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2. Water flows inside of a copper pipe with an ID of 2.5 cm, the wall thickness is 2mm. The convection coefficient on the inside is estimated of 500, while the outside convection coefficient is 20.1) Determine the U based on inner side area. 2) If an insulation layer (is mounted outside the pipe with a thickness of 1 cm. Recalculate U at the same side. Assume the overall temperature difference of the system is 200 (225 to 25 C). 3. Refrigerant flows into a 1.9" O.D. copper tube with 0.281" wall thickness. The pipe inner surface temperature is 5 F and the room temperature is 70 F. Force convection may occur outside the pipe that increase the refrigerant flow temperature (assume). To avoid this, an engineer plans to add an insulation layer ) that can reduce 25% heat transfer from ambient. Find the thickness of insulation material. Neglect thermal radiation. Thermal resistance with a very little value may be also neglected. (Advance math tool is allowed, e.g., Wolfram Alpha)