Part III - Outline

6. Vacuum & Insulation

7. Measurement & Testing

8. Properties of Materials & Fluids

9. Conclusion & Resources

Part III - Questions:

1. What happens to the vacuum level in a warm VJ pipeline when after cooldown is performed?
2. Why is thermal insulation important to a glass of water in a blast furnace?
3. What are the four key things needed to produce a good vacuum system? (answer: design/seals, fabrication methods, cleaning, bake-out)
4. What is a “good” vacuum?
5. What three kinds of temperature sensors are commonly used in cryogenics?
6. What are the two main problems with measuring low temperatures?
7. Explain enthalpy and entropy and give examples of how that makes you feel?
8. What are the two needs that are met by thermal insulation systems?
9. Name a typical insulation system for a vacuum and a non-vacuum (ambient pressure) insulation system. What is the typical k-value range for each insulation system?
10. Measures of thermal performance can include k-value, heat flux, and heat leak. For each measure, which is better, a lower or higher number?
11. What is a source of data on thermophysical properties and materials properties?