How am I getting cold damage?

[Stretchytall]

I created a Thermo Aquatuner cooling loop in order to cool 140 degree fahrenheit water from a saltwater geyser to go to my main fresh water holding tank. I want the water to be cooled below 80 degrees fahrenheit before going to the tank. That requires multiple passes through the AT. I set up a Pipe Temp Sensor with two liquid valves to determine when a packet of water is below 80 degrees. If it is, the valve to the holding tank opens. If not, the AT return valve opens so the water packet makes another pass through the cooling loop.

The problem is that the piece of pipe right outside the AT output keeps getting cold damage. How is this possible? The packets that get sent back to the AT are never under 80 degrees, and they merge with partial packets of water that are 140 degrees. A pass through the AT only reduces temperature by 25.2 degrees fahrenheit. So how is water getting cooled down to freezing point at 32 degrees fahrenheit and causing cold damage?

[The Tempted Man]

It's the same with metal refinery. that one piece of the pipe you won't ever see because its under the green box, also was getting damaged for me. I had to lower the temperature even more, to make it stop, not even pipes out of insulation helped prior to that. So you need a higher temperature water.

[Bokonon]

Screenshots? You need to be careful where you put your sensor and how you bypass the AT. I recommend this video posted yesterday, it's not the exact same situation you want but should be adaptable to your needs.

https://www.youtube.com/watch?v=SKYa3wHO6_8

[Stretchytall]

Originally posted by Bokonon:

Screenshots? You need to be careful where you put your sensor and how you bypass the AT. I recommend this video posted yesterday, it's not the exact same situation you want but should be adaptable to your needs.

https://www.youtube.com/watch?v=SKYa3wHO6_8

I've google searched how to put a screenshot in these forums, and I still haven't found the answer! Copy and past doesn't work. How's it done?

[Bokonon]

Originally posted by Stretchytall:

Originally posted by Bokonon:

Screenshots? You need to be careful where you put your sensor and how you bypass the AT. I recommend this video posted yesterday, it's not the exact same situation you want but should be adaptable to your needs.

https://www.youtube.com/watch?v=SKYa3wHO6_8

I've google searched how to put a screenshot in these forums, and I still haven't found the answer! Copy and past doesn't work. How's it done?

It's a YT link, they automatically show like that.

I don't know how other do it, I hope there's a better way coz it's a pain but I use F12 with Steam to take the screenshot, then you have to upload it with Steam's upload tool, then I go to it in my "Content" click it, it'll open in a sub window, click the URL here it will open another window, from this last window I copy the URL and paste it into a comment, then it shows like you want. Again I hope someone can show me a faster way ...

[Stretchytall]

https://steamcommunity.com/sharedfiles/filedetails/?id=1857024188

https://steamcommunity.com/sharedfiles/filedetails/?id=1857024249

[Stretchytall]

Awesome! Thanks for teaching me that!

In this screenshot, I've opened the chamber to make repairs. I'm going to install a thermo bypass like I use with my steam turbines/aquatuner setups. It works well to prevent the water from overcooling. Should work well here.

[Stretchytall]

https://steamcommunity.com/sharedfiles/filedetails/?id=1857027450

https://steamcommunity.com/sharedfiles/filedetails/?id=1857027496

[Stretchytall]

The thermo sensor shuts down the aquatuner, causing the cool water to bypass it.

[Stretchytall]

I figured it all out! When I made my first design, the two water valves were immediately adjacent to the pipe thermo sensor. However, when the thermo sensor detects a significant change in the tempterature of the water in the pipe, it takes one second for the change in the automation system to use the valves to change which output pipe is open.

So even though the sensor detected cool water, the cool water would go through the wrong pipe just before the valve closed. This is what allowed water packets that were too cold to go back to the aquatuner, resulting in the damaged pipe.

The solution is to move the pipe thermo sensor one tile upflow; in other words, one tile away from the liquid valves. This allows the needed time to change which valve is open and perfectly separate the hot water from the cool.

[Defektiv]

You can also drop a layer of crude oil underneath the water. It will regulate heat and cold so that the AT doesn't fry the pipes and will still evaporate the water on top into steam. The oil will never evaporate so it stays at 125C along with the AT while the water circulates into steam and back again.

[fractalgem]

I give my sensors margin room, so they stop the aquatuners something like 2-3 degrees before it'd be too cold.