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Q: Ethylene glycol flows at 0.0 I kg/s through a 3-mm-diameter, thin-walled tube. The tube is coiled and sub-merged in a well-stirred water bath maintained at 25°C. If the fluid enters the tube at 85°C, what heat rate and tube length are required for the fluid to leave at 35°C? Neglect heat transfer enhancement associated with the coiling.