So I'm working on a project that involves a dual liquid cooling system. The system is designed to be fitted into a hard case backpack that the user can carry around. The system includes a dual liquid cooling system, an on board 64-bit computer, a 12 Volt DC 28 AH AGM power supply with power regulation, and an Arduino to control several systems. This post is about the liquid cooling system and the Arduino's control over it.
The system has:
-Two liquid cooling loops
-Two pumps (PWM)
-Four 120mm radiator fans (PWM)
-A Peltier thermal unit (30 watts)
-A computer CPU
The diagram attached shows a visual representation of the system.
The upper side of the Peltier unit is the cold side, while the bottom side is the hot side.
The point where loop 1 goes off to "Human Body" is the loop running through a wearable vest that the user can wear.
I know I can use a MOSFET to control the Peltier unit as well as the pumps and fans. Using PWM's, I will control the speed of the pumps and fans. The Arduino will receive temperature readings from sensors in both loops 1 and 2, and control the fans and pumps to adjust the loop 1 temperature to the desire of the user. Master power supply will come from a 12 volt AGM battery.
What are your opinions on this setup and could you guys, with your wisdom, offer any advice on this system? Do you think it will work? Any possible difficulties? Thank you for the help and assistance.
Hi, how much power will this apparatus consume and what battery capacity can you carry around, how much mass is involved.
To answer jremington, it sounds like the user will be in a coolsuit, like racing drivers use.
I would be doing a mass audit of everything that is needed to see if it can be carried safely by anybody.
MSOS, M doesn't stand for Mars does it?
The section where loop 1 goes off to "human body" is where it runs through a wearable vest with 1/4" ID tubing interlaced within it. Just like TomGeorge said, it is a cooling vest. This one has quick disconnects and uses a liquid coolant, rather than the vests you submerge in water then wear.
The power source will be a 12 Volt DC 28 Amp Hour AGM battery roughly 6" x 6" x 5.5".
It's sealed to prevent leaks and AGM so there is no gas buildup, eliminating unnecessary hazard to the user.
There is an error with the diagram, it should be a 29.3 Watt Peltier unit rather than 60 watts. I'll make the necessary changes to the original post.
I'm looking to optimize the system to run at no more than 60 watt consumption. Given that the power source is 28 AH, that should allow 5.6 hours of run-time at full capacity (60 watts).
Finally, if you mean mass as in size and how much space it takes up, the pack should be about the size of your typical college backpack. If you mean mass as in weight, I'm looking at 30-40 LBS. That shouldn't be an issue however as the system will be mounted on an exoskeleton.
PS: Please send a spaceship with food and water to mars ASAP. I'm stuck here!
Hi, your available energy from the battery is governed among other things on discharge rate.
You need to consult the battery specs to see what run time you will get out of the battery at 5A discharge current.
This is the battery I plan on using within this project. I've contacted customer support with a request for further technical details but they haven't gotten back to me yet. 5.6 hours is a best case scenario mathematical prediction, there are variables to consider involved with power loss and discharge. I do believe you can discharge 5 amps constant from the battery without any issues, but I know there is resistance involved and a small percentage of power loss with the power regulators doing their tasks. With all of this in mind, the battery is rated for 30AH, but the project specs and design treat the battery as if it's only 28AH. A little leg room ;D
