| Title |
Development of a Control Algorithm for Exterior Movable Shading Device considering Shaded Fraction |
| Authors |
Choi, Su-Ji ; Jo, Jae-Hun |
| DOI |
http://dx.doi.org/10.5659/JAIK_PD.2016.32.10.53 |
| Keywords |
Exterior Shading Devices ; Movable Shading Devices ; Shading Control ; Shaded Fraction ; Algorithm |
| Abstract |
An external movable shading device is installed on an envelope to control light and thermal environments. This device is typically used to improve a visual comfort by blocking direct solar radiation, rather than limitedly applied to control a thermal environment. This paper proposes a shaded fraction control algorithm, which can be applied to external movable shading devices, to satisfy visual comfort and reduce heating and cooling load at the same time. The shaded fraction and profile angle are set for controlling parameter. The optimized shaded fraction is derived by considering glare, illuminance, heating load and cooling load through decision process of a control algorithm. Finally, allowable range of movements is determined by applying the optimized shaded fraction. Energy simulation is performed by applying shading control method such as energy reduction, glare protection, visual comfort. The simulation result confirms that the three control methods are satisfied to prevent glare and effective in energy savings than control methods proposed in previous studies. |