 |
| Fig: Refrigeration Cycle System Diagram for Centrifugal Chiller |
What is Refrigeration Cycle of a Centrifugal Chiller?
Description of the refrigeration cycle is perfectly represented in the p-h chart or Pressure-Enthalpy chart.
This is the formal way to define the refrigeration cycle which shown in the figure.
But understand very first and easily, let’s analyse the components of a 2-stage centrifugal chiller in the framework of the refrigeration cycle as shown in the above schematic diagram. Here we considered 2-stage compressor centrifugal chiller to describe refrigeration cycle.
This is the formal way to define the refrigeration cycle which shown in the figure.
But understand very first and easily, let’s analyse the components of a 2-stage centrifugal chiller in the framework of the refrigeration cycle as shown in the above schematic diagram. Here we considered 2-stage compressor centrifugal chiller to describe refrigeration cycle.
If we follow the refrigeration vapour flow route we find that refrigerant vapour leaves the evaporator and flows to the compressor.
Vapour is compressed to a higher pressure and temperature in a compressor.
The high-pressure refrigerant vapour then travels to the condenser where it rejects heat to water and then leaves as a saturated liquid.
The pressure drop created by the first expansion device causes part of the liquid refrigerant to evaporate and the resulting mixture of liquid and vapour enters the economizer.
Here, the vapour is separated from the mixture and routed directly to the inlet of the second-stage impeller.
The remaining saturated liquid refrigerant enters the second expansion device.
Sponsored:
Vapour is compressed to a higher pressure and temperature in a compressor.
The high-pressure refrigerant vapour then travels to the condenser where it rejects heat to water and then leaves as a saturated liquid.
The pressure drop created by the first expansion device causes part of the liquid refrigerant to evaporate and the resulting mixture of liquid and vapour enters the economizer.
Here, the vapour is separated from the mixture and routed directly to the inlet of the second-stage impeller.
The remaining saturated liquid refrigerant enters the second expansion device.
Sponsored:
The pressure drop created by the second expansion device lowers the pressure and temperature of the refrigerant to evaporator conditions, causing a portion of the liquid refrigerant to evaporate.
The resulting mixture of liquid and vapour enters the evaporator.
In the evaporator, the liquid refrigerant boils as it absorbs heat from the water and the resulting vapour is drawn back to the compressor to repeat the cycle.
The resulting mixture of liquid and vapour enters the evaporator.
In the evaporator, the liquid refrigerant boils as it absorbs heat from the water and the resulting vapour is drawn back to the compressor to repeat the cycle.
 |
| Fig: Typical P-H Chart for Chiller Refrigeration Cycle |
The change in enthalpy from C to A that occurs during the refrigeration cycle is called the refrigeration effect.
This is the amount of heat that each pound [kg] of liquid refrigerant will absorb when it evaporates.
This is the amount of heat that each pound [kg] of liquid refrigerant will absorb when it evaporates.
The benefit of the economizer can be demonstrated by comparing the refrigeration cycles with and without an economizer.
Without an economizer, refrigerant from the condenser ➅ expands directly to evaporator conditions ➉, producing a smaller refrigeration effect (B to A). Some chiller designs may sub-cool the liquid refrigerant in the condenser (➅ moves to the left) to increase this refrigeration effect.
Sponsored:
Sponsored:
Also, in a chiller without an economizer, all of the refrigerant vapour must go through both stages of compression to return to condensing conditions.
In a chiller with an economizer, refrigerant vapour that flashes in the economizer bypasses the first stage of compression, resulting in an overall energy savings of 3 to 4 per cent.
In a chiller with an economizer, refrigerant vapour that flashes in the economizer bypasses the first stage of compression, resulting in an overall energy savings of 3 to 4 per cent.
Really informative post, which you have shared. You are write very clean and helpful. I would like to share one website Refrigerantworld.com, here you get R22, R410, R134 and R424a refrigerant at wholesale price with fast shipping.
ReplyDeleteThank you very much, I think everybody related with HVAC will be benefited reaching your Refrigerant related site.
DeleteThis is the perfect blog for anyone who wants to know about this topic. The article is nice and it has known very important things over here. We also post my manufacture Refrigeration and Air Conditioning Solution details & provide best service at cheap cost for us.
ReplyDeleterefrigeration in Auckland.
Nice and helpful blog really it is very nice to read. Thanks for sharing the informative blog looking for more updates. Buy R134a by following this link.
ReplyDeleteI am heartily thankful to you for sharing this best knowledge. This information is helpful for everyone. So please always share this kind of knowledge. Thanks once again for sharing it. pls visit our website test and tag services sydney
ReplyDeleteThanks for sharing this useful article! Well explained about refrigeration chillers in India. Keep posting.
ReplyDeleteClearly explained about refrigeration cycle and Freezing Gas. Really informative. Looking forward for more blogs.
ReplyDeleteThe refrigeration cycle of a centrifugal chiller and R134A involves a compressor, a condenser, an expansion or-throttling device, and an evaporator. The compressor draws in refrigerant vapor from the evaporator and compresses it, causing it to condense in the condenser. The vapor then cools and condenses, releasing its latent heat of vaporization and cooling the working fluid. The reduced-pressure coolant then passes through an expansion device and into the evaporator, where it evaporates, absorbing heat from the refrigerated space. This thermal energy is then discharged either to the outdoors or to a nearby process. The cycle is then complete, and the system is in a state of equilibrium and can be used for cooling.
ReplyDelete