DESIGN AND CONSTRUCTION OF A BEDSIDE REFRIGERATOR

CHAPTER ONE
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1.0                                    INTRODUCTION
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                  Ordinarily, refrigeration stands for the production of a cool confinement with respect to the surroundings. The Americans Society of Refrigerating Engineers (ASRE) defines refrigeration as “the science of providing and maintaining temperature below that of the surroundings atmosphere”. Other definition put refrigeration as “the artificial withdrawal of the heat produced within a space or by substance and provision of a temperature lower than that which would exist under the influence of the surroundings”. A refrigerator (colloquially fridge ) is also a common household appliance that consist of a thermally insulated compartment and a heat pump(mechanical, electronic or chemical) that transfers heat from the inside of the fridge to its external environment so that the inside of the fridge is cooled to a temperature below the ambient temperature of the room cooling in a popular food storage techniques in developed countries
 
 
 
       In a simple form, refrigeration is a branch of science that deals with heat removal and maintaining of a low temperature in a confined space.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1.1    HISTORICAL BACKGROUND
 
 
 
 
 
 
      Since the end of the First World War, the rise in our standard of living has become more and more noticeable than any other time in history. We live in an age of progress as new ideas are constantly being developed and industries springing up everywhere with a view to making life more meaningful for mankind.
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