winter climate. A steady-state heat transfer model was proposed to calculate the outlet air temperature of an EAHE and further identify its ability to preheat and precool ventilation air. Influences of depth, length, and diameter of a buried pipe on the year-round thermal performance of the EAHE system were evaluated. The results show that considering the compromise between thermal performance and construction costs of the EAHE system, a depth of 5 m and a length of 80 m are recommended. The EAHE system can provide a mean daily cooling and heating capacity of 19.6 kWh and 19.3 kWh, respectively. Moreover, the utilization of the EAHE system can reduce by 16.0% and 50.1% the energy demand for cooling and heating ventilation air throughout the whole year.

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Modelling, experimental test, and design of an active air permeable wall by utilizing the low-grade exhaust air

Cited by 20 publications

References 39 publications

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

Air-Permeable Building Envelopes for Building Ventilation and Heat Recovery: Research Progress and Future Perspectives

Utilization of Earth-to-Air Heat Exchanger to Pre-Cool/Heat Ventilation Air and Its Annual Energy Performance Evaluation: A Case Study

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