How can I set up light gains in BTM?
Posted: Thu Dec 10, 2015 6:48 pm
Hello,
So I am trying to analyze lighting electricity load in my model. First, I simulated my rooms in DIALux to obtain the Wattage and W/m2/100 lux for my light fittings, then I used those values in my internal gains profile for each room in order to calculate the lighting electrical load in IES and then run daylight analysis to assess energy saving (in Radiance). However, the results of the dynamic simulations are over the line. and are clearly in the megawatt region!! Here is a room input sample:
(BTM room weekly profile details)
Usage hours/week: 25.5 hours
number of weeks: 9.1 weeks
Internal gains profile details:
Type: Fluorescent lighting
Maximum sensible gain (W): 608.00 W
Maximum power consumption (W): 608.00 W
Radiant fraction: 0.45
Fuel: Electricity
Variation profile: Set to the weekly profile
Dimming profile: on continuously
My weekly profile is divided into days and there is noting wrong with it. all parameters under the "Room conditions" are set to "off continuously" and all parameters under the "systems" tab are set to "none". Based on manual calculation, I should end up with 141.1 kWh. But I am getting over 2000 kWh, where is it going wrong?
So I am trying to analyze lighting electricity load in my model. First, I simulated my rooms in DIALux to obtain the Wattage and W/m2/100 lux for my light fittings, then I used those values in my internal gains profile for each room in order to calculate the lighting electrical load in IES and then run daylight analysis to assess energy saving (in Radiance). However, the results of the dynamic simulations are over the line. and are clearly in the megawatt region!! Here is a room input sample:
(BTM room weekly profile details)
Usage hours/week: 25.5 hours
number of weeks: 9.1 weeks
Internal gains profile details:
Type: Fluorescent lighting
Maximum sensible gain (W): 608.00 W
Maximum power consumption (W): 608.00 W
Radiant fraction: 0.45
Fuel: Electricity
Variation profile: Set to the weekly profile
Dimming profile: on continuously
My weekly profile is divided into days and there is noting wrong with it. all parameters under the "Room conditions" are set to "off continuously" and all parameters under the "systems" tab are set to "none". Based on manual calculation, I should end up with 141.1 kWh. But I am getting over 2000 kWh, where is it going wrong?