Benefits of

LCPR's

Compared to Pumped Circulation System

• Reduced charge with the low-pressure receiver (typically 70% less) 
• Reduced capital cost
• Simplicity of operation
• No power required for refrigerant pumps
• Easier to maintain
• Less pressure drop in wet suction line
• Smaller suction and liquid lines
• Simpler and more efficient defrost system
• Simpler control system

Compared to DX Systems

• Enhanced efficiency
• Lower compressor discharge temperature
• Better use of evaporator surface (flooded operation)
• Good distribution in evaporator due to sub-cooling
• Receiver can store excess refrigerant
• Higher reliability and reduced risk of compressor damage
• All control valves on the packaged unit
• Can combine easily with reversed cycle defrost
• Improved efficiency in low ambient conditions
• Longer life and lower maintenance costs
• Minimum sitework required
• Closer approach temperature in evaporator (no superheat)
• Automatic oil return from evaporator
• Performance not adversely affected by pressure drop in liquid line
  • Better control under part load conditions

   

  
  Benefits of using low pressure receivers with ammonia.
  
  
  • evaporator is overfed purely because the effect of the refrigerant has been increased by the sub-cooling.
  • it acts as a liquid receiver.
  • it acts as a suction trap.
  • it allows refrigerant to be supplied to the evaporator, which can then operate in a flooded manner.
  • it allows excess evaporators to be operated efficiently at very low temperature differences (no need to produce a superheat signal in the evaporator).
  • it allows the ammonia expansion device to be of the high-pressure float type.
  • it allows the collection of excess lubricating oil which can be returned to compressor suction.
  • The evaporator is overfed purely because the effect of the refrigerant has been increased by the sub-cooling.
  • It reduces power consumption
  • Compressor/receiver packages built in factory so less site work