Indoor environment control system using smart window
An indoor environment control system using smart windows includes at least two smart windows of which colors change in accordance with the intensity of supplied voltages, an internal illuminance sensor disposed inside each of the smart windows and configured to measure internal illuminance, an external illuminance sensor disposed outside each of the smart windows and configured to measure external illuminance, a main controller configured to calculate transmittance of each of the smart windows using internal illuminance and external illuminance provided from the internal illuminance sensor and the external illuminance sensor, and to calculate the intensity of a voltage that is supplied to each of the smart windows such that a difference of the calculated transmittances is a setting value (N) or less, and unit controllers configured to supply the voltages having the intensity supplied from the main controller to the smart windows, respectively.
1 . An indoor environment control system using smart windows, the indoor environment control system comprising:
at least two adjacent smart windows of which colors change in accordance with intensities of supplied voltages;
at least two internal illuminance sensors, each internal illuminance sensor disposed inside a respective smart window and configured to measure an internal illuminance corresponding to the respective smart window;
at least two external illuminance sensors, each external illuminance sensor disposed outside a respective smart window and configured to measure an external illuminance corresponding to the respective smart window;
a main controller configured to:
calculate transmittances of each of the adjacent smart windows based on internal illuminances and external illuminances provided from the internal illuminance sensors and the external illuminance sensors, and
calculate a difference of between the calculated transmittances of the at least two adjacent smart windows, and
calculate intensities of voltages to be supplied to each of the at least two adjacent smart windows such that a difference between the calculated transmittances of the at least two adjacent smart windows is a setting value (N) or less than the setting value (N); and
unit controllers configured to supply the calculated voltages having the intensities supplied from the main controller to each of the at least two adjacent smart windows, respectively.
2 . The indoor environment control system of claim 1 , wherein the main controller calculates a standard difference of the calculated transmittances of the at least two adjacent smart windows, and when the calculated standard difference exceeds the setting value (N), the main controller adjusts the intensity of a voltage, which is supplied to a smart window in which the standard difference exceeds the setting value (N), by Vm that is an adjustment voltage, wherein Vm is x or more and y or less, the x is smaller than 0, and y is larger than 0.
3 . The indoor environment control system of claim 2 , comprising a setting & monitoring unit configured to monitor the intensity of the voltages that are supplied to the at least two adjacent smart windows, provide information about the intensity of the voltages that are supplied to the at least two adjacent smart windows from the main controller to a building energy management system (BEMS) at the outside, and having initial voltages set to be supplied to the at least two adjacent smart windows in accordance with a setting mode.
4 . The indoor environment control system of claim 1 , wherein the main controller controls the unit controllers to supply voltages to the at least two adjacent smart windows in any one of a manual mode, a schedule mode, and an auto mode, and
the manual mode is a mode that is operated in accordance with a level selected by level 1 to level 4 having different intensity input by a user, the schedule mode is a mode in which when a level is set for each of specific times, the levels are performed at the times, and the auto mode is a mode that is operated using internal illuminance, external illuminance, and an algorithm when the manual mode or the schedule mode is not selected.
5 . The indoor environment control system of claim 4 , wherein the auto mode adjusts the intensity of the voltages that are supplied to the at least two adjacent smart windows when target indoor illuminance and internal illuminance sensed by the internal illuminance sensor are different, wherein Vm that is an adjusted voltage is x or more and y or less, x is smaller than 0, and y is larger than 0.