Hi, I am putting together a solar water heating system in Spain (using the trial and error/hit & miss system). I have a very nice flat panel, which is approximately 1.25m x1.25m. Mounted on a steel structure over my parking area, pointed due South and angled at approximately 45 deg. I want to use an indirect heating system and have purchased a second hand steel tank and made a copper coil to go inside it. There is some corrosion in the tank which I will clean out with a wire brush on a flexible from my drill. The questions I would like some help with are:
1) Having cleaned out the tank, what type of paint should I use to protect the inside of the tank?
2) If I add glycol to the water in the tank will it help to reduce the possibility of corrosion?
The tank is 300 litres capacity. The contents of the tank will circulate through the panel using a 12v DC pump. The coil is approximately 3 meters of 9mm OD copper tube. I want to run the water that I use in the house through the coil and hope that it will pick up enough heat in the tank to provide hot water for showers etc. The design of this coil is where the trial and error comes in. There must be is a calculation that would give an approximate surface area, but have no idea what it is. Any help gratefully appreciated.
1) Having cleaned out the tank, what type of paint should I use to protect the inside of the tank?
2) If I add glycol to the water in the tank will it help to reduce the possibility of corrosion?
The tank is 300 litres capacity. The contents of the tank will circulate through the panel using a 12v DC pump. The coil is approximately 3 meters of 9mm OD copper tube. I want to run the water that I use in the house through the coil and hope that it will pick up enough heat in the tank to provide hot water for showers etc. The design of this coil is where the trial and error comes in. There must be is a calculation that would give an approximate surface area, but have no idea what it is. Any help gratefully appreciated.
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