Introduction to Refrigeration Systems : Examples of Refrigeration

 Key Points:

1. Commercial Refrigeration Applications:

   • Walk-in Refrigerators/Freezers:
     • Focus: Food preservation, not comfort cooling.
     • High demand for skilled technicians.
     • Evaporators with constant running fans for temperature maintenance and coil defrosting.
     • Condensing units typically on the roof or atop the cooler/freezer.

2. Refrigerated Warehouses:

   • Use of multiple systems for redundancy.
   • Ensures product preservation even if some units fail.
   • Condensing units often placed lower than evaporators to aid oil return to compressors.

3. Commercial Coolers/Freezers:

   • Common in restaurants.
   • Often require significant maintenance and repair due to lack of regular upkeep.

4. Supermarket Refrigeration:

   • Dairy Cases: Reliability is crucial to minimize product loss.
   • Rack Systems: Mechanical rooms loaded with piping, controls, and compressors.
   • High complexity and significant work involved in maintaining such systems.

5. Equipment Rooms and Safety Codes:

   • Construction: Safety considerations for refrigerant and oxygen alarms.
   • Alarms: Audible/visible alerts for refrigerant leaks and low oxygen levels.
   • Building Automation Systems: Alerts for off-site personnel.
   • Ventilation: Isolated duct systems to prevent contamination.
   • Emergency Controls: Located outside the room; sometimes equipped with scuba gear for safe entry in case of leaks.