Geothermal Heat Pump Project LOGO!

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Connecting and Testing Vertical Collector for the Heat Pump

The first photo is showing a testing procedure for vertical collector. Each vertical collector should be tested before connected to the heat pump. It is very small possibility of leaking, but you must be 100% sure. Testing is accomplished with water and a water pump (hand driven) which can produce a pressure up to 5 bar. Pressure meter must be stable at least 1 hour – 1 hour the same pressure.

The second photo is showing pipes already connecting vertical collector and heat pump. There is a 0,75 to 1 meter deep channel where pipes are placed.

Pipes for Geothermal Collector

Pipes for geothermal collector are very important part of heat pump system. For 100 meters of vertical geothermal collector that is inserted into drilled hole, we usually need 400 meters of strong pipes (2 pipe loops inserted in one hole). If we calculate the water pressure at the end of 100 meters collector (100 meters deep under the surface) we get 10 bars (1 bar / 10 meters). We must add another 2 bars to get optimal working conditions for the heat pump. That is way pipes must be strong and must stand at least 12 bars of pressure for 100 meters collector. We have used 16 bar pipes (32mm in diameter, 3 mm wall thickness, PE 100, SIST EN 12201) from Slovene (Europe) producer.