The effect of different weather data sets and their resolution in climatebased daylight modeling for the location of Copenhagen
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1 The effect of different weather data sets and their resolution in climatebased daylight modeling for the location of Copenhagen Anne Iversen, Technical University of Denmark
2 Why?? The climate-based daylight modeling approach is based on available weather data, which means that the climate/weather data used as input to the daylight simulations are of huge importance Investigate the effect of simulating with different weather data sets Investigate the effect of simulating with weather data sets of an hourly resolution compared to a 1 min resolution 2 DTU Civil Engineering, Technical University of Denmark
3 Radiance Three Phase Method, changing the timesteps i=vtds 3 DTU Civil Engineering, Technical University of Denmark
4 Evaluation method Lighting Dependency (reverse of DA) - the percentage of occupied hours per year when artificial light has to be added to the lighting scene to maintain a workplane threshold illuminance level Continous Lighting Dependency (~DAcon) describing the artificial light contribution in an ideal photoelectric dimming system when the daylight threshold is not maintained during working hours 4 DTU Civil Engineering, Technical University of Denmark
5 Evaluation method 5 DTU Civil Engineering, Technical University of Denmark
6 Evaluation method - Weather data Meteonorm (MET) Energy Plus, International Weather for Energy Calculations (IWEC) Design Reference Year (DRY) 6 DTU Civil Engineering, Technical University of Denmark
7 Simulations of hourly means 7 DTU Civil Engineering, Technical University of Denmark
8 Simulations of hourly means 8 DTU Civil Engineering, Technical University of Denmark
9 Simulations of hourly means relative difference (LDdry-LDx)/LDdry for the daylight simulations of hourly means 9 DTU Civil Engineering, Technical University of Denmark
10 Simulations of hourly means relative difference (LDdry-LDx)/LDdry for the daylight simulations of hourly means 10 DTU Civil Engineering, Technical University of Denmark
11 Simulations of hourly means relative difference (LDdry-LDx)/LDdry for the daylight simulations of hourly means 11 DTU Civil Engineering, Technical University of Denmark
12 Simulations of hourly means Normalized Power Density (NPD) 1.9W/(m 2 100lux) 12 DTU Civil Engineering, Technical University of Denmark
13 Light Dependency and Continuous Light Dependency Hourly resolution 13 DTU Civil Engineering, Technical University of Denmark
14 Light Dependency and Continuous Light Dependency Hourly resolution 14 DTU Civil Engineering, Technical University of Denmark
15 Generation of 1 min irradiance datasets Stochastic Skartveit-Olseth model implemented in Daysim (Walkenhorst et al., 2002) Non-deterministic influence of the stochastic model on the simulation outcome = negligible 15 DTU Civil Engineering, Technical University of Denmark
16 Hourly means vs 1-min resolution Relative difference in lighting dependency for 1h means and 1-min (1h-1min)/1h 16 DTU Civil Engineering, Technical University of Denmark
17 Dynamic control Four different control strategies investigated 1) Photoelectric switch on/off for each time step, as illustrated by LD, 2) Photoelectric dimming, as illustrated by LD con (Proportional response), 3) Photoelectric dimming for every 10 min, LD con-10min and 4) Proportional integral dimming, where the response is averaged over the past 10 min (LD PI ). It is assumed that the relationship between the light output and sensor signal is linear. 17 DTU Civil Engineering, Technical University of Denmark
18 Hourly means vs 1-min resolution 18 DTU Civil Engineering, Technical University of Denmark
19 Hourly means vs 1-min resolution 19 DTU Civil Engineering, Technical University of Denmark
20 Hourly means vs 1-min resolution Relative difference in for 1h means and 1-min (1h-1min)/1h 20 DTU Civil Engineering, Technical University of Denmark
21 Dynamic control 21 DTU Civil Engineering, Technical University of Denmark
22 Dynamic control 22 DTU Civil Engineering, Technical University of Denmark
23 Dynamic control 23 DTU Civil Engineering, Technical University of Denmark
24 Conclusion In contrast to the study by Walkenhorst et al. (2002) it is not possible to conclude that the daylight availability is overestimated by applying data of hourly means compared to data of 1 min resolution. The findings from these comparisons show that the hourly resolution does overestimate and underestimate the daylight availability. For simulations of control of artificial lights values of hourly means are a reasonable predictor for the daylight availability for a location as Copenhagen. 24 DTU Civil Engineering, Technical University of Denmark
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