Earth Tube Cooling
Jan 16 2016 explore just me s board earth tube cooling heating on pinterest.
Earth tube cooling. An earth cooling tube also known as an earth tube is a long underground metal or plastic pipe through which air is drawn. Earth tubes can work as long as. Poorly designed earth tube systems are probably more common than well designed earth tube systems which is why many earth tubes are eventually capped off and abandoned. Through the combination of its earth tubes installation and concrete building envelope the erc not only meets but exceeds its targets for energy performance with heating and cooling of the building being almost 90 more efficient than canadian energy code requirements.
Earth tubes also known as ground coupled heat exchanger systems aim to take advantage of the cool air beneath your home to keep your house comfortable during even the worst heat waves. The higher the ambient temperature of the earth the less effective it is for cooling and dehumidification. One earth sheltered home owner i spoke with told me that after many years of living in his earth sheltered home and loving his earth tubes his wife told me how much she liked the natural humidity control an air quality test showed that they were bringing in high levels of radon gas. Earth cooling tubes are much less effective in hot humid climates like florida where the ambient temperature of the earth approaches human comfort temperature.
We commonly suggest installing a 4 inch axial fan 12 vdc 80mm computer cooling fan in the end of each earth tube pipe and covering with a protective vent grate. Earth tubes can end in a central terminus box plenum and be fan powered air handler or you can individually fan assist each earth tube pipe as shown below. Electricity free cooling based on ancient global principles. In the 1970s and early 1980s earth cooling tubes received a great deal of attention from architects builders.
The temperature change in the tube air after 150 ft appears to be small. As air travels through the pipe it gives up some of its heat to the soil and enters the house as cooler air. Radon is an inert noble gas 8 times more dense than. That said earth tubes are expensive to install so they are rarely a cost effective way to condition ventilation air.
As we mentioned above the temperature of the ground just a couple of feet beneath our feet is a usually a comfortable temperature anywhere between 50 and 70. See more ideas about geothermal energy geothermal passive solar. But there is a diminishing returns effect as the tube gets longer and longer. Somewhere around 75 to 100 ft might be pretty close to the sweet spot.
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