CLAIRE DUFFIE
Mechanical Engineer
HEATED TESTING VESSEL FOR ACID
Lyndra Therapeutics
DESIGN PROCESS
![JarProblemStatement.PNG](https://static.wixstatic.com/media/a78115_956be1e51df44f03813a829d3c22941b~mv2.png/v1/fill/w_460,h_584,al_c,q_85,enc_auto/JarProblemStatement_PNG.png)
PROBLEM STATEMENT
Samples are subjected to repeated stress while incubated in FaSSGF. A heating system is required to keep the FaSSGF at body temperature through the test
SYSTEM REQUIREMENTS:
• Holds the element that stresses samples
• Maintains temperature to ±1°C
• Doesn’t degrade in acid
• Same height as existing jar
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IDEA GENERATION:
Three possible designs shown below range from least invasive to most invasive design solution.
![Idea Generation.PNG](https://static.wixstatic.com/media/a78115_9ea912c97652413783fdbb1aa663675f~mv2.png/v1/fill/w_980,h_625,al_c,q_90,usm_0.66_1.00_0.01,enc_auto/a78115_9ea912c97652413783fdbb1aa663675f~mv2.png)
INITIAL PROTOTYPES
THERMAL FIN (left): Too much heat is lost to the environment since size constraints limit the thermal mass – method rejected
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BASE HEATING (right):
• Water heated up
• Thermocouple accurately reads water temperature
• Insulated base got hot over time
![Prototype 1.PNG](https://static.wixstatic.com/media/a78115_b799b3d097b544fa94ccdac9f866c33d~mv2.png/v1/fill/w_490,h_271,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/a78115_b799b3d097b544fa94ccdac9f866c33d~mv2.png)
![Prototype 1.PNG](https://static.wixstatic.com/media/a78115_5bfc0de48b7a4c9f87a5cc86534af370~mv2.png/v1/fill/w_490,h_363,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/a78115_5bfc0de48b7a4c9f87a5cc86534af370~mv2.png)
PROTOTYPE 2
ADJUSTMENTS:
• Increased insulating air gap in base between heater and bottom surface
• Gasket added between jar and conductor
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RESULTS: Water reached temperature in about 45 minutes and maintained ±0.5°C (shown in graph)
![FinalJar_edited_edited.jpg](https://static.wixstatic.com/media/a78115_16cd8d082eb441d1aeb94e10f2e96d8e~mv2.jpg/v1/fill/w_980,h_512,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/a78115_16cd8d082eb441d1aeb94e10f2e96d8e~mv2.jpg)
MACHINED AND ASSEMBLED FINAL HEATED JAR
ADJUSTMENTS:
• Thermocouple screws directly into side wall
• Screen added to support to collect broken samples
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RESULTS:
• Reduced user time by 5 minutes/cycle
• Maintained temperature to improve accuracy of test
• Standardized system to decrease user error