Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
I am working on a large geothermal project. I am pumping water from a large geothermal loop field to multiple buildings a few hundred feet a way. In each building is a geothermal heat pump with a heat exchanger. Each heat pump uses a valve to allow water to circulate inside the heat exchanger and when it is satisfied it slowly closes.
The pump will be controlled by a frequency drive that will operate off of pressure.
The pumping station is located at the loop field underground. This is where the expansion tank, along with the pump will be located. The elevation rise from the pumping station to one of the legs of the system is estimated to be about 20ft, while the rest of the system will be relatively even.
The system volume is 3000 gallons of water, 21% antifreeze (methanol?)
The design Temp is 55 degrees
Min Temperature is 38 degrees
Max Temperature is 75 degrees
Fill Pressure is 25-30 psi
Max pressure (relief valve) is 70psi
A lot of professionals in the industry recommend putting the expansion tank on the suction side of the pump. However, I was also told that by putting it on the discharge, it would create a cushion for the pump when the valves at the heat pumps open and close. What are your thoughts on this?
Also, where is the best place to read the pressure of the system with the frequency drive.