Water To Earth
An alternative to the earth-to-air heat exchanger is the "water" to earth heat exchanger. This is typically similar to a geothermal heat pump tubing embedded horizontally in the soil (or could be a vertical sonde) to a similar depth of the earth-air heat exchanger. It uses approximately double the length of pipe of 35 mm diameter, e.g., around 80 m compared to an EAHX of 40 m. A heat exchanger coil is placed before the air inlet of the heat recovery ventilator. Typically a brine liquid (heavily salted water) is used as the heat exchanger fluid.
Many European installations are now using this setup due to the ease of installation. No fall or drainage point is required and it is safe because of the reduced risk from mold.
Read more about this topic: Ground-coupled Heat Exchanger
Famous quotes containing the words water and/or earth:
“Over the water come
Children from homes and children’s parks
Who speak on a finger and thumb,
And the masked, headless boy.”
—Dylan Thomas (1914–1953)
“The roots of the grass strain,
Tighten, the earth is rigid, waits—he is waiting—
And suddenly, and all at once, the rain!”
—Archibald MacLeish (1892–1982)