- Apr 14, 2002
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If you're even considering using a peltier to utilize the cold you can get from it, you need to harness as much as possible and the wire idea will take way too long to reach a useable cold, IMO. Using a water block to collect the cold from the peltier is a very good cold transfer to the water or coolant, using the same chilled water to actually cool the CPU in the same loop. Even though the water block may not be the most efficient use of the peltiers cold collection, it will be far more efficient than using wire for cold transfer, water flowing inside the tubing transferring cold vs solid wire transferring cold? It's kinda a no brainer as to which will yield the best useable results, if you really think about it.
If you take the operation of the traditional radiator water cooling, vs, the active chilled water cooling explained in this thread as a direct example of peltier use.
When a traditional radiator loop is powered up after a time period of being off, the coolant temperature in the loop equalizes to ambient room temperature.
Once powered the coolant starts to flow collecting the CPUs heat and the coolant temperature begins to rise and continues to rise until it reaches a temperature point of equilibrium, above ambient room temperature.
When the chilled water system is powered after a period of being off, it's coolant temperature has also returned to ambient room temperature, the coolant starts to flow collecting the CPUs heat, but unlike the radiator the peltier assemblies are outputting cold, so the chilled water cooling never ever goes above ambient, but steadily drops below ambient until it's cold equilibrium is reached, which normally takes about 30 minutes of operation and which is usually around 15c below ambient room temperature.
Now if you use solid copper wire to transfer the cold to the reservoir, even if you insulate all the wire and reservoir the cold transfer will take much longer to occur and be also IMO be limited, which will allow the CPU to have dumped a significant amount of heat that the impeded cold transfer cannot recover.
Keep in mind the water flowing is constantly transferring heat, (from the CPU) ~ to the coolant ~ cold to the coolant (from the peltier assemblies) ~ cold stored inside the insulated reservoir, ~ pumped back to the CPU to collect it's outputted heat, and the cycle continues.
I would think if you intended to expend the electrical power to run the peltiers in the first place, you would want as much from them as possible.
If you take the operation of the traditional radiator water cooling, vs, the active chilled water cooling explained in this thread as a direct example of peltier use.
When a traditional radiator loop is powered up after a time period of being off, the coolant temperature in the loop equalizes to ambient room temperature.
Once powered the coolant starts to flow collecting the CPUs heat and the coolant temperature begins to rise and continues to rise until it reaches a temperature point of equilibrium, above ambient room temperature.
When the chilled water system is powered after a period of being off, it's coolant temperature has also returned to ambient room temperature, the coolant starts to flow collecting the CPUs heat, but unlike the radiator the peltier assemblies are outputting cold, so the chilled water cooling never ever goes above ambient, but steadily drops below ambient until it's cold equilibrium is reached, which normally takes about 30 minutes of operation and which is usually around 15c below ambient room temperature.
Now if you use solid copper wire to transfer the cold to the reservoir, even if you insulate all the wire and reservoir the cold transfer will take much longer to occur and be also IMO be limited, which will allow the CPU to have dumped a significant amount of heat that the impeded cold transfer cannot recover.
Keep in mind the water flowing is constantly transferring heat, (from the CPU) ~ to the coolant ~ cold to the coolant (from the peltier assemblies) ~ cold stored inside the insulated reservoir, ~ pumped back to the CPU to collect it's outputted heat, and the cycle continues.
I would think if you intended to expend the electrical power to run the peltiers in the first place, you would want as much from them as possible.
while I wait.
)
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