A = 11.9 m^2

2.38 An empirical expression that is sometimes used to estimate the base cost of a shell and tube heat exchanger is (Corripio, Chrien, and Evans 1982), Chx = exp[8.202 +0.1506 In A +0.06811(In A)?] In this equation, Chx is the heat exchanger cost in U.S. dollars, and A is the heat transfer area in square meters. Consider a shell and tube heat exchanger with a heat transfer area of 400 m2. The heat exchanger has a life of 25 years, with a sal- vage value equal to 5% of its initial cost. The annual operation and maintenance costs are anticipated to be 15% of the initial cost. The after-tax rate of return is 14.1%. The company's tax rate is 52% and SLD is used for depreciation. For this heat exchanger, the tax life is 20 years and the salvage value is $6,500. Determine the uniform annual savings resulting from this heat exchanger. 2.38 An empirical expression that is sometimes used to estimate the base cost of a shell and tube heat exchanger is (Corripio, Chrien, and Evans 1982), Chx = exp[8.202 +0.1506 In A +0.06811(In A)?] In this equation, Chx is the heat exchanger cost in U.S. dollars, and A is the heat transfer area in square meters. Consider a shell and tube heat exchanger with a heat transfer area of 400 m2. The heat exchanger has a life of 25 years, with a sal- vage value equal to 5% of its initial cost. The annual operation and maintenance costs are anticipated to be 15% of the initial cost. The after-tax rate of return is 14.1%. The company's tax rate is 52% and SLD is used for depreciation. For this heat exchanger, the tax life is 20 years and the salvage value is $6,500. Determine the uniform annual savings resulting from this heat exchanger