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bobo5195 · 12-22-2005, 04:08 AM

WC systems do indeed obey the first law. What you have to consider is that the enthalpy changes in the system due to heat addition and removal are small when compared with the overall temperature variation from ambient. I.e. water maybe on average 10c above ambient due to the thermal resistance of the system and may only expel 1c of heat in the rad. As such as an engineer you could say that heat change in the system is small and that it runs at an equilibrium temp.

Punching a bit of math and you should be easily able to prove this to yourself, with the c/w and power input numbers available around here.

12-22-2005, 04:08 AM	#3
bobo5195 Cooling Savant Join Date: Aug 2005 Location: uk Posts: 400	Re: Temps in loop will reach equilibrium WC systems do indeed obey the first law. What you have to consider is that the enthalpy changes in the system due to heat addition and removal are small when compared with the overall temperature variation from ambient. I.e. water maybe on average 10c above ambient due to the thermal resistance of the system and may only expel 1c of heat in the rad. As such as an engineer you could say that heat change in the system is small and that it runs at an equilibrium temp. Punching a bit of math and you should be easily able to prove this to yourself, with the c/w and power input numbers available around here.