Refrigeration appliances are an integral part of modern day kitchens - Leaving Cert Home Economics - Question 4 - 2007

The working principle of a refrigerator involves the refrigeration cycle.

1. The compressor compresses a gaseous refrigerant, raising its pressure and temperature.
2. This hot gas moves to the condenser, where it releases heat to the outside air, condensing into a liquid.
3. The liquid refrigerant then flows into the evaporator. Here, it evaporates, absorbing heat from inside the fridge and cooling the interior.
4. Finally, the refrigerant returns to the compressor to restart the cycle.

1. Minimize the frequency of opening the door to maintain temperature.
2. Ensure food is correctly covered to prevent drying out and contamination.
3. Avoid overpacking the fridge to allow adequate air circulation.
4. Regularly defrost and clean the interior to operate efficiently.

Modern refrigeration appliances often include:

1. Built-in ice makers and water dispensers for convenience.
2. Temperature control displays and smart technology for remote monitoring.

Energy efficiency ratings are classified from A to G, where 'A' represents the most efficient appliance, reducing energy consumption and environmental impact. Choosing an appliance with a rating of 'A' ensures lower electricity bills and better performance.

The star rating system indicates the efficiency of refrigeration appliances in storing food over time. Here’s the breakdown:

• Star Rating:
  • 1 Star: -6°C, storage time 1 week
  • 2 Star: -12°C, storage time 1 month
  • 3 Star: -18°C, storage time 3 months
  • 4 Star: -18°C to -25°C, storage time up to one year for new items.