Canadian wells

AN ECOLOGICAL, ECONOMICAL AND SUSTAINABLE SOLUTION

The Canadian well is a geothermal heat exchanger consisting of a series of horizontal or vertical tubes buried in the ground or a labyrinth of concrete walls buried in the ground, in which the outside air passes through a ventilation monoblock or a heat pump.

This passive technical element, therefore without any mechanical and mobile element, makes it possible to preheat the new air drawn in during the winter and to cool it during the summer. All this is free of charge and without polluting emissions. A very simple operation, but it was necessary to think about it. The economy that a Canadian well provides for double-flow ventilation systems or for heat pumps, is simply excep-tional, durable, reliable and economical.

In the 37 years of its existence, ERTE has built no less than 15 Canadian wells. Simple and efficient, our expertise and our installations allow you to make great energy savings and ensure optimal comfort. The Canadian well is a system that is made to last. An ecological solution that lasts for 50 years or more, just like buildings.

The example of WMO's canadian well

The Canadian well of the WMO (World Meteorological Organization) has been installed in the foundations of the underground parking lot, taking advantage of the excavation necessary for the latter. It consists of two networks of PE pipes in parallel, laid out in a lean concrete backfill 15 m below ground where its temperature is always around 15°C. The air is sucked in through two vents above the parking lot and, after passing through the tubes of the Canadian well, it is led to the inlet of the ventilation monoblocs and then to the heat exchanger with a nominal flow rate of 220’000 m3/h.

During the summer, the coolness of the ground surrounding the tubes is used to cool the offices. At the end of the warm summer season, this huge thermal mass has warmed up to about 25°C and is used to preheat the cold outside air for the winter. In spring, this mass has given up its heat to the air and has cooled down to about 3 to 5°C. It should be noted that the greater the temperature difference, the better the performance of the Canadian well. During the summer, the average ground temperature at the center of the heat exchanger follows the average outdoor temperature fairly closely, with a lag of a few weeks. The characteristic life span of the storage can therefore be considered to be of this order of magnitude, which allows the gain of fresh air for cooling mainly in early summer. This period of cooling use can be extended if the control system takes the precaution of regenerating the storage by using the fresh air at night whenever its temperature is lower than the ground temperature. This function has been planned for the WMO.

On the other hand, the winter period is characterized by a stagnation of the field temperature between 3 and 5°C, clearly above the low outdoor temperatures. It is likely that the extracted heat is regenerated by ground heat from deeper layers, with a dephasing of a few weeks to a few months.

Conclusions

Our experience with Canadian heat exchangers allows us to draw the following conclusions:

  • The thermal energy gained is significant, while the electricity consumed specifically to transport the air through the Canadian well is low. The electrothermal gain factor varies from 10 to 50 depending on the season, temperature, intensity of use, air flow rates, and the number and diameter of the tubes. In comparison, this amplification factor varies from 3 to 5 for a heat pump and from 8 to 15 for a double flow ventilation.
  • The energy savings that can be achieved in winter are not fully cumulative with other air energy recovery systems.
  • The most interesting summer potential lies in administrative buildings due to their high internal heat load.
  • The operation of a heat exchanger is compatible with the MINERGIE standard and positive energy buildings (BEP).
  • The lifespan of a Canadian heat pump is 50 years or more, which is incomparable to mechanical systems and devices, which last between 15 and 25 years.
  • A Canadian well that cannot be worn out for at least 50 years, associated with a photovoltaic solar installation that produces solar electricity almost without breakdowns for 35 to 50 years (no mechanical parts), associated with a double flow ventilation monobloc with a life span of 50 years where only the inexpensive moving parts need to be replaced halfway through, combined with a PACAir-Water modulating system that has a 20 to 25 year life span, gives the best, most reliable, most durable overall energy system that harnesses the most solar and geothermal energy with the highest efficiency and annual coefficient of performance available.

No other system can match this SUNERGIE® system for producing heat so elegantly for heating and hot water, but also for cooling in summer.

ERTE CONSULTING ENGINEERS PLC is an engineering consultancy specialized in engineering and installation of building techniques. We plan, we calculate, we coordinate and above all we realize and optimize your installations to reach the best possible energy efficiency, in the respect of the environment.

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Canadian wells

AN ECOLOGICAL, ECONOMICAL
AND SUSTAINABLE SOLUTION

The Canadian well is a geothermal heat exchanger consisting of a series of horizontal or vertical tubes buried in the ground or a labyrinth of concrete walls buried in the ground, in which the outside air passes through a ventilation monoblock or a heat pump.

This passive technical element, therefore without any mechanical and mobile element, makes it possible to preheat the new air drawn in during the winter and to cool it during the summer. All this is free of charge and without polluting emissions. A very simple operation, but it was necessary to think about it. The economy that a Canadian well provides for double-flow ventilation systems or for heat pumps, is simply excep-tional, durable, reliable and economical.

In the 37 years of its existence, ERTE has built no less than 15 Canadian wells. Simple and efficient, our expertise and our installations allow you to make great energy savings and ensure optimal comfort. The Canadian well is a system that is made to last. An ecological solution that lasts for 50 years or more, just like buildings.

The example of WMO's canadian well

The Canadian well of the WMO (World Meteorological Organization) has been installed in the foundations of the underground parking lot, taking advantage of the excavation necessary for the latter. It consists of two networks of PE pipes in parallel, laid out in a lean concrete backfill 15 m below ground where its temperature is always around 15°C. The air is sucked in through two vents above the parking lot and, after passing through the tubes of the Canadian well, it is led to the inlet of the ventilation monoblocs and then to the heat exchanger with a nominal flow rate of 220’000 m3/h.

During the summer, the coolness of the ground surrounding the tubes is used to cool the offices. At the end of the warm summer season, this huge thermal mass has warmed up to about 25°C and is used to preheat the cold outside air for the winter. In spring, this mass has given up its heat to the air and has cooled down to about 3 to 5°C. It should be noted that the greater the temperature difference, the better the performance of the Canadian well. During the summer, the average ground temperature at the center of the heat exchanger follows the average outdoor temperature fairly closely, with a lag of a few weeks. The characteristic life span of the storage can therefore be considered to be of this order of magnitude, which allows the gain of fresh air for cooling mainly in early summer. This period of cooling use can be extended if the control system takes the precaution of regenerating the storage by using the fresh air at night whenever its temperature is lower than the ground temperature. This function has been planned for the WMO.

On the other hand, the winter period is characterized by a stagnation of the field temperature between 3 and 5°C, clearly above the low outdoor temperatures. It is likely that the extracted heat is regenerated by ground heat from deeper layers, with a dephasing of a few weeks to a few months.

Conclusions

Our experience with Canadian heat exchangers allows us to draw the following conclusions:

  • The thermal energy gained is significant, while the electricity consumed specifically to transport the air through the Canadian well is low. The electrothermal gain factor varies from 10 to 50 depending on the season, temperature, intensity of use, air flow rates, and the number and diameter of the tubes. In comparison, this amplification factor varies from 3 to 5 for a heat pump and from 8 to 15 for a double flow ventilation.
  • The energy savings that can be achieved in winter are not fully cumulative with other air energy recovery systems.
  • The most interesting summer potential lies in administrative buildings due to their high internal heat load.
  • The operation of a heat exchanger is compatible with the MINERGIE standard and positive energy buildings (BEP).
  • The lifespan of a Canadian heat pump is 50 years or more, which is incomparable to mechanical systems and devices, which last between 15 and 25 years.
  • A Canadian well that cannot be worn out for at least 50 years, associated with a photovoltaic solar installation that produces solar electricity almost without breakdowns for 35 to 50 years (no mechanical parts), associated with a double flow ventilation monobloc with a life span of 50 years where only the inexpensive moving parts need to be replaced halfway through, combined with a PACAir-Water modulating system that has a 20 to 25 year life span, gives the best, most reliable, most durable overall energy system that harnesses the most solar and geothermal energy with the highest efficiency and annual coefficient of performance available.

No other system can match this SUNERGIE® system for producing heat so elegantly for heating and hot water, but also for cooling in summer.