Correct Answer - Option 3 : low weight per ton
Explanation:
A gas refrigeration cycle is used in aircraft refrigeration system and the cycle is also called air refrigeration cycle.
The air cycle is favorale for aircraft refrigeration system because:
- Aircrafts have high cooling loads because of large occupancy, electronic equipment and high velocity and consequently high heat generation due to skin friction.
- The power per tonne of refrigeration is higher than VCRS system.
- The weight per tonne of refrigeration is low due to low density of air and space and volume required is less.
- Small amount of leakage are tolerable with air as the refrigerant.
- Avialibilty of the refrigerant in mid air.
- Cabin pressurization and airconditioning can be combined into one operation.
In aircraft weight is the primary concern. So for aircrafts a refrigeration system which can provide more cooling with low weight is required. That’s why in aircraft the gas refrigeration systems are employed.