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Geothermal ventilation

So, if your house is hermetically sealed and all your walls, windows and doors properly insulate your interior space, it's time you got acquainted and built in ENERGY-EFFICIENT GEOTHERMAL VENTILATION.
The technology is based on the fact that ground due to its enormous weight accounting for billions of tonnes is a giant thermal accumulator. It takes months to make it change its temperature in either way (for example, during interaction with the atmosphere). What's more, it only concerns upper layers of ground (1.5-2 meters). However, the temperature at the depth of 3 meters remains constant and comes up to +15 ..+17 °C. More exact information about parameters can be found in specialized references on a particular geographic area.
It would be unreasonable not to take advantage of such natural thermal constanta.
Duct system that performs a function of heat exchanger, in terms of this technology is  laid in the ground.
The air itself is a heat transfer medium. The air that passes through the air pipe cools the soil through the wall duct. Then cooled and filtered air is distributed around the premises. High-inertia system is also important, because sharp fluctuations of temperature of external air temperature at a depth of more than 1.5 m remains constant.

The size and length of  pipes of an underground heat exchanger, method of their installation in the first place are determined by the amount of air required.
For providng air stream turbulence, on the one hand, and the required duration of air presence in underground pipelines (for ground cooling), on the other, the speed of movement should be 1-4 m/s (value obtained empirically).
Necessary  length of the air duct is measured in the following way:  1 meter of pipe per 5 m3/h of inlet air.
Thus,  the volume of air exchange in the range of 120-250 m3/h  usually requires piping length of 30-50 m.

In order to reduce the cost of earthwork we recommend to install pipes around the building (circular laying).  

Using filters in the air intake ducts and  antimicrobial silver particles layer on the inner surface of the pipe help to prevent the reproduction of harmful microorganisms, enforce high safety performance and optimal microclimate in the House. Condensation may appear in the process of cooling inlet air in the piping. High longitudinal stiffness of the pipes eliminates hole-shaped chambers where it can get accumulated.

In the buildings without basements condensation is accumulated in T-branch at the lowest point of the basement and transferred to a special well, from which it is pumped with the help of a conventional pump activated by the liquid level sensor.

If there is a basement in the building condensation can be transferred to the house sewage system.

Geothermal heat exchangers for large buildings

For buildings with large areas, where the system of  underground ducts is used mainly for partial air-conditioning, heat exchanger's pipe-laying, usually done according to  Tichelmann scheme. The diameter of the pipes must comply with the capacity of the ventilation system.

When laying pipes around the house their must be a distance to walls or other piping of at least 1 m. Laying in the pit that the registers. co-hosting pipe axis distance between them-from 1 m. At concurrent distribution of pipes the axial distance between them must be at least 1m.