I want to make an electrical resistance for heating the oil.
A flat device (1.2" thick x L: 63" W: 39") located at low height in the oil bath.
The estimated power is 200W with 12V power.
The maximum operating temperature is 100C, I hope to warm up the oil in a few seconds (30 ... 60) - for the battery protection I just will not use 2 batteries: one summer (12V / 50Ah) and one winter (12V / 75Ah) ...
Now I'm thinking about the possibility of optimal heat transfer.
Classical heating resistors have a yield of 0.75 (that is, 200W is transported in oil than 150W).
If the heater is outside the oil bath,that is, you heat the steel that heats the oil - between the resistance and the steel wall the thermal contact is faulty but the contact between the steel and the oil is ok.
However, only one heater part is in contact with the oil bath .
On the other hand, the ultra-flat device, located in the oil sump, which is covered in oil , the transfer is maximum.
So I see the problem and I'm sure there are other issues.
Any opinion is welcome.
A flat device (1.2" thick x L: 63" W: 39") located at low height in the oil bath.
The estimated power is 200W with 12V power.
The maximum operating temperature is 100C, I hope to warm up the oil in a few seconds (30 ... 60) - for the battery protection I just will not use 2 batteries: one summer (12V / 50Ah) and one winter (12V / 75Ah) ...
Now I'm thinking about the possibility of optimal heat transfer.
Classical heating resistors have a yield of 0.75 (that is, 200W is transported in oil than 150W).
If the heater is outside the oil bath,that is, you heat the steel that heats the oil - between the resistance and the steel wall the thermal contact is faulty but the contact between the steel and the oil is ok.
However, only one heater part is in contact with the oil bath .
On the other hand, the ultra-flat device, located in the oil sump, which is covered in oil , the transfer is maximum.
So I see the problem and I'm sure there are other issues.
Any opinion is welcome.
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