Cost Estimation Of A Heat Exchanger Group Members

Cost Estimation Of A Heat Exchanger Group Members Chinthaka Perera Chris Peng Sandy Lee Terry Peters 540: 343 Engineering Economics Spring 1998

Outline • • • Introduction and Problem Definition Designs of Heat Exchangers Base Cost Estimation Complete Cost Estimation Conclusions & Recommendation Questions 540: 343 Engineering Economics Spring 1998

Problem Definition • Heat cold water from 15 o. C to 85 o. C using the minimum resources • Area Limited to 50 square meters • Minimize the cost of operation and maintenance of the machine 540: 343 Engineering Economics Spring 1998

Shell And Tube Heat Exchanger Efficiency: 48% Power: 7. 317 x 10 5 Watts Length of Pass: 4. 7 meters, Life Cycle 5 yr. 540: 343 Engineering Economics Spring 1998

Counter Flow Heat Exchanger Efficiency: 48% Power: 7. 317 x 105 Watts Length 129. 55 meters, 8 revolutions, Life Cycle: 5 yr. 540: 343 Engineering Economics Spring 1998

Cross Flow Heat Exchanger Efficiency: 61% Power: 2. 92 x 105 Watts Area: 28. 4 square meters, Tubes: 7898, Life Cycle 25 yr. 540: 343 Engineering Economics Spring 1998

Summary of Designs 540: 343 Engineering Economics Spring 1998

Base Cost Estimating Technique Base Cost = Cost of Materials to Construct Heat Exchanger + Cost Of Installation of Heat Exchanger Conversion of Base Cost to Annual Worth using MARR = 10% AWHeat Exchanger = (Base Cost) x (A/P, 10%, Life Cycle) 540: 343 Engineering Economics Spring 1998

Base Cost Estimation Of Heat Exchanger Designs Using Annual Worth and assuming repeatability AWShell and Tube = - $ 14400 AWCounter flow = - $ 63400 AWCross flow = - $2200 Best Alternative for Heat Exchanger is Cross Flow Heat Exchanger 540: 343 Engineering Economics Spring 1998

Complete Cost Estimating Technique Complete Cost = Base Cost + Operation and Maintenance Conversion of Complete Cost to Annual Worth using MARR = 10% AWHeat Exchanger = (Base Cost) x (A/P, 10%, Life Cycle) + (O & M) x (A/P, 10%, Life Cycle) 540: 343 Engineering Economics Spring 1998

Complete Cost Estimation • Base Cost of Cross Flow Heat Exchanger - $ 2200 • Operation and Maintenance Cost + Cost of Gas - $ 2300 Total Cost Over Life Cycle - $ 4500 540: 343 Engineering Economics Spring 1998

Conclusions & Recommendation • Cross Flow Heat Exchanger is the most effective for the purpose • Cross Flow Heat Exchanger is the most Cost Effective Aside: The Shell & Tube and Counter flow reused waste to heat water. Recommendation : Cross Flow Heat Exchanger 540: 343 Engineering Economics Spring 1998

Questions ? ? Design of Heat Exchanger…? ? Base Cost Estimating Technique…? ? Complete Cost Estimation…? ? Choice of Heat exchanger …? ? 540: 343 Engineering Economics Spring 1998