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- TL;DR Summary
- Given a tank of known volume and knowing the temperatures of water as it enters, remains, and leaves the tank, is it possible to calculate heat gained or lost?

I have a solar water heater on my deck, with a circulator powered by PV, that pumps heated glycol through a wand heat exchanger placed in an 80 gallon tank. Water comes from the well's pressure tank, passes through this solar pre-heater tank, then into an LPG heater that adds any heat needed. I want to calculate, in my home automation software, the amount of heat in B.T.U's that are produced in the water flowing through this system. I can measure:

1. The temperature of the water as it enters and exits the system, and in the tank. As well, the temperature of the heat exchanger.

2. The flow of water through the system, which is of course intermittent.

if I can make this calculation periodically, then the software can total it. any guidance would be appreciated.

1. The temperature of the water as it enters and exits the system, and in the tank. As well, the temperature of the heat exchanger.

2. The flow of water through the system, which is of course intermittent.

if I can make this calculation periodically, then the software can total it. any guidance would be appreciated.