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What is the purpose of the purge unit?
The purpose of the purge unit is to maintain a low level of non-condensibles in the chiller condenser. A gas mixture of refrigerant, air and water vapor is drawn off from the chiller condenser and separated.
What does a purge do on a chiller?
The function of the purge system is to maintain the refrigeration system free of noncondensable gases such as air, moisture, acids and oil residue. Accumulation of these noncondensable gases within the refrigeration system causes an increase in condensing pressure and results in the loss of operating efficiency.
What is the primary purpose of a purge unit on a low pressure chiller?
25 Cards in this Set
| Where should the discharge from a rupture disc be piped for venting? | Outdoors |
|---|---|
| What is the primary purpose of a purge unit on a low-pressure chiller? | Remove non-condensables from the system. |
| Where is the rupture disc located on a centrifugal chiller? | Evaporator |
What is purging in refrigeration system?
The process of removing the colorless, odorless air is called purging. Accumulated air not only insulates the transfer surface, it effectively reduces the size of the condenser. To com- pensate for this size reduction, the system must work harder by increasing the pressure and temperature of the refrigerant.
Where is the suction of a purge unit connected?
Where is the suction of a purge unit connected? The inlet of the purge unit is typically connected to the top of the condenser.
Where is a purge unit located in a low pressure system?
Where is the purge unit located in a low-pressure system? The top of the condenser. If a strong odor is detected during the recovery process, a compressor burn-out may have occurred.
What are two basic categories of chillers?
Final Test
| Question | Answer |
|---|---|
| Two basic categories of chillers are? | Compression cycle and absorption |
| Four compressors commercial A/C system | 1) scroll 2) screw 3) reciprocate 4) centrifugal |
| Control the capacity of a screw compressor | Slide valve |
| The compressor used for low pressure chillers | Centrifugal |
What is typical advantage of water cooled recovery unit?
Water-Cooled Recovery Units are most common while recovering refrigerant from a chiller system. The advantages of these units are: Faster Recovery. A large amount of refrigerant can be recovered easily and quickly.
Which gas is used for purging?
The most common purge gases commercially available in large quantities are nitrogen and carbon dioxide. Other inert gases, e.g. argon or helium may be used.
How do I get the air out of my HVAC system?
Turn on the compressor and depress the access valve on the high side. This time, when gas is no longer coming out the high side access valve, let the valve close. The air is now purged from the system.
Why do I need a purge unit for my chiller?
As a result, leaks in the chiller system may draw air into the system, contaminating the refrigerant. This contamination degrades the performance of the chiller system. To address this problem, existing low pressure chillers include a purge unit to remove contamination.
What is the purpose of a purge unit?
A purge unit is typically used to remove air and other non-condensables from the refrigeration system. The purge unit is a small, independent, adjunct refrigeration system that separates the non-condensables from the refrigerant and recondenses and collects any refrigerant in the exhaust vent stream.
Where are purge recovery units used in a centrifugal air conditioning system?
1. A purge-recovery unit is used in a centrifugal air conditioning or refrigeration system for what purpose? 2. The inlet of the purge-recovery units used with some compressors in low pressure refrigeration systems is connected to the top of what system component? Nice work!
Which is purge unit discharge the most refrigerant?
Those purge units which discharge the highest percentage of refrigerant with the air being removed. b. Those purge units which discharge very little refrigerant with the air being removed. c. Those purge units which draw very little electrical power. d. Those purge units which need the least amount of on-going maintenance.