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CostEstimationOfAHeat

Exchanger

Group Members

Chinthaka Perera

Chris Peng

Sandy Lee

Terry Peters540:343 Engineering Economics Spring 1998

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Outline

Introduction and Problem Definition

Designs of Heat Exchangers

Base Cost Estimation

Complete Cost Estimation

Conclusions & Recommendation Questions

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Problem Definition

Heat cold water from 15o

C to 85o

Cusing the minimum resources

Area Limited to 50 square meters

Minimize the cost of operation and

maintenance of the machine

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Efficiency: 48%

Power: 7.317x10 5Watts

Length of Pass: 4.7 meters, Life Cycle 5 yr.

540:343 Engineering Economics Spring 1998

Shell And Tube Heat Exchanger

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Counter Flow Heat Exchanger

Efficiency: 48%

Power: 7.317 x 105Watts

Length 129.55 meters, 8 revolutions, Life Cycle: 5yr.

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Cross Flow Heat Exchanger

Efficiency: 61%

Power:2.92 x 105Watts

Area: 28.4 square meters, Tubes: 7898, Life Cycle 25 yr.

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Summary of Designs

Power

(Watts)

Life

Cycle

Efficiency

Shell &

Tube

7.137 E5 5 yrs 48 %

Counter

Flow

7.137 E5 5 yrs 48 %

Cross

Flow

2.92 E5 25 yrs 61 %

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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)

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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 Exchanger540:343 Engineering Economics Spring 1998

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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)

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Complete Cost Estimation

Base Cost of Cross Flow Heat Exchanger - $ 2200

Operation and Maintenance Cost + Cost of Gas - $ 2300

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Total Cost Over Life Cycle - $ 4500

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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 heatwater.

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Recommendation : Cross F low Heat Exchanger

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Questions ??

Design of Heat Exchanger??

Base Cost Estimating Technique??

Complete Cost Estimation??

Choice of Heat exchanger ??

540:343 Engineering Economics Spring 1998