Lighting energy consumption of 15th floor is higher than 14th floor.
I am modeling a 15-story residential building. Each story has 4 apartment units. I have two problems.
Problem : Lighting energy consumption of 15th floor is higher than 14th floor.
Case A (See images): I modeled 4 thermal zones (each include 15 vertical apartment units). The result of lighting energy consumption of different floors: 1-Floor: 9895, 2-Floor: 9890, 7-Floor: 9560, 14-Floor: 9502, and 15-floor: 10068 kWh. There is big jump between 14th and 15th floor. Lighting energy consumption must decrease, not increase. After adding a 16th floor, I re-simulated the 15th floor, then the result dropped 9392 kWh. How it is possible that the lighting energy consumption of 15th floor is higher than 14th floor? How can I fix this problem?
Case B In order to solve this problem, I considered each apartment unit as a single zone and I created 60 zones in total. And re-simulated. Average ligthing floor consumption is 11819, Which is higher than all above. How it is possible?
Can you upload the images now that you have a bit more karma please?
Are there any zone or zone group multipliers?
Hi David, I am using OpenStudio-1.11.0.4313b0e0d9-Win64. Radiance Parameters : Coarse, the default one. I modeled in Sketchup 2016. Lighting Control Type: Continuous. I copied and paste the first floor for 15 times vertically. So, the lighting inputs and geometry/floor area are the same on each floor.
Hi Julien, how do I upload pictures, the attachment or upload option is gone. Hi Arhmage, No, there are not any zone or zone group multipliers.
Thank you,
Hum you might need 20 of karma, I'm not sure
Is there a way to send pictures via email?
Thought of a few more questions.
You should probably request time series output of lighting and compare the same zone on 15th floor to lower floor. See when specifically things are different.
Building footprint is a 20x20 meter square (each apartment unit is 10x10x3 meter). The geometry is a rectangular prism, so each repeats vertically. There is not any blind on windows. I have been working on this problem for 2 weeks. I remodeled my building several times, the result did not changed.
It is not specific to my project. Another example: 10 X10 X3m apartment unit. 5 story building midrise apartment. No neighbor buildings. Climate: Istanbul. All construction default. 1 thermal zone and 5 daylight controls. Lighting simulation results; 4th floor: 2389 kwh & 5th floor 2472.47 kwh. Energy consumtion of 5th floor is considerable higher than 4th floor, which is impossible :(