I have a tank of lube oil which is not insulated and top of tank is a compartment, in other words, tank is the bottom of the auxiliary compartment. The volume of tank is 25.000 liters. Because we will flush the pipes with lube oil pump (90 KW), the temperature of oil will increase by time. I assumed 50% of pump power will be converted into heat in oil and the oil will increase 4 celcius/hour. But i dont know how to calculate the heat exchange between oil in tank and ambient. Does anyone know a simple formula to calculate hourly heat exchange (Celcius/Hour) of mass oil inside a tank and ambient ?
Dear Serkan,
I presented in the attached file a simple solution to your question.
Good luck.
Dear Hakim,
This calculation shows the heat exchange between pump and oil. You also found same result as i wrote in my question as 4 celcius degree per hour.
Imagine ambient is 35 degree. The temperature of oil will increase 20 degree after 5 hours due to pump and it will become 55 degree. But the tank itself is exposed to air (ambient) and there will be heat exchange between air and tank. It depends on surface of tank and thickness of tank sheet as i read but i could not find a simple formula for this.
In short i wanna learn this actually. If the oil in a tank is 50 degree and the ambient temperature is 35 degree, what will be the hourly heat exchange between ambient and oil?
Dear Serkan,
I presented in the attached file a new solution to your question.
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Dear Hakim, thanks for your answer. I used your first formula and one another and found attached result. There will be 1 degree/hour increase in oil when the oil reaches 75 degree temperature according to that calculation. I hope it is true.
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