Published Findings

Green Proving Ground has completed assessments of the following technologies:

CATEGORY TECHNOLOGY DEPLOY WHEN?1 DEPLOY WHERE? ENERGY/WATER SAVINGS2 PAYBACK3 *
On-Site Power & Renewables 027. Honeycomb Solar Thermal Collector, August 2016 > RN Central hot water systems with electric heating and large uniform loads. NA 10  
Lighting 026. LED Downlight Lamps for CFL Fixtures, April 2016 > R Where advanced lighting controls are not desired or useful. 40-50% 3 *
Energy Mgmt. 025. Socially Driven HVAC Optimization, December 2015 > R, NC Prioritize where thermal comfort is an issue. Savings greatest in facilities that are intermittently occupied with high energy costs and narrow deadbands. 20% cooling, 47% heating Savings - $0.05 - $0.50 ft² *
Lighting 024. LED Fixtures with Integrated Controls, August 2015 > R, NC Consider for retrofits with EUI > 3.25 kWh/ft²/yr and utility rates > $0.10 kWh. 69% over GSA average 9-12 Retrofit; 2-3 New Construction *
Building Envelope 023. EC Windows for Land Ports of Entry, May 2015 > R, NC Facilities where window glare compromises mission-critical outdoor visibility. NA NA *
Lighting 022. Wireless Advanced Lighting Controls, May 2015 > NC Integrate with LED. Consider for retrofits with EUI > 3.25 kWh/ft²/yr and utility rates > $0.10 kWh. 54%, 78% with LED 3-6 *
Water 021. Wireless Soil-Moisture Sensors for Irrigation, April 2015 > PP Potential for greater savings than weather-based irrigation systems because of greater granularity. NA NA  
HVAC 020. Wireless Pneumatic Thermostat, March 2015 > R Facilities with pneumatic control. 43-52% heating, 20% cooling 2-10 *
Water 019. Catalyst-Based Non-Chemical Water Treatment, February 2015 > R, NC Facilities with hard water > 121 MG/L. NA 2 *
Water 018. Weather Station for Irrigation, January 2015 > R Turnkey weather-based irrigation systems recommended. Areas with intermittent rain will have higher savings. 20-40% savings projected 2-4 *
Building Envelope 017. Solar Control Films, January 2015 > R Facilities in climates with hot summers and mild winters, and single-pane clear windows with exposure to direct sun. 22-29% for reflective 5 - 9 *
On-Site Power & Renewables 016. Photovoltaic-Thermal Hybrid Solar System, January 2015 > RN Small facilities, electric rates > $.30, hot climates with large DHW loads and limited roof space. NA 19-98  
Lighting 015. Integrated Daylighting, July 2014 > NC Prioritize where LPD > 1.1 W/ft², EUI > 3.3 kWh/ft². 27% 6 *
On-Site Power & Renewables 014. Wood-Pellet-Fired Biomass Boiler, June 2014 > EOL Facilities in cold climates that use fuel oil and are located within 50 miles of a biomass pellet mill. 85.6% efficiency at a 45% partial load. 5  
HVAC 013. Multistaged Indirect Evaporative Cooler, March 2014 > EOL Climates with relatively few cooling degree days and facilities with long-operating hours. Dry climates—data centers, outside air pre-condition, zone cooler. 80% 17  
HVAC 012. Synchronous and Cogged Fan Belts, March 2014 > R, EOL VAV Fans, retrofit with synchronous drive belts. CV Fans, replace at end-of-life with cogged V-belts. 2-20% 1-4 *
Building Envelope 011. Vaccum Insulated Panels for Roofing, March 2014 > R Only where R-50 is required and retrofits require costly alterations. R-50 insulation is best for single-story buildings in cold climates. 8-10% 42+  
Building Envelope 010. Chromogenic Windows, March 2014 > PP Requires further evaluation of electrochromic windows. Thermochromic windows not recommended at present. 9-10% total, 48-58% reduction in heat gain NA  
HVAC 009. Variable Speed Maglev Chiller, December 2013 > EOL Replacement of rotary screw chillers. 42% 5 *
On-Site Power & Renewables 008. PV Guidance, December 2013 > RN NA NA $2.16/W, avg. cost in 2015  
Building Envelope 007. Hi-R Window Panels, December 2013 > R Buildings in cold climates with single-pane windows. 41% 7 *
HVAC 006. Variable Refrigerant Flow, December 2012 > PP Buildings that are 5,000 to 100,000 ft² with electric reheat in cold climates, with limited room for ductwork changes. 34% projected relative to code-compliant HVAC NA  
On-Site Power & Renewables 005. Photovoltaics, December 2012 > RN Price should drive PV selection. PV effective even in 4-season climates. NA 10 in 2015 (19 @ 2011 pricing)  
HVAC 004. Condensing Boilers, Updated July 2014 > EOL Replacement of conventional boilers. Life-cycle cost effective when 3 -5 % more efficient than high-efficiency boilers. 14% 4-7 *
Energy Mgmt. 003. Advanced Power Strips, September 2012 > R Deploy broadly. 26-48% 1-2 *
Lighting 002. Occupant Responsive Lighting, September 2012 > R Facilities with operating hours > 14, utility costs > $.11 kwh, variable occupancy. 27-63% 6+ *
Energy Mgmt. 001. Wireless Sensor Network, March 2012 > R, NC Data Centers. 17% total, 48% cooling load reduction 2 *

 

*M&V Results Demonstrate Broad Deployment Potential

 

1 Deployment Key:
EOL = End-of-Life
NC = New Construction or Major Renovation
PP = Pilot Project
RN = Renewable
R = Retrofit

2Savings compared to incumbent technology or practice.

3 Payback, expressed in years, is at average fuel cost ($0.11/kWh and $7.5/Mcf)

 

The Green Proving Ground program leverages GSA’s real estate portfolio to test innovative building technologies and provide recommendations on their deployment.

 

Last Reviewed 2016-08-09