1. Fridges © PDST Home Economics

3. Standard  Has a separate ice box which usually has star rating of  or   Has a variety of moulded shelves

4. Larder Fridge  No freezer compartment  A separate freezer is needed for frozen food

5. Fridge-freezer  Has 2 separate cabinets, a fridge and  a freezer  Usually has a separate door for each compartment  Can be bought in a variety of forms:  e.g. 1/2 freezer, 1/2 fridge  1/3 fridge, 2/3 freezer

6. Design and Construction Outer casing of enamelled steel Inner lining usually polystyrene Layer of insulating material between steel and polystyrene Plastic–coated shelves Adjustable bottle racks and moulded compartments Plastic drawers Ice box Automatic light Thermostat Door has magnetic closure

7. Modern features

8. Zoned Refrigerator Here certain parts of the refrigerator have different temperature.

9. American Refrigerator This is a larger refrigerator which is usually one and a half times the size of a standard fridge.

10. Tall bottle shelves This allows tall bottles to be placed upright, it saves space and prevents spillages

11. Ice makers Chilled drink dispenser

12. Integrated fridge door to match kitchen cabinet doors Integrated fridge door

13. Working Principle Refrigeration is a cooling process A compressor is found at the base of the fridge This compressor contains refrigerant – Freon 12 or liquid ammonia

14. A refrigerant is a substance that turns from liquid to gas or gas to liquid very quickly The motor activates the compressor which forces the refrigerant into the condenser Motor -----  Compressor----  Refrigerant----  Condenser

15. Tray Evaporator Condensor Compressor Motor

16. The condenser causes the gaseous refrigerant to cool, changing it into a liquid The refrigerant moves to the evaporator where it turns back into a gas

17. The liquid evaporates as heat is taken from the fridge cabinet This cools the fridge The refrigerant returns to the compressor and it starts again

18. Motor Compressor Condensor Tray Evaporator Motor: to power the compressor Compressor: forces liquid into the condenser Condensor: cools the gas and changes it into a liquid Evaporator: evaporates liquid by drawing heat away from interior of the refrigerator. Gas returns to the compressor Tray: collects liquid during defrosting

19. Use Avoid opening unnecessarily. Why? It raises the temperature putting pressure on motor. Cool foods before placing in fridge. Why? To avoid raising fridge temperature Cover foods in fridge. Why? To avoid drying out and cross-flavouring Store raw fish/meat below cooked food/dairy. Why? To avoid cross contamination Use food in rotation.Why? To prevent wastage & food passing its best-before date Do not over pack? Why? To allow air circulation Thaw frozen foods in the fridge.

20. Care Position away from heat source Keep clean and defrost regularly Inside - wash with breadsoda and water Don’t use washing-up liquid or smelling agents inside Outside - wipe with hot soapy water and dry Back – Keep dust –free Unused fridge - Unplug, keep clean and door open

21. Star - rating A star rating applies to the storage of frozen foods One star rating -6˚C storage 1 week Two star rating -12˚C storage 1 month Three star rating -18˚C storage 3 months Four star rating -18˚C to -25˚C storage up to 1yr

23. Fridges http://www.ior.org.uk/ior_/fantastic_fridges_site/scien ce/fridge1/fridgediag.htm

24. Worlds Biggest Fridge Samsung