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We have a geothermal heat pump system at a new high school. The system has 264 400' deep wells. Starting at the beginning of this month we have noticed (through the makeup water meter) over 400 gallons of water have entered the system. There are no leaks in the building. No leaks have been found on site. And the water flow is not constant. The water flow actually happens when the well field loop pump is running. The static pressure of the system is at 28 psi when the loop pump is off. As soon as the pump comes on the system pressure drops to 15 psi and slowly rises back up to 25 psi. Meanwhile makeup water is entering the system.
The only odd thing with the way the system is piped is that the loop pump is pulling water from the well field (not pushing into the field) and it pumps water towards the suction side of the building pumps. So when the building pumps and the loop pumps are running the building runs at a much higher pressure compared to when only the building pumps run.
Any ideas on why we are seeing this makeup water enter the system. And if we have no leaks where is it going?
The system has been running for 6-9 months before this started happening.
One thought I had was this sympton somewhate corresponds to when summer school started and the temperature outside increased. Could we be seeing the well piping expand due to increased loop temperatures?
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