-Pressure loss along the road in the cold channel (∆ p): pressure loss along the road in the cold channel is defined as follows: + ∆ p = Pvào + Pvào, Pra-Pra: pressure on and the pressure out of the cooling system. -Cold channel diameter d: calculating diameter of cold channel is very important. Cooling system has to work effectively or not depends very much on cold channel diameter. From the formula above, rewritten as follows:
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