Ground Heat Exchanger – How does it work?

How does it work?

In summer hot air drawn by the recuperator into the air intake is initially cleaned in the coarse filter and when the air passes through the GHE system it transfers heat to the ground and is cooled to approx. 18°C.

The air cooled in this way is not overdried (as it is the case in the traditional air conditioning systems). As a result, there is a pleasant and comfort climate indoors even during extremely hot days.

In winter, when cool air passes through the GHE system it takes heat from the ground and as a result it is heated up to from approx. 0 to 8°C depending on the outdoor temperaturej.

Then the recuperator is started to heat air further by next 10-12 degrees and as a result the temperature of the air supplied to the building is 20⁰C. Finally, it is only required to heat the initially prepared air to the required comfort temperature. This provides additional savings and protects the recuperator against freezing.

The Ground-Therm GHE system is the perfect complement to the ventilation system. In winter it enables ground heat to be used for initial heating of the air supplied to the house. In summer it enables air to be effectively cooled, ensuring comfort climate inside the building.

How to optimally choose the GHE system?

The final decision depends on many factors, including, first of all, a building type that will by provided with the ventilation system. The basic distinction that is worth to pay attention to is the method of running the pipe heat exchanger. There are three basic types:

• multi-pipe system (Tichelmann piping) – the exchanger pipe exiting the building is split into several parallel pipes that are further rejoined together just upstream the ground air intake. The parallel pipes should be properly spaced– depending on their diameter (0.5-1.0 m). The advantages of this solution include compact design that enables the GHE system to be laid even under the foundation slab of a house (or a larger building) and easy selection of optimum size for the required air flow rate. However, the multi-pipe system has the limited possibility of partial installation.

• ring pattern - the exchanger pipe exiting the building is laid around the building. Along its entire length up to the air intake, the pipe maintains a slight fall (at least 2%) to facilitate outflow of water condensing inside the heat exchanger. Condensate is collected inside the condensate chamber located below the air intake. The basic advantage of the ring pattern is its simple design, and its installation is only limited to relatively small buildings.

•meander pattern – in general it is the solution equivalent to the ring one. The exchanger pipe exiting the building is bent in one or several points, forming different shapes on the plot. This solution is one of the most frequently used, because it enables a relatively long component to be laid even on a small plot. The advantages and disadvantages are practically the same as those in the ring pattern.

We encourage you to contact our technical consultant to discuss your project and we will precisely present our solution.

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