Types of Refrigeration Systems

1-Natural Refrigeration

In olden days refrigeration was achieved by natural means such as the use of ice or evaporative cooling.

v  In earlier times, ice was either:

1.        Transported from colder regions.

2.        Harvested in winter and stored in ice houses for summer use.

3.        Made during night by cooling of water by radiation to stratosphere.

v  Evaporative Cooling

Evaporative cooling is the process of reducing the temperature of a system by evaporation of water.

v  Cooling by Salt Solutions

Certain substances such as common salt, when added to water dissolve in water and absorb its heat of solution from water (endothermic process). This reduces the temperature of the solution (water+salt).

Sodium Chloride salt (NaCl) can yield temperatures up to -20˚C and Calcium Chloride (CaCl2) up to - 50˚C in properly insulated containers.

2-      Artificial Refrigeration

v  Vapour Compression Refrigeration Systems

•          
Professor William Cullen (1755)

•           Jacob Perkins (1835)

•           John Hague

  

v  Vapour Absorption Refrigeration Systems

•           John Leslie (1810)

•           Ferdinand Carre (1860)

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