EcoRenovator - View Single Post - Heat Pump Water Heater

Mikesolar · 10-17-14, 05:29 PM

OK, a couple of issues. I am assuming this is a thermosyphon system so all my comments are based on this assumption.

First, thermosyphon systems work when the the fluid path is like a circle with the heat source (HX) at about 5 o'clock and the tank is between 7 and 11.

The liquid must be able rise in the HX to the top of the tank and draw the cold from the bottom of the tank. Correct me if I am wrong but you seem to have a tank with both the cold and hot at the top. This won't work (unless it is a pumped system).

Second, the HX must be placed at the bottom of the tank. If it is not, it will stop thermosyphoning when the HX temp is equal to the tank temp AT THE LEVEL OF THE HX. If it is high, it will not heat the bottom of the tank.

If it is a pumped system, you will have to have a very slow pump to equal the heat produced by the system. It is hard to control.

10-17-14, 05:29 PM	#14
Mikesolar Master EcoRenovator Join Date: Aug 2012 Location: Toronto Posts: 958 Thanks: 40 Thanked 158 Times in 150 Posts	OK, a couple of issues. I am assuming this is a thermosyphon system so all my comments are based on this assumption. First, thermosyphon systems work when the the fluid path is like a circle with the heat source (HX) at about 5 o'clock and the tank is between 7 and 11. The liquid must be able rise in the HX to the top of the tank and draw the cold from the bottom of the tank. Correct me if I am wrong but you seem to have a tank with both the cold and hot at the top. This won't work (unless it is a pumped system). Second, the HX must be placed at the bottom of the tank. If it is not, it will stop thermosyphoning when the HX temp is equal to the tank temp AT THE LEVEL OF THE HX. If it is high, it will not heat the bottom of the tank. If it is a pumped system, you will have to have a very slow pump to equal the heat produced by the system. It is hard to control.