Lennox Introduces Industry’s First Commercial HVAC System that Integrates Directly with Solar Power

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SunSource® Commercial Energy System collects energy from the sun and feeds it directly into a solar-ready Energence® rooftop unit

"The SunSource system aims to be a practical solution for environmental sustainability programs all across America."

Lennox has developed the industry’s first commercial HVAC unit that integrates directly with a solar-energy system. The patent-pending SunSource® Commercial Energy System collects energy from the sun, feeds it directly into a solar-ready Energence® rooftop unit, and supplies any excess electricity to the rest of the building or to the power grid.

Designed to reduce business energy spending and emissions, the SunSource system can effectively double the Energence rooftop unit’s already industry-leading efficiency rating – from 17.0 SEER to an effective efficiency level of 34 SEER* and beyond. In certain regions adding additional solar modules can help the rooftop unit achieve net-zero energy status, as the SunSource system will generate more power than what the rooftop unit consumes. SunSource systems will be available in spring 2011 as a solar ready factory-installed option for 3- to 6-ton Energence rooftop units.

“The SunSource system is just the latest example of Lennox’s commitment to introducing green technologies that will lower the environmental impact of HVAC equipment,” says Larry Wei, Lennox Product Manager for commercial rooftop units. “By pairing an Energence rooftop unit with a solar energy system, building operators can cut their energy bills, lower emissions, lessen their building’s dependence on the electricity grid and demonstrate their strong commitment to the environment.”

Easy to install on almost any size or shape roof, SunSource systems are also safer to operate than traditional solar energy systems because they eliminate the use of a high-DC-voltage line. Each microinverter’s output is limited to 50 volts; in the event of a power loss, the microinverters stop transmitting power to the rooftop unit and the main building panel. The system can also help buildings meet the ASHRAE Green Standard 189.1 requirement to be solar ready, and the LEED® EAC2 on-site renewable-energy credit.

SunSource installation already in place in Arkansas

The first SunSource Commercial Energy System was installed this winter at Lennox’ manufacturing plant in Stuttgart, Arkansas. The Stuttgart installation pairs a solar-ready Energence rooftop unit with 18 solar modules that provide a peak output of 3.2 kW of electricity. The installation was completed in one day by Dallas, Texas, contractor Standard Renewable Energy.

The solar modules’ real-time energy production is recorded by a communications gateway, allowing Stuttgart engineers and managers to monitor the system’s performance from anywhere via an Internet connection. The SunSource system’s panels are expected to capture about 4,400kWh of clean energy per year, eliminating greenhouse-gas emissions equivalent to removing one car from the road for a year, or planting 106 trees.

“We’re continually striving for ways to incorporate sustainable practices and reduce our carbon footprint,” Stuttgart Plant Manager Albert “Skip” King said. “The SunSource system aims to be a practical solution for building owners and managers engaged in environmental sustainability programs all across America.”

To learn more about the SunSource system or other Lennox® products and services, please visit http://www.LennoxCommercial.com.

About Lennox Industries Inc.
A worldwide leader in residential and commercial heating and air conditioning systems, Lennox Industries Inc. is based near Dallas, Texas. Deeply committed to helping consumers and businesses reduce energy needs and lessen their environmental impact, the company offers a wide range of resources for improving efficiency, including a selection of ENERGY STAR® qualified products. Lennox Industries is a subsidiary of Lennox International Inc. and is a global leader in the heating, ventilation, air conditioning and refrigeration markets. Lennox International stock is traded on the New York Stock Exchange under the symbol “LII.” To learn more about Lennox International, visit http://www.lennoxinternational.com. To learn more about Lennox Industries, contact a Lennox sales representative or visit http://www.lennox.com.

*Effective SEER estimates for the SunSource® air conditioning system are based on the U.S. Department of Energy (DOE) annual performance factor (APF) method for heat pumps and air conditioners (10CFR part 430). Estimates of annual solar energy production are calculated for a centrally located city in each DOE heating region, using National Renewable Energy Laboratory’s (NREL) PVWatts, Version 1. The annual solar energy production is solely an estimate for that region and is based upon a fixed-tilt south-facing array free of shading, with a module tilt angle equal to the local latitude of the installation. The annual solar energy production is included in the APF calculation as a reduction of the cooling season power consumption. In this example, the air conditioning unit is an Energence® LGH060H4ES1P (5 Tons/17 SEER) located in Region IV (represented by Omaha, NE at 41° N. latitude) and with six solar modules rated 175 dc Watts each.

For Information, Contact:
Holly Rudolph, Power Creative

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Holly Rudolph
Power Creative
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