Electric lighting energy savings for an on/off photocell control – a comparative simulation study using DOE2.1 and DAYSIM
نویسندگان
چکیده
This paper suggests a method how to predict electric lighting energy savings for photocell controls in daylit spaces taking manual blind control into account. The method predicts lower but supposedly more “realistic” lighting energy savings than conventional simulation approaches. On the other hand, predicted savings are larger than those predicted by ASHRAE 90.1 power adjustment factors. The method is demonstrated in a hypothetical open plan office in Calgary, Canada. A comparative simulation study is presented using DOE.2 and the RADIANCE-based daylighting analysis tool DAYSIM. Simulation results were found to differ substantially between DOE2 and DAYSIM even in the absence of venetian blinds. These discrepancies were attributed to the underlying simulation algorithms and sky models. Despite these differences, both simulation programs yielded energy savings more than twice the static 10% allowed for by ASHRAE 90.1 power adjustment factors for on/off control.
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