Solatube has developed several prototypes for the indirect/direct TDD and gained input from the California Lighting Technology Center(CLTC), AEC, and New Buildings Institute. Technical review of the prototypes through the use of High Dynamic Range imagery has provided solid feedback on the issue of glare and luminance values.
Seven units of the most current prototype concept are installed at Solatube and undergoing further evaluation.
Figure 1: Indirect/Direct Prototype Image
Project team:Solatube, CLTC, SCE (demo support)
Project 3: Cost Effective Demand Response (CEDR)
Field tests for CEDR were de-railed with the request from the demonstration-site facility managers for Underwriters Laboratories® (UL) certified equipment installs. Joel Snook with NEV Electronics has been working through the UL process and is committed to commercializing the CEDR product at some point in the future. The final report for this project is in the final stages of review.
As an alternative, the CLTC received test units from Universal Devices and has performed some functionality testing of the devices. Reliability issues for sending and receiving have been discovered. The CLTC intends to provide written analysis of the DR and PLC issues for these devices.
Project team: NEV Electronics, CLTC, SCE (demo support)
Project 4: Integration of Electric Lighting Controls with Utility Demand Response Signals
This project provided an evaluation of lighting demand response technology implemented in an office setting at 6042A Irwindale Avenue, Irwindale, California. Three, off-the-shelf, advanced lighting control systems (ALCS) - Convia, Universal Lighting, and Lutron - were evaluated for both energy efficiency and demand response capability.
The total demand savings across all three areas of the building for the tuned ALCS totaled 13.02 kW. The below summary table gives the results by system.
Demand was reduced an average of 0.67 Watts/sq ft by the design of the new overhead lighting system and the ALCS tuning. Demand response testing confirmed demand savings could be achieved, ranging from 7.5 to 10 Watts per four-foot lamp at the 50% level setting. Simulation work and light level measurements were performed by the CLTC.
Summary Table: Overhead Mounted Lighting Load (W/sq ft) and Demand Savings (kW) per square foot
| |
Convia |
Universal |
Lutron |
Baseline Measured Lighting Power Density – W/sq ft |
1.13 |
1.25 |
1.39 |
Energy Efficient Lighting + ALCS Tuning Measured Lighting Power Density – W/sq ft |
0.52 |
0.93 |
0.49 |
Energy Efficient Lighting + ALCS Tuning Measured Lighting Power Density Savings – W/sq ft |
0.62 |
0.32 |
0.90 |
Square Footage of Area |
5,516 |
4,896 |
8,945 |
Demand Savings – kW |
3.40 |
1.57 |
8.05 |
Project team: SCE, CLTC
Project 5: Retrofit Integrated Classroom Lighting System (R-ICLS)
Thirteen classrooms at three schools were installed with four different Finelite R-ICLS systems and monitored for an entire school year, which ended May 2009. Pre- and post-light levels were measured. Energy savings were realized and the final report is under development.
Finelite also has announced their new High Performance Recessed product line, one outcome resulting from their participation in this project. A Lighting Retrofit Guide is under development.
Figure 2: Retro-Integrated Lighting Classroom System, Best-Recessed Option from Finelite installed at Davis Elementary School
Project team: Finelite, CLTC
Project 6: Wireless Integrated Photosensor and Motion Sensor (WIPAM) Lighting Control System
WIPAM equipment has been received and the CLTC is installing, commissioning, and testing the system at their site. During the first part of 2010, a demonstration system for a private office and corridor will be installed. Adura continues product development work toward full commercialization.
Figure 3: WIPAM System Architecture
Project team: Adura Technologies, CLTC
