Lighting level control of the office room. Technical implementation and daylight modelling of the system

Size: px

Start display at page:

Download "Lighting level control of the office room. Technical implementation and daylight modelling of the system"

Dayna Berry
5 years ago
Views:

1 Lighting level control of the office room. Technical implementation and daylight modelling of the system Jorma Lehtovaara & Jouko Pakanen TKK Lighting Laboratory IEA ECBCS Annex 45, 6th Expert Meeting, October, Lyon

2 Objective To create a new approach for lighting level control of office rooms, which: Guides the user to apply energy efficient but still satisfactory artificial lighting level Creates uniform spatial lighting level distribution in the office room by benefitting natural outdoor lighting Extends lamp lifes of the controlled system Avoids excessive instrumentation and measurements in its final implementation Benefits new IC-technology in control

3 The approach Spatial lighting requirements of the office room are simulated by a computer program All the information concerning structures, surfaces, furniture, working places, environmental variables etc. are included The simulation will be done many times by varying indoor and outdoor environmental conditions and including seasonal variations The output data is applied in lighting level and blind position control together with indoor and outdoor environmental measurements Possibility for human feedback included

4 Overview of the system

5 Daylight simulation Sun position, weather, intensity Geometry, orientation,materials + = Blind model Sun altitude Julian day Room model Daylight calculations Max altitude 9: 11: 13: 15: 17: - Precalculated scenes - Real-time control

6 TKK Light House Daylight laboratory Light Cube PV-panels on south facade DALI-lighting system Daylight measurement

7 DALI-control system Motorized venetian blinds DALI-bus Blind control unit Luminaires with Dali-ballasts Digidim Toolbox software

8 Data Logging Sensors Outdoor illuminance: - Global horizontal and vertical south Indoor illuminances: - 3 horizontal sensors at workplane (1m, 2m and 3m from window) - 1 vertical sensor at eye height Average window luminance PV-panel output Recording interval 5 min Measurement series in all seasons

9 Daylight measurements 1 9 Indoor illuminances with blind angle +45 degrees July Indoor illuminances with blind angle + degree (overcast day, July 27) Eh indoor (lx) E3 E2 E1 Eh indoor (lx) E3 E2 E Ev outdoor (lx) Ev outdoor (lx) Indoor illuminances with blind angle +3 degrees July Effect of blind angle on indoor illuminances Examples: +, +3 and +45 degrees Eh indoor (lx) E3 E2 E Ev outdoor (lx)

10 Daylight measurement Daylight Factor DF vs. blind tilt angle, overcast day 2,5 % DF 2, % 1,5 % 1, %,5 % DF3 DF2 DF1 Distance from window: DF1 = 1 m DF2 = 2 m DF3 = 3 m, % blind angle DF = Eh in / Eh out

11 Window luminance vs. vertical outdoor illuminance Average window luminance Lw at blind angle degrees June-July 27 Lw (cd/m2) Lw Average window luminance at blind angle 3 degrees Vertical outdoor illuminance Ev (lx) Lw (cd/m2) Average window luminance Lw at blind angle 6 degrees Lw Lw (cd/m2) Vertical outdoor illuminance Ev (lx) Lw Vertical outdoor illuminance Ev (lx) = 5 cd/m 2 (glare limit)

12 Technical implementation A demonstration system will be installed in the office rooms of TKK Lighting laboratory The system will be interfaced to the daylight measurement and photovoltaic system of the building The lamps and venetian blinds are controlled through Dali-bus using Digidim-Toolbox user interface The ultimate goal is to save the model in an serial flash memory-ic and create control system for each room with minimum measurements and instrumentation.

A Study on Performance Evaluation of Mixed Light Shelf Type According to the Angle of Light Shelf

Vol. 9, No. 1 (15), pp. - http://dx.doi.org/1.157/ijsh.15.9.1. A Study on Performance Evaluation of Mixed Light Shelf Type According to the Angle of Light Shelf Woori Chae 1.1, Heangwoo Lee.1 and Yongseong