If you are going to purge the system using nitrogen, rather than evacuating the system with a vacuum pump, you will first need to remove the refrigerant gas without releasing it to the atmosphere.
at the metering device before the evaporator
Nitrogen must also have its pressure regulated before it can be used. The pressure in the cylinder is too great to be connected to a system. If a person allowed nitrogen under cylinder pressure to enter a refrigeration system, the pressure could burst some weak point in the system.
Nitrogen must also have its pressure regulated before it can be used. The pressure in the cylinder is too great to be connected to a system. If a person allowed nitrogen under cylinder pressure to enter a refrigeration system, the pressure could burst some weak point in the system.
right before the compressor
charge through a pressure regulator
charge through a pressure regulator
at the metering device before the evaporator
pressure in a refrigeration system is changed in the
To endure that the ONLY gas in the system is refrigerant.
cause its a gas
An evaporator in a refrigeration system works by passing warm air over it's coils.
Cryogenic refrigeration is refrigeration which uses freezing mixtures such as dry ice, soilid co2, liquid co2, or liquid nitrogen. In the liquid co2 or liquid nitrogen method, a compartment is fitted with a temperature sensing element that can be preset. This is in turn connected to a control panel which activates liquid co2 or liquid nitrogen cylinder fitted with regulators to release the refrigerant. This is delivered through a spray header into the compartment until the desired temperature is achieved.