Literature reviews

02.01.13 | In this report, the authors discuss the major renovation of the New York Times building in Manhattan, New York. The New York Times occupies 19 floors and 628,000 gross square feet of their building. They recently undertook a major renovation...
04.29.13 | In this paper, the authors conduct a meta study of available research on the energy savings associated with lighting controls. In total, they summarize 88 papers, comprising 240 savings estimates of 4 controls strategies; daylighting, occupancy...
04.29.13 | The amount of solar energy that a building receives in a year greatly affects its energy usage. In densely developed areas, a building can shade its neighbors, thereby impacting their energy usage. The Solar Envelope is a zoning tool that...
04.29.13 | The authors discuss the daylighting design process associated with the Research Support Facility, a 220,000 ft2 office building on the National Renewable Energy Laboratory campus. From the beginning of design, the project had a goal of low energy...
04.29.13 | This website hosts a variety of daylighting publications and case studies.
04.29.13 | DOE-2.2's daylight control modeling methodology has been shown to be inaccurate. An and Mason developed a methodology to more accurately predict the lighting savings from implementing daylight controls by adjusting the DOE-2.2 lighting schedules...
04.29.13 | Genetric algorithms are a powerful method for determining the optimal set of inputs in order to achieve a desired result. In this paper, Gagne and Anderson develop a genetic algorithm for determining the set of facade parameters (window-to-wall...
04.29.13 | Daylight modeling and energy modeling have evolved on similar, but parallel, paths. Both are powerful tools that have yet to be married in a seamless way. This paper is a case study of the impact that these tools had on the design of the National...
04.29.13 | In this paper, Reinhart et al. investigates various dynamic daylight performance metrics and compares their advantages and disadvantages as opposed to static metrics. Daylight factor is one such static metric that is defined as the ratio of internal...
04.29.13 | Noell-Waggoner describes the need for improved lighting and more daylighting in nursing homes. Age-related changes to the eye tend to decrease the amount of light that reaches the retinue. This leads to higher instances of accidents and disrupted...
04.29.13 | In this paper, Reinhart explores the validity of various daylighting rule of thumb (DRT) design methodologies by checking their accuracy against Radiance-based models in Daysim. Specifically, the paper investigates the rule that a sidelit daylit...
04.29.13 | The Heschong Mahone Group, supported by Southern California Edison, Pacific Gas and Electric and the Northwest Energy Efficiency Alliance, conducted this study of existing daylight-responsive lighting controls in sidelit buildings. The study...
04.29.13 | In October 2003, the California Energy Commission released three reports prepared by the Heschong-Mahone Group under the Public Interest Energy Research program. These reports describe epidemiological studies of the impact of daylight on:...
04.29.13 | The authors summarize eight cases studies of various projects that employed daylighting controls. Each project encountered issues and the authors analyze the failure mechanism and how the users coped with them. A method of failure analysis is...
04.29.13 | The IESNA Lighting Handbook indicates that lighting control performance information is not readily available and that it depends on indoor daylight levels, size of space, work schedules, and occupant attitude and training. In this paper, Reinhardt...
04.29.13 | The Heschong Mahone Group, supported by the California Energy Commission, conducted two field studies to determine the impact of the daylight and windows on office worker productivity. Both studies were of office workers at the Sacramento Municipal...
04.29.13 | This paper evaluates the performance of photosensor-controlled electric lighting under different configurations of office spaces. Four offices spaces in Ottawa, Canada were studied, each having a floor area of 14 m2 (150 ft2), height of 3 m (9.8 ft...
04.29.13 | In this paper, Oakley et al develop a testing method for measuring the amount of natural daylight and passive ventilation a light pipe introduces into a test chamber. Two light pipes were analyzed, both having diameters of 0.215 m and lengths of 2....
04.29.13 | Rubinstein et al. discuss commissioning and calibration of lighting control systems. Specifically, they address the importance of both as well as advice for effective performance. In this context, commissioning is a process for ensuring the...
04.29.13 | The authors performed a lighting retrofit on an elementary school cafeteria in Florida. The cafeteria had 70% glazing on its east and west facing facades, as well as vertical blinds. The retrofit replaced the magnetically-ballasted, 40W T12 lamps...
04.29.13 | Rubinstein et al. analyze three different algorithms for dimming electric lights in response to changing daylight availability. The three basic components of a photo-electrically controlled light system are described: a photosensor for measuring...

Initiatives

05.14.14 | In November 2013, we realized a dream we've had for nearly two decades—to live our mission by locating our headquarters in a green building.Our space tells an important economic story. The LEED Platinum Core and Shell building is developer-driven,...
06.13.13 | LEED v.3.0 and Daylighting—Daylighting Isn't Just for Views Learn how to get LEED points for EA credits as well as views. LEED™ was created by the US Green Building Council as a guideline to help owners and design/construction professionals create...
06.13.13 | LEED v.2.2 and Daylighting—Daylighting Isn't Just for Views Learn how to get LEED points for EA credits as well as views. LEED™ was created by the US Green Building Council as a guideline to help owners and design/construction professionals create...
06.04.13 | Proper commissioning can lead to energy savings—often 60% or more Daylighting control, or daylight harvesting, has become a common energy savings strategy in many sustainable building projects, but several barriers still prevent successful...
12.12.12 | Good daylighting creates beautiful, appropriately lit spaces while saving energy. Success comes from a combination of art and science, architecture and engineering. Rather than relying solely on electric lighting during the day, daylighting brings...

Publications

06.04.13 | Automatic daylighting control is an energy savings strategy employed in many sustainable building projects. While considerable effort is often expended in the architectural and lighting design of daylighting control strategies, the actual execution...
09.20.12 | Demonstrating actual lighting and HVAC impacts from high performance glazing and daylighting strategies is difficult. While many schools and other buildings have been designed and built using these strategies, attempts to compare energy consumption...
06.14.13 | The Association of State Energy Research and Technology Transfer Institutions, Inc. (ASERTTI) and the National Association of State Energy Officials (NASEO) with the Department of Energy (DOE) and the EnergySmart Schools Program conducted a joint...
09.20.12 | Report presents the results of detailed energy use monitoring of the Hoffman Corporation headquarters, a daylit building located in Appleton, Wisconsin. Includes analysis of lighting energy use, chiller energy use, lighting levels and employee...
09.20.12 | Study developed an approach to a statewide daylighting program (implemented as ECW's Daylighting Collaborative) ordered by the Public Service Commission of Wisconsin in 1996. The Commission order stated that the program should address demonstration...

Tools

11.07.11 | Play and learn Our Back-of-the-Envelope calculator is a learning tool that allows anyone to interact with a building as an energy system. You can see real-time energy connections between building components, isolate the effects of changing a single...

Videos

12.19.13 | Frank Greb and Scott Hackel share the vision for our new space and give a brief technical overview of the HVAC system (including variable refrigerant flow geothermal) and lighting/daylighting strategies.
12.18.13 | Daylight modeling is important for understanding light levels, environmental quality and energy saving impacts of early design decisions. Many daylight modeling tools have been developed, each with their own strengths and weaknesses. In this video,...