Problem 4; 45 points) A one-inch outer diameter steel pipe (k = 24 Btu/hr-ft-F) has its outside wall surface maintained at 300F. It is proposed to increase the rate of heat transfer by adding longitudinal fins of 3/32-inch thickness and 7/8 inch length to the outside pipe surface. Compare the increase in heat transfer achieved by adding eight longitudinal straight fins or circular fins with the same total surface area as the eight longitudinal fins (for the circular fins, take the outer diameter to be 2.75", with a thickness of 3/32"). The surrounding air is 70F, and the convective heat transfer coefficient is 6 Btu/hr-ftF. Problem 4; 45 points) A one-inch outer diameter steel pipe (k = 24 Btu/hr-ft-F) has its outside wall surface maintained at 300F. It is proposed to increase the rate of heat transfer by adding longitudinal fins of 3/32-inch thickness and 7/8 inch length to the outside pipe surface. Compare the increase in heat transfer achieved by adding eight longitudinal straight fins or circular fins with the same total surface area as the eight longitudinal fins (for the circular fins, take the outer diameter to be 2.75", with a thickness of 3/32"). The surrounding air is 70F, and the convective heat transfer coefficient is 6 Btu/hr-ftF