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Complex Thermo-Dynamic System of Equations

  1. Jun 3, 2010 #1
    I took AP Physics (failed) back in high-school, and I've retained most of the information, but we didn't delve too far into thermo-dynamics, instead focusing mostly on resistance, acceleration, velocity, friction, ect...

    I am trying to calculate a few things to determine the average temperature of a liquid in a system after the system is in motion....

    What I'm doing is trying to calculate and work this system out before I build it. I'm going to water-cool my PC. I am going to put the reservoir inside of a mini-fridge, and the radiator(s) in front of an Air Conditioning unit. Everything connected together by tubes to create a closed system loop.

    [PLAIN]http://www.zombiefire.com/ocn/crazyidea.png [Broken]

    Since I'm not that knowledgable about thermodynamics I did a bit of research before I started and began to determine my variables.

    1) BTU of mini-fridge
    2) Heat Given off by CPU
    3) BTU of A/C unit.
    4) Initial temperature of water
    5) Rate of dissipation of heat from a Radiator. (cooled by A/C). Obviously you won't have 100% efficiency and have all 5000 BTU of the A/C into the Radiator....
    6) Amount of liquid in the loop. (resevoir + tubing + Radiator)
    7) Ambient air temperature. (outside the system)
    8) Speed of fluid pumped through system (effecting heat absorption)
    9) Friction of fluid through system (increasing heat)
    10) Thermal capacity of water.

    I'm not sure if I've forgotten any variables....

    I then tried to teach myself some basic thermo-dynamics and get some of the variables from around the internet:
    Now for this system to work correctly, the temp. of the fluid in the system has to be at or below a certain temperature (the Fridge isn't made to be on 100% of the time, but instead is meant to cycle on and off. I don't want to burn out the fridge).

    I'm not really sure where to go from here. If anyone could get me started, give me some pointers and point me towards the right direction?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jun 4, 2010 #2
    Ha=(Hw)-(Hcpu)+(Er * Ha)+(Hf)

    Ha=Average Heat
    Hw=Heat of Water (initial)
    Hcpu=Heat of CPU/hr
    Er=Heat of AC>Radiator system
    Ha=Heat of AC/hr
    Hf=Heat of Fridge/hr

  4. Jun 4, 2010 #3
    Is there no-one here who can help me?
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