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  Principles of refrigeration    
 
  Electricity for cold rooms & water chillers   
       
 
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Fundamentals of vapour compression refrigeration cycle.
Safety.
Cooling load calculation.
Cold room floor construction.
Equipment selection.
Head pressure control.
Refrigerants.
Special refrigeration system components.
Liquid refrigerant control in refrigeration system.
Operation of thermostatic expansion valve
Piping design.
Double-stage Refrigeration system.
Fundamentals of absorption system & liquid circulation.
Fault diagnosis.
 
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Electrical quantities and units.
Electrical work safety.
Electric circuits.
Magnetism.
Introduction to electrical switches & protection devices .
Cables & Wires.
Introduction to controls and electrical circuits.
Electrical diagram & symbols.
Power & control circuits for basic refrigeration system.
Power & control circuits utilizing pump down, electric defrost, & winter start.
Control circuits for head pressure control.
Project.
   
 
  Principles of hydraulics in water chillers  
 
 
  Electricity for cold rooms & water chillers    
 
 
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Dry coolers.
Cooling towers.
The concept of pressure heads.
Pressure drop.
Pressures on hydraulic system.
Pumps.
Expansion Chambers.
Basic rules in water chillers.
Normal operating conditions in liquid chillers.
Refrigeration faults in liquid chillers.
 
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Refrigeration flow control devices.
Methods of head pressure control.
Hot gas capacity control.
Defrost.
Refrigeration cycle balancing.
The Psychometry of air conditioning processes.
   
 
  Design software     
 
  Qcold  
Cold room cooling load calculation.
 
 
  Qcold  
 
Calculation of refrigeration piping diameters using R22, R134a, R502, R404a, R407c, and R410a.