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To address your query accurately, it’s important to understand that the context of “reduction in the total friction loss with hydrogen cooling” likely pertains to the cooling of electrical machines, such as large generators and electric motors. Hydrogen, due to its superior cooling properties compared to air, is often used to cool large electrical machines to increase their efficiency and power output.
The reduction in total friction loss due to hydrogen cooling is primarily associated with its higher thermal conductivity and lower density compared to air. Hydrogen’s thermal conductivity is approximately 7 times greater than that of air, which allows for more efficient heat removal from hot surfaces. Additionally, because hydrogen has a lower density than air, the drag or friction on rotating parts within the generator or motor (such as the rotor) is reduced. This decrease in drag directly translates to a reduction in friction losses.
While exact figures for the reduction in total friction loss will depend on specific machine designs and operating conditions, the key point is that hydrogen cooling can significantly reduce frictional losses compared to air cooling. This is due to the reduced mechanical drag and improved heat transfer characteristics of hydrogen. The reduction in friction losses contributes to the overall improvement in the efficiency of the electrical machine.
For precise calculations or more detailed explanations specific to a particular system or context, reviewing technical documentation or conducting simulations based on the operational parameters of the machine would be necessary.