Karina Garbesi

Lighting Controls in Commercial Buildings

Abstract Researchers have been quantifying energy savings from lighting controls in commercial buildings for more than 30 years. This study provides a meta-analysis of lighting energy savings identified in the literature—240 savings estimates from 88 papers and case studies, categorized into daylighting strategies, occupancy strategies, personal tuning, and institutional tuning. Beginning with an overall average of savings estimates by control strategy, successive analytical filters are added to identify potential biases introduced to the estimates by different analytical approaches. Based on this meta-analysis, the best estimates of average lighting energy savings potential are 24 percent for occupancy, 28 percent for daylighting, 31 percent for personal tuning, 36 percent for institutional tuning, and 38 percent for multiple approaches. The results also suggest that simulations significantly overestimate (by at least 10 percent) the average savings obtainable from daylighting in actual buildings.

Catalog of DC Appliances and Power Systems

This document catalogs the characteristics of current and potential future DC products and power systems.

Max Tech and Beyond: Maximizing Appliance and Equipment Efficiency by Design

Max Tech and Beyond Maximizing Appliance and Equipment Efficiency by Design Principal Authors Louis-Benoit Desroches and Karina Garbesi (Environmental Energy Technologies Division) Contributing Consultants James Beck, Independent Consultant (Electronics) Nicole Graeber, California Lighting Technologies Center (Lighting) Gunnar Hovstadius, Gunnar Hovstadius Consulting LLC (Pumps) Michael Scholand, Navigant Consulting Inc. (Fluorescent and HID Lighting) Charlie Sellers, Independent Consultant (Motors) Tom Taranto, Data Power Services, LLC (Air Compressors) Paul Waide, Navigant Consulting Inc. (Air Conditioners) Project Contributors Chris Bolduc Gabriel Burch Griffin Hosseinzadeh Seth Saltiel Lawrence Berkeley National Laboratory One Cyclotron Road Berkeley, CA 94720 July 20, 2011 The work described in this report was funded by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy, Building Technologies Program under Contract No. DE-AC02- 05CH11231.

Radon entry into houses: the importance of scale-dependent permeability.

Soil permeability to air can increase substantially with measurement length scale. We tested the hypothesis that the scale effect could resolve large model underpredictions of radon and soil-gas entry into two experimental basement structures located in natural sandy-loam soil at a field site in Ben Lomond, CA. Previously, the model input for permeability at the site had been assessed based on 0.5-m scale measurements. After determining the soil-structure interaction scale (system scale) to be approximately 3 m, the model input was changed to reflect 3-m scale permeability measurements. This adjustment reduced unacceptably large model underpredictions, of a factor of 3 to 5, to a range near that of acceptable experimental error, 20 to 40%. The permeability scale effect may explain large and persistent model underestimates of radon entry into real houses. The results argue strongly for determining permeability at a length scale consistent with that of the system under study.

Ceiling Fan and Ceiling Fan Light Kit use in the U.S. Results of a Survey on Amazon Mechanical Turk

Ceiling Fan and Ceiling Fan Light Kit use in the U.S.—Results of a Survey on Amazon Mechanical Turk Authors: Colleen L.S. Kantner 1 , Scott J. Young 1 , Sally M. Donovan 2 , Karina Garbesi 1 Contributors: Stacy Pratt 1 , Henry Willem 1 , Bereket Beraki 1 , Sarah K. Price 1 Energy Analysis and Environmental Impacts Department Environmental Energy Technologies Division Lawrence Berkeley National Laboratory Berkeley, CA 94720 Consultant, Melbourne, Australia July 2013 The work described in this report was funded by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy, Building Technologies Program under Contract No. DE-AC02- 05CH11231.