Photos that wouldn't fit
The circuit drawing of the refrigerant flow counter current to the water/glycol flow (see previous post). In this the blue is the refrigerant and the magenta is the water/glycol. If you switch the coupled (4 way) valves you see that the flow is always counter current. Any circuits I had seen in comercial GSHP the reversing valve had either the condensor or the evaporator in a parallel flow. Maybe the engineers had a contingency for this I'm not sure. Many years back in biology class we had learned the value of counter flow with blood gases, kidney function or the class demonstrated hot and cold water as seen here.
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