Lighting Power Density in LEED v4.1 MEPC Calculator

Gopinath Vasu

LEEDuser Basic Member

3 thumbs up

November 18, 2022

Hi,

I have a question in LEED v4.1 Minimum Energy Performance Calculator.

The "6a_Lighting Counts tab" takes the input of Occupancy sensor type in the proposed design for each space. However, the model inputs tab in this sheet doesn't takes in to account of the reduction factor. Further, Table 6.2: Summary in"6b - Genreal Lighting" Type shows total modeled input power for Proposed Design by including the reduction factor and Baseline Design without any reduction factor.

Kindly clarify on how to model the occupancy sensor reduction factor in the Proposed Design Model and Baseline Model.

Thanks,
Gopinath Vasu

Post a reply

Gopinath Vasu

LEEDuser Basic Member

3 thumbs up

Wed, 12/07/2022 - 05:37

Hi, can anyone help me to find the Interior Lighting Model Inputs to be considered for Baseline and Proposed model from Minimum Energy Performance Calculator? Thanks,
Gopinath Vasu

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Wed, 12/07/2022 - 19:45

The baseline interior lighting power densities (LPDs) are found in ASHRAE 90.1-2016. The proposed LPDs are determined from the actual project's lighting design.

Tyler Thumma

7Group

LEEDuser Expert

65 thumbs up

Fri, 12/16/2022 - 14:49

The Proposed LPDs should be modeled using the values calculated in the "Reference Values" column of the 6a - Lighting Counts tab. This includes the occupancy sensor credits (where allowed). Note that for spaces where occupancy sensors are required in the Baseline (such as Conference/Meeting/Multipurpose Rooms), a credit is not applied. The Baseline LPDs should be modeled using the values in the Model Inputs - Baseline LPD column.