Messages

1

Open Loop Geothermal Heat Pump / Re: Advice for New Open Loop System

« on: July 15, 2017, 04:23:46 PM »

Very helpful. Thank you. One follow-up.

In the forum post you referenced, the original solution was to use a 2 HP pump and replaced with a 1 HP and a 3/4 HP pump.

In my situation, the well contractor recommended a 1 HP 25 gpm pump for both the house water and my single, 4 ton geothermal heat pump. Would the 2 pump solution still provide energy savings in my scenario?

2

Open Loop Geothermal Heat Pump / Advice for New Open Loop System

« on: July 13, 2017, 11:30:29 PM »

I'm getting ready to build a house in a few months and I am determined to have a "pump and dump" open loop geothermal heat pump installed. I also have to have a water well for domestic water anyway, so I'm planning to use the same well for both. I was looking at variable speed pumps, but based on the reviews on this site and others, it sounds like that would be a big mistake.

The CSVs with a pressure tank definitely seem like the way to go, but I'm concerned about the efficiency loss of the heat pump getting water from the pressure tank that would either be in the garage, or outside in a pump house. In the summer, both the garage and a pump house would be hot in the summer and cold in the winter, so drawing water from the pressure tank will be hot during the cooling season, and cold during the heating season. Won't that cause the heat pump to lose efficiency? I realize that eventually, it would be fresh, cool groundwater that's running through the system once the pressure drops enough, but the time it takes to get to that point seems like a problem to me. Is there anything I can do about this?