Here are a few more pics. The two tanks are a hot and cold tank for testing the HP, one on the evap and one on the condenser then I can check the optimal flow rate on each side.
The evap is actually attached to a glycol line that goes between the plate HX and a big outside coil. I will inject into this some solar heated glycol to try and improve the COP when the heat is available.
The fittings are actually two unions, one for the HX and a reducer to bring it down to 1.25" for the tubing. There is a fibre washer on the union (not shown)