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Conductive Heat Transfer Apparatus

Conductive Heat Transfer Apparatus . P13624. Group Members. John Durfee , Ryan Murphy, Fielding Confer Dan Unger, Katie Higgins, Robin Basalla. Roles . Customers and Sponsor. Karuna Koppula and Paul Gregorius RIT Chemical Engineering. Agenda . Project Description.

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Conductive Heat Transfer Apparatus

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  1. Conductive Heat Transfer Apparatus P13624

  2. Group Members John Durfee, Ryan Murphy, Fielding Confer Dan Unger, Katie Higgins, Robin Basalla

  3. Roles

  4. Customersand Sponsor KarunaKoppula and Paul Gregorius RIT Chemical Engineering

  5. Agenda

  6. Project Description

  7. Top Level Function Uninformed Student Informed Student Demonstrate Principle of Thermal Conductivity Hands-on Experience Partial Assembly Energy Thermal Energy Unknown k Known k

  8. Functional Decomposition

  9. Project Plan II Review and Planning Order Parts Software Development Document Templates Construction and Testing Final Assembly and Testing Documentation and Presentation

  10. Concept Summary

  11. Subsystems and Ideas

  12. Combined Concept

  13. Design Summary

  14. Design as of MSD I • Cartridge heater • Drilled into Specimen • Cooling water jacket • Boxed housing • Thermocouples • Drilled into Specimen • Cylindrical Specimen • Rigid, molded insulation • Seated closure

  15. Cross Sections Hot Side Cold Side

  16. Bill of Materials

  17. Bill of Materials (continued)

  18. Issues in MSD II The following issues will be explained further: • Cold Side support addition • Shipping time of heaters and thermocouples • Received a damaged sheet of insulation

  19. Shipping Time • Most materials had a reasonable lead time • Cartridge heaters were backordered by supplier • Thermocouples and heaters both took over a month to receive • Both pieces were critical to testing • Lead time disrupted original process plan

  20. Insulation • Insulation came damaged from supplier • Time was used to ship it back • There was the possibility of it happening again • Modifications were made to the design to avoid using the same sheet of insulation

  21. System Architecture

  22. Major Changes from MSD I • Whole length insulation has been replaced by a protected air pocket • Two hard points at either end provide support to the specimen • Insulation is no longer used as a lip to seal the apparatus • The outer housing has been connected through a hinge to allow for easier assembly • Material changes • Structured mineral wool insulation • High temperature Silicone fabric • Smaller scale calcium silicate

  23. Current Revision

  24. Financial Status • Current Expenditures: $905.53 • Projected Expense: $947.69 • Savings: $42.16 • Below ideal budget: $1000

  25. LabView Interface

  26. Additional Programming • A Microsoft Excel file will be provided to the lab students • It prompts them for all known parameters • Final Temperatures • LabView Data • Material • The file will automatically display graphsand values helpful to the understanding of heat conduction

  27. System Testing Results

  28. Thermocouples • Purpose:To test the accuracy and precision of the thermocouple measurements. • Procedure:Each thermocouple was placed in a beaker of boiling water at 100°C. Temperature was recorded ten times with each thermocouple. • Results:The average and standard deviation were calculated and compared to expected values

  29. Heat Source • Purpose:To determine the rate at which the cartridge heater will be receiving power. The results will provide insight on the heating power, Qin. • Procedure:The cartridge heater was attached to the power supply and changed periodically • Results:The power output versus voltage dial setting was fit to a curve

  30. Housing and Insulation • Insulation tested simultaneously with apparatus • Design modifications made previous plan obsolete • Constraints made direct assembly and testing necessary • The same testing applies to the Housing • The cartridge heater cannot exceed 120 V • The highest voltage tested was 110 V • No thermal hazards were experienced

  31. Cold Side • The Cold Side works effectively at removing necessary heat values • It is operational at temperatures down to 10 ºC • Teflon tape can be used to prevent leaking from the assembled cooling jacket

  32. Final Test Values • The observed steady state times are different for each material • This does not agree with the preliminary calculations projecting 20 minutes maximum • However, temperature gradients can safely reach above 100 ºC

  33. Project Evaluation

  34. Success • Safe • Robust • Simple • Precise • Reliable components • High temperature gradients

  35. Failure • Cumbersome • Not a flexible design • Lengthy steady state times • Accuracy off by a factor • Dependent on the material • Current precision can allow for future correction • Prototyping would have been highly beneficial

  36. Project Plan Reassessment

  37. Future Projections

  38. Future Work • Further testing can be done to better understand the instrumental error • Downsizing the design would allow for faster testing • An additional cooling jacket and/or quick release tubing would make it easier to handle specimens • An appropriate container to dispose of hot specimens, make exchanges easier and safer • Modify certain components to allow more flexibility

  39. Questions?

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