Geothermal heating and cooling systems leverage the constant temperature of the earth to efficiently regulate indoor climates throughout the year. By using a ground loop system, these systems are capable of transferring heat to and from the earth, providing a sustainable and energy-efficient solution for both residential and commercial buildings.
Let's delve into the mechanics of geothermal systems
Determining Ground Loop Length
The length of the ground loop is determined by the size of the heating and cooling loads and the ground thermal properties. The loads are defined by the size of the building, type of construction, use of the building, duration of the heating and cooling seasons, and climate. The thermal conductivity of the soil directly impacts the size of the bore field needed. The drilling conditions at the site have a direct impact on the drilling cost. Knowing the drilling conditions allows drillers to better estimate the cost of vertical loop systems.
Conducting a Thermal Conductivity Test
A thermal conductivity test requires the completion of one or more boreholes to the projected design depth. The test circulates water through the boring loop while adding a constant amount of heat. The loop temperatures are measured over a 48-hour period, and the thermal properties of the borehole can be derived from the temperature response over time.
Borehole Specifications
- Bore holes are typically 150 ft. to 450 ft. in length
- Typical systems require between 150 ft. to 200 ft. of bore per ton of peak block load
- At 20 ft. bore spacing, a shallow field of 150 ft. bores requires approximately 1 acre per 100 tons of peak block load
Read more:
Geothermal Heat Pumps: Closed-Loop Surface Water Ground Heat Exchangers & Hybrid Systems
How Do Geothermal Systems Operate?
Benefits of Geothermal Heat Pump (GHP) Energy & Technology
Types of Geothermal Heat Pump Systems
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