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Monthly Blog

Terraforum:
Future-Proofing with Geo-Exchange


“If it ain’t broke, don’t fix it.” This adage of using time tested methods to solve modern problems resonates particularly well with geo-exchange systems. A technology developed in the early 1900’s that gained popularity after the second world war, many geo-exchange systems have out lasted their respective buildings, with lifespans of over 50 years! But are these systems future-proof? Let’s examine the risks and benefits of geo-exchange systems and evaluate their suitability as a future proof solution.


How they work


Geo-exchange systems are Ground Source Heat Pumps (GSHP), meaning they use a series of liquid filled loops to store energy. Being 20 feet (6m) below ground these loops are insulated from the volatile surface temperatures and are an efficient way of regulating building temperatures. The system stores thermal energy by extracting the heat from the air and transferring it into the loop. This process will leave the air cool and creates an air conditioning effect in the warm months. Then in the cooler months the process is reversed, and the loop releases the heat back into the air and provides heating.


De-Risking


As we mentioned, geo-exchange systems are known for their durability. The underground loop boasts a lifespan of 50+ years, and the heat pumps typically remain effective for up to 25 years. This lifespan surpasses that of conventional HVAC systems, which usually requires replacement every 15 years. This makes geo-exchange systems a desirable choice for their longevity, but are they the correct choice for the future?


Future-Proofing


While the world turns its focus to energy systems, resources and costs are being constrained. Heightened regulation and public demands to discourage the use of fossil fuels is peaking at a time of high credit and capital costs. As these energy costs increase, geo-exchange systems are holding steadfast as they are less resource intensive and don’t use carbon fuel. Geo-exchange systems use up to 60% less energy compared to conventional ones - which is more important than ever as our ever increasing reliance on energy intensive technology adds additional strain on the electrical grid.


This strain is particularly evident during climatic extremes where there may be  significant power outages during periods of intense cold and severe heat waves. For example, the state of California has experienced recurring brownouts during heatwaves, notably in August 2020, when millions were left without power as air conditioning usage surged. Conversely in Canada, the province of Alberta faced grid challenges this year during cold snaps, leaving people struggling to get heat as electricity demand reached record highs. However, buildings using geo-exchange systems help reduce the electrical demand which ensures a stable and reliable power supply during times when it is needed most. With a reduced energy bill, no reliance on carbon, and a long lifespan, geo-exchange systems are proving to be the best choice for future-proofing developments.




What are the Risks?


Geo-exchange systems utilize the Earth as a thermal battery by storing and releasing heat into its loop. However, this heating and cooling cycle needs to be maintained to ensure the system performs appropriately. What do we mean by that? Well, the system can store too much or not enough heat. This occurs as a building's energy needs change over time due to external factors such as sun exposure, insulation deteriorations, or global temperature changes. While these factors can create an imbalance in the system, it takes years before the effects are seen. The results would be a lack of heating or cooling during peak temperatures. If the loop was ever compromised it may require external resources to get it back to equilibrium, but it can still be achieved. However, all of this can be avoided with proper monitoring and maintenance.


This monitoring and maintenance is a standard service that Subterra’s clients enjoy. We call it the Subterra Guarantee: our dedicated team of in-house experts ensures a balanced field by monitoring the borefield’s health every 30 minutes and making the necessary operational corrections. Our complex models consider all the aspects that affect the buildings throughout the year. Slight changes can be made well in advance to keep the loop balanced without disrupting the building or its residents. Proactive management not only allows us to predict the system’s performance but use it to its full potential. That’s the Subterra Guarantee.


Written By: Konrad Bald

FOR MORE INFORMATION, REACH OUT TO:

Briana Gagliardi

Marketing & Communications Manager

marketing@subterrarenewables.com

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