These studies examine how data might be used to improve the energy performance of lighting and other building systems, and how data quality affects its usability.
ENERGY REPORTING ACCURACY
Emerging energy-efficient building systems (e.g., lighting, HVAC) increasingly have greater functionality, which often shows up in the form of more operating modes. This increased functionality, however, makes it more difficult to estimate energy consumption. A PNNL study explores the reporting accuracy of market-available connected electrical outlet devices, using a custom-developed test setup and method that were adapted from industry standards.
- Characterization and Analysis of the Energy-Reporting Accuracy of Connected Devices (Report, June 2020)
CALIBRATING MEASURING EQUIPMENT
An increasing number of lighting and other building systems are capable of reporting their own energy consumption. Evaluation of the accuracy of any such data typically involves comparing the reported data with measurements from a calibrated laboratory-grade instrument. A PNNL study describes best practices and provides a tailorable specification template for requesting calibration of energy measuring equipment. A follow-on study (in progress) addresses environmental measuring equipment.
- Specifying Calibration of Energy-Measuring Equipment (Report, March 2020)
- Straight from the Device (Article, September 2020)
- Specifying Calibration of Environmental Sensors (Report, September 2020)
0-10V CONTROL FOR STREETLIGHTS
While 0-10V control methods have long been popular for controlling the light output of dimmable devices, standardized implementations have never mandated consistent, predictable responses to a given control signal. ANSI C137.1 standard was developed in part to reduce the response variation seen across products. A PNNL study characterizes the response to 0-10V controls signals of more than 20 different market-available LED outdoor cobrahead luminaires (typically used for street-lighting applications) that claimed dimmability via a 0-10V interface, and evaluates the potential impact of the ANSI standard.
- To Dim or Not to Dim: Why Is That Still a Difficult Question? (Article, May 2020)
- An Exploration of the Response of LED streetlights to 0-10v Control Signals (in progress)
INDOOR OCCUPANCY SENSOR PERFORMANCE
PNNL conducted a literature review exploring test methods for characterizing the performance of new and novel indoor occupancy sensors that might facilitate significant energy savings in buildings while minimizing occupant dissatisfaction. A new test method that leverages the best ideas discovered via the literature review is under development in the CLTB. This work will inform a new study that compares and contrasts the performance of several commercially-available occupancy sensor technologies with the status quo.
- A Review of Existing Test Methods for Occupancy Sensors (Report, August 2020)