5.2. Demerits

Try these first

1. 1.

   What does COP stand for?

   Hint

   Think about performance measurement in cycles.

2. 2.

   Name one advantage of using air as a refrigerant.

   Hint

   It's commonly available and poses no hazard.

3. 3.

   Which factor primarily affects the efficiency of air refrigeration systems?

   • COP
   • Ambient Temperature
   • Air Pressure

   Hint

   Recall what COP measures.

4. 4.

   Air refrigeration systems can achieve very low temperatures compared to vapor-compression systems?

   • True
   • False

   Hint

   Think of temperature ranges suitable for refrigeration.

5. 5.

   Given that a certain air refrigeration cycle operates with a COP of 2.5, how much energy will it consume to provide a cooling effect of 10,000 kJ?

   Hint

   Use the formula for COP to find energy consumption.

6. 6.

   Consider an aircraft using a Bell-Coleman cycle needing to operate efficiently in a mostly quiet environment. Discuss the implications of noise generated by the system.

   Hint

   Think about passenger experience in enclosed spaces.