Solar Thermal

Closeup of solar thermal tubes

Solar thermal systems can be installed alongside solar power systems to supplement climate control and improve energy efficiency.

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Solar thermal energy, which involves the heating of water through solar collectors, can be used to supplement the energy efficiency of a building’s existing HVAC system, or as part of a new hybrid geothermal/solar system. Separate from Ameresco’s capabilities in photovoltaics, which convert solar energy directly into electricity, our solar thermal projects make better use of the heat that the sun freely supplies to buildings.

Ameresco finances, designs, builds, operates and maintains solar thermal systems as part of a broader energy management approach that is focused on cost savings through energy efficiency. Solar thermal collectors, installed on-site and often placed on the roofs or walls of commercial buildings, collect solar heat that is used for heating, cooling and hot water. When solar thermal is used to supplement geothermal as a hybrid system, organizations can often cover 100% of these HVAC functions with clean, renewable energy.

Passive Solar Heat

In additional to solar thermal systems, which are active mechanical systems, Ameresco can ensure that facilities are maximizing their use of solar heat by passively utilizing the direct radiation on a building’s structure. Ameresco’s experienced energy services engineers can design buildings to capture more of the sun's radiation, and building materials can be chosen to absorb and retain the heat, slowly releasing it at night or on cooler days.


Creating a Passive Solar “Chimney”

Each day, a building gains a portion of its heat just from sunlight hitting its exterior.  By creating a passive solar "chimney," buildings can retain or expel more of this heat as needed. The solar chimney is designed with a sun-penetrating glass shield on a southerly or westerly-facing solid wall, with a cavity several inches deep between the layers. With the sun's heat concentrated between the glass shield and the wall, a convection of rising heat is created, which is captured by a heat-recovery ventilator (HRV) at the top, which then circulates the heat into the building on cool days and expels it upward on warm days.



See more case studies on Solar Energy

Arizona State University stadium with solar panels

Arizona State University

The roof of Sun Devil Stadium now hosts nearly 7,000 solar thermal tubes that produce the equivalent of 1,411 kW DC, or 2,540,590 kWh annually.

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Why Choose Ameresco?

Our solar PV team has an advanced understanding of regulations and is involved with ongoing rulemaking at the local, utility, state and federal levels. We have acted on behalf of our customers to secure all permits and incentives to keep projects on schedule and at the agreed upon price. Our engineers and construction teams have designed and/or built more than 50 megawatts of solar PV projects.

Ameresco has the in-house technology, staff, and systems to continuously monitor solar PV operations, report alarms and problems, and dispatch maintenance staff using our work order management system. We also test and re-commission each site once a year. This O&M experience provides feedback to our design engineers, creating a virtuous cycle for continuous design improvements.

Ameresco offers a full spectrum of services from system conceptualization to support once the system is complete. We can develop, engineer, build, own, operate, finance and maintain (with in-house or outside staff), providing a complete solution. We can operate and maintain any existing solar power system or provide financing through a Solar PPA or ESPC for new construction.

Ready to learn more? Call us at 1-866-263-7372 or contact us online.