Abstract
In this study a system constituted by seven double skin facades (DSF), three equipped with venetian blinds and four not equipped with venetian blinds, applied in a virtual chamber, is developed. The project will be carried out in winter conditions, using a numerical model, in transient conditions, and based on energy and mass balance linear integral equations. The energy balance linear integral equations are used to calculate the air temperature inside the DSF and the virtual chamber, the temperature on the venetian blind, the temperature on the inner and outer glass, and the temperature distribution in the surrounding structure of the DSF and virtual chamber. These equations consider the convection, conduction, and radiation phenomena. The heat transfer by convection is calculated by natural, forced, and mixed convection, with dimensionless coefficients. In the radiative exchanges, the incident solar radiation, the absorbed solar radiation, and the transmitted solar radiation are considered. The mass balance linear integral equations are used to calculate the water mass concentration and the contaminants mass concentration. These equations consider the convection and the diffusion phenomena. In this numerical work seven cases studies and three occupation levels are simulated. In each case the influence of the ventilation airflow and the occupation level is analyzed. The total number of thermal and indoor air quality uncomfortable hours are used to evaluate the DSF performance. In accordance with the obtained results, in general, the indoor air quality is acceptable; however, when the number of occupants in the virtual chamber increases, the Predicted Mean Vote index value increases. When the airflow rate increases the total of Uncomfortable Hours decreases and, after a certain value of the airflow rate, it increases. The airflow rate associated with the minimum value of total Uncomfortable Hours increases when the number of occupants increases. The energy production decreases when the airflow increases and the production of energy is higher in DSF with venetian blinds system than in DSF without venetian blinds system.
Highlights
A double skin facade (DSF) is usually made up of a transparent glass envelope that overlaps the building’s common envelope, leaving an air cavity between these two facades (“skins”)
The aim of this study is to develop a DSF system, based on seven DSF, three equipped with venetian blinds and four not equipped with venetian blinds, applied in an occupied virtual chamber
In this study the development of a DSF system applied in a virtual chamber is made
Summary
A double skin facade (DSF) is usually made up of a transparent glass envelope that overlaps the building’s common envelope, leaving an air cavity between these two facades (“skins”). In this air cavity, shading devices (usually of venetian-type blind) or systems that produce electrical energy such as photovoltaic cells can be installed. In the well-detailed work of Ghaffarianhoseini et al on the benefits and economic feasibility of the DSF use [1], the impact on thermal behavior, energy efficiency, and daylighting performance of the buildings of several DSF technical characteristics were analyzed. Ghaffarianhoseini et al [1]
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