Part II: Thermal analysis of naturally ventilated BIPV system: Modeling and Simulation

Agathokleous, Rafaela A.; Kalogirou, Soteris A.

doi:10.1016/j.solener.2018.02.057

Cited by 37 publications

(15 citation statements)

References 15 publications

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“…Some studies assess the influence of design [44,45] and climate conditions [46][47][48][49] on energy savings, giving key strategies for the system efficiency. Currently, photovoltaic systems are integrated in ventilated façades, and experimental [50], numerical [51] and combined studies [52,53] have been carried out for these kinds of solutions. Other studies evaluate the impact of phase change materials [54], or air control temperature [55] on the ventilated façade performance.…”

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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“…To check validity of the model, air temperatures predicted inside the façade when closed and acting as further insulation are compared to the measurements available under this operating mode. Figure 6 illustrates the difference between the predicted value through the model and the average measured one for a sample period (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). It can be seen that the model misestimates the temperature inside the façade during the periods of high irradiance.…”

Section: Predicted Temperatures Inside the Façadementioning

confidence: 99%

“…Lately, building-integrated photovoltaic (BIPV) systems are becoming more and more common in modern public buildings, where PV (photovoltaic) panels replace conventional construction materials of the building's envelope [7]. Since the moment when the first BIPV system had been installed in Germany [8], many researchers have focused their work on different types of PV façades.…”

Section: Introductionmentioning

confidence: 99%

“…The PV double-skin prototype resulted in a slight increase in cooling needs for all the French climates considered, whereas the impact of the façade on heating needs turned out to be not predominant from the energetic point of view. Regarding the factor of the air gap within the façade, Agathokleousa and Kalogiro [7] found that in Cyprus conditions, an air gap of 0.1 m could create adequate air flow on naturally ventilated systems and was able to ensure low PV temperatures to avoid efficiency decrease. In addition, Gan [14] investigated the air gap in BIPV systems required to reduce PV overheating.…”

Section: Introductionmentioning

confidence: 99%

“…and CFD models. Agathokleousa and Kalogiro [7] used a simulation model created in COMSOL Multiphysics. Dama et al [19] applied a BS model based on a pressure loop and heat transfer along the inside space of the DSF, whilst Frilling at al.…”

Section: Introductionmentioning

confidence: 99%

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Improved Performance of a PV Integrated Ventilated Façade at an Existing nZEB

et al. 2019

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Ventilated façades are among the existing measures to reduce the energy demand in buildings. The combination of this passive heating and cooling strategy with photovoltaics (PV) can drive new buildings towards the current European targets near or even to net zero energy Buildings (nZEB). The present work studies the thermal behavior of the PV integrated ventilated façade applied in the nZEB known as “LUCIA” (acronym in Spanish for “University Centre to Launch Applied Research”) at the University of Valladolid, Spain. The aim is to evaluate the interest of recirculating indoor air within the façade during winter, as an alternative to the present preferred operating mode during the target season, in which the façade acts as further insulation. First, the radiant properties of the PV façade are measured to use the values in a mathematical model that describes the behavior of the ventilated façade in its current operating mode in winter. Then, the solar radiation available, the air-dry bulb temperatures indoors, outdoors and inside the ventilated façade are monitored to obtain experimental data to validate the model. The results show that air recirculation can entail favorable heat gains during 10% of winter, being this alternative preferable to the present operating mode when outdoor temperatures are over 18.4 °C.

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A Review of the Significance and Challenges of Building Integrated Photovoltaics

Attoye

Aoul

2020

Energy Efficient Building Design

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Part II: Thermal analysis of naturally ventilated BIPV system: Modeling and Simulation

Cited by 37 publications

References 15 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

Improved Performance of a PV Integrated Ventilated Façade at an Existing nZEB

A Review of the Significance and Challenges of Building Integrated Photovoltaics

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