Flow Pattern Effects on Night Cooling Ventilation

Lissén, José Manuel Salmerón; Fernández, Juan Antonio Sanz; Flor, Francisco José Sánchez de la; Domínguez, Servando Álvarez; Ruiz–Pardo, Álvaro

doi:10.1080/14733315.2007.11683761

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…In parallel, when applied to buildings with air conditioning, a considerable reduction in the cooling demand can be expected [63]. However, most studies refer to commercial buildings, very few of them refer to the application of night ventilation in residential buildings [64][65][66] and almost none to historic buildings. In this way, the use of night ventilation techniques is proposed in this work as a possible alternative to reduce the demand for cooling in heritage buildings, since apart from achieving such a reduction they do not affect the appearance of their architecture.…”

Section: Extension Of the Catalog-cooling Needsmentioning

confidence: 99%

Design of the Refurbishment of Historic Buildings with a Cost-Optimal Methodology: A Case Study

et al. 2019

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The transformation of existing buildings into Near Zero Energy Buildings or even positive energy buildings remains a major challenge. In particular, historic buildings are an important cultural heritage that, in most cases, may be rehabilitated and reused for new purposes. However, achieving higher efficiencies in those buildings presents many difficulties, since there is a need to preserve aesthetic values and minimize impact on the buildings’ initial construction. In this work, a roadmap that allows rehabilitating a building from the eighteenth century is developed, turning it into a landmark building, to be used as a museum in the near future. The procedure is based on 3D models using REVIT software and detailed energy simulations supported by a cost-optimal methodology. The results reveal how conventional methodologies shown in the literature may improve the energy performance of the buildings during the heating regime, but performance may deteriorate during the cooling season. For that reason, the present study includes the design of a night ventilation system which allows not only solving this problem but also to reducing the cooling demands by more than 43% with little additional costs. In conclusion, historic buildings (which traditionally have a high thermal mass) have increased thermal storage potential by using the structures of the buildings themselves as well as passive cooling techniques.

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Section: Extension Of the Catalog-cooling Needsmentioning

confidence: 99%

Design of the Refurbishment of Historic Buildings with a Cost-Optimal Methodology: A Case Study

et al. 2019

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“…J.M. Salmeron [17] studied the efficiency of cross ventilation at night as a function of the air flow rate, flow pattern and distribution of thermal mass and considered the positions of the inlet and outlet openings as well as their influence on the heat-transfer coefficients of the walls through the use of CFD techniques; however, the sensitivity was not analysed for all of the geometric variables of the problem in this study.…”

Section: Introductionmentioning

confidence: 99%

A New Forced Convection Heat Transfer Correlation for 2D Enclosures

Rincón-Casado¹,

Flor²

2022

Applications of Computational Fluid Dynamics Simulation and Modeling

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This work presents a new parametric correlation for 2D enclosures with forced convection obtained from CFD simulation. The convective heat transfer coefficient of walls for enclosures depends on the geometry of the enclosure and the inlet and outlet openings, the velocity and the air to wall temperature difference. However, current correlations not dependent on the above parameters, especially the position of the inlet and outlet, or the temperature difference between the walls. In this work a new correlation of the average Nusselt number for each wall of the enclosure has been developed as a function of geometrical, hydrodynamic and thermal variables. These correlations have been obtained running a set of CFD simulations of a 3 m high sample enclosure with an inlet and outlet located at opposite walls. The varying parameters were: a) the aspect-ratio of the enclosure (L/H = 0.5 to 2), b) the size of the inlet and outlet (0.05 m to 2 m), c) the inlet and outlet relative height (0 m to 3 m high), and d) the Reynolds number (Rein = 103 to 105). Furthermore, a parametric analysis has been performed changing the temperature boundary conditions at the internal wall and founds a novel correlation function that relates different temperatures at each wall. A specifically developed numerical model based on the SIMPLER algorithm is used for the solution of the Navier–Stokes equations. The realisable turbulence k-ε model, and an enhanced wall-function treatment have been used. The heat transfer rate results obtained are expressed through dimensionless correlation-equations. All developed correlations have been compared with CFD simulations test cases obtaining a R2 = 0.98. This new correlation function could be used in building energy models to enhance accuracy of HVAC demands calculation and estimate the thermal load.

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