Abstract
In order to evaluate the thermal and lighting energy performance of a kinetic façade using external movable shading devices, it is important to consider the operation of the shading devices since it can influence the performance significantly. This study proposes a calculation methodology which assesses the performance of the movable shading devices with the consideration of the movements of the shading devices. Calculation methods were derived by which solar heat gain, lighting energy requirement, and the primary energy equivalent to heating and cooling energy requirement can be obtained. Using the calculation methods, the optimal operation scenario for the movable shading devices was presented which can minimize the solar heat gain and lighting energy requirement. A comparison case study was carried out to demonstrate the use of the control strategies for a building where a drop awning was installed. The results showed that the optimal operation scenario suggested in this study can potentially deliver effective energy performance. The limitation and applicability of the suggested method were also discussed.
Highlights
The concept of kinetic façade is that buildings are designed to allow parts of the envelope to move in order to respond to environmental conditions
The purpose of the study described in this paper is to propose a calculation methodology which can evaluate the thermal and lighting energy performance of movable shading devices, which can be used to facilitate the development of optimal operation scenario
An annual optimal operation scenario derivation method was proposed for the external movable shading device considering the solar heat gain and lighting energy requirement affected by the operation of the shading device
Summary
The concept of kinetic façade is that buildings are designed to allow parts of the envelope to move in order to respond to environmental conditions. One of the building elements which are widely used to form a kinetic façade is the exterior movable shading devices. These devices are used on buildings and, with designated control strategies, control the solar radiation entering through the building façade, which can result in impact on energy load of a building [1,2]. Many studies have been carried out to assess the impact of movable shading devices on energy demand. By using a simulation program that can selectively apply a basic shading device to the façade of a building, relatively accurate and quantitative energy performance analysis was possible as the simulation programs use numerical analysis methods [5,6,7,8,9]. Most programs used only climate data as input parameters and not using any parameters related to the movement of the shading devices
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