Dual-energy systems with heat pump
Dual-energy systems whose electrical part is composed of a heat pump present certain specificities. A heat pump at optimum capacity can usually provide warmth and comfort with no assistance up to an outdoor temperature of just a few degrees above freezing. This outdoor temperature is called “equilibrium temperature” of the heat pump. A dual-energy system with a heat pump of the air/air type normally operates as follows :
- When the outdoor temperature is higher than the equilibrium temperature, the heat pump itself undertakes the demand for heating.
- When the outdoor temperature goes down to the level of the equilibrium temperature or lower, the heat pump must be supported by another source of energy.
- When the outdoor temperature drops under the normal permutation temperature of the system (-12° C or -15° C), the heating pump’s functioning is blocked and the complementary energy source undertakes all the need for heating on its own.
The advantages of the heating and air-conditioning systems based on geothermal energy
- 67% up to 70% of energy saving compared to a conventional heating system, 35% savings on hot water and 50% on air-conditioning.
- It offers a better quality of the air through a gentler heat.
- Constant temperature all year round.
- Since the complete unit is installed indoors, your system’s operating life will be prolonged (25 years and more)
- Requires very little maintenance.
- Clean and renewable source of energy.
- The geothermal system does not emit CO2, which is the major element of pollution.
- No fire or smoke.
- No risk of vandalism, the system is installed indoors.
- Increases the resale value of your house.
- Savings are bigger than your investment since the very first year.
- Significant reduction of your energy bill, costs are related to the maintenance of your heating system and insurance.
- It can be favourably combined with radiant heating.
Source: natural resources, Canada and Hydro-Québec
How does it work:
You have on your property a source of inexhaustible energy that could be exploited for free. Since the soil temperature remains constant during the entire year at around 9°C, the geothermal heat pump allows you to efficiently heat and cool your property in a safe way and throughout the whole year.
Vertical loops are manufactured using HDPE pipes that are hidden in holes dug in the soil. The holes range in size from 15 to 100 m in depth and their circumference is between 10 and 12 cm. Two pipe lengths, “U profile”. Once the pipes are placed in the drill holes, they are filled with clay.
As their name suggests, these loops are buried horizontally, usually at a depth of 2 to 2,5m – although it could vary from 1,5 to 3 m or more. Ditches are excavated using a backhoe; a chain trencher might also be used depending on the soil composition.
These two loops can be installed in a very cost-effective way in a property, close to a lake or a pond that absorbs the energy of the sun during summer. All you need is just a water surface of 2 to 2,5 m of depth all year round, which allows to protect the loop from waves and ice pile-ups.