Lesson 9 - Refrigeration Technology SAQ
This lesson allows you to test yourself on the material covered in the Refrigeration Technology lesson and determine the level to which you have met the learning outcomes.
Self-Assessment Questions
1. * Explain the difference between the following:
a) Primary and secondary refrigerants
b) Ozone depletion potential and global warming potential
c) Natural and synthetic refrigerants
d) Flooded and direct expansion evaporators
2. * What are important factors to consider when selecting a primary refrigerant?
3. ** Your manager wants you to replace your brewery’s ammonia refrigeration plant with another less toxic gas. What would your arguments be for keeping the ammonia plant?
4. **
a) What are the advantages and disadvantages of screw and reciprocating compressors?
b) How would you decide which compressor to use in your processes?
5. **
a) What are the advantages and disadvantages of wet and dry condensers?
b) If wet condensers deliver higher efficiencies why would you consider using dry condensers?
6. **
a) Discuss the following statement: It is essential to have a secondary refrigerant circuit when using ammonia as a primary refrigerant.
b) How would you reduce the amount of ammonia used?