A discontinuous refrigerant cycle

In summary, a discontinuous refrigerant cycle is a system that operates in distinct phases rather than continuously, involving periods of compression, condensation, expansion, and evaporation. This cycle allows for the effective transfer of heat, utilizing refrigerants that absorb and release heat at various stages. The discontinuous nature can lead to energy efficiency improvements and better control of refrigeration processes, though it may also present challenges in maintaining consistent temperature and pressure levels.
  • #1
LEO31
11
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Hi there, I went to a learning visit to a small plant where it was intended to use a refrigerant cycle to cool down water used in a heat exchanger; from what I've gathered they had to stop using the refrigerant unit altogether as they're doing little batch productions per day, resulting in having to turn off the unit multiple times per day. During the shutting down phase the water sub cools as it has nothing to exchange heat with (as the batch has already ended and the heat exchanger is empty).

My professor didn't have an answer for me, is there really no way to resolve this and being able to use the refrigerant unit accounting for the final transitionary phase ? Thanks
 
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  • #2
LEO31 said:
My professor didn't have an answer for me, is there really no way to resolve this and being able to use the refrigerant unit accounting for the final transitionary phase ?
I don't understand the question (maybe your prof didn't either?). Resolve what? Use the refrigerant unit for what? When you stop needing it you turn it off and it stops working....
 
  • #3
From what I understood while turning the refrigerant unit off the water cools too much as there's no more product to exchange heat with. This sub cooling effect makes the fluid unsuitable for the next batch and allegedly it's the reason why they are not using the unit anymore. Obviously this wouldn't be a problem if the process was continuous but they now switched to a batch production. Hope I made my self clearer
 
  • #4
Shut off the cooler shortly before the batch ends,
OR​
Add a heater to reheat for the next batch,
OR​
Sell the chiller on the Used Equipment market.
 
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FAQ: A discontinuous refrigerant cycle

What is a discontinuous refrigerant cycle?

A discontinuous refrigerant cycle refers to a refrigeration process where the refrigerant does not flow continuously through the system. Instead, it operates in distinct phases or cycles, often involving the storage of refrigerant in a specific state before it is used in the cooling process. This can lead to variations in efficiency and performance compared to continuous cycles.

What are the advantages of a discontinuous refrigerant cycle?

One advantage of a discontinuous refrigerant cycle is the potential for improved energy efficiency in certain applications. By allowing the refrigerant to be stored and released in a controlled manner, it can optimize cooling performance during peak demand periods. Additionally, this type of cycle can reduce the size and cost of some components, such as compressors and condensers.

What are the disadvantages of a discontinuous refrigerant cycle?

Disadvantages include potential inefficiencies and complexities in system design. The need for storage and controlled release of refrigerant can introduce delays and fluctuations in cooling performance. Furthermore, the system may require more sophisticated controls and monitoring to ensure optimal operation, which can increase initial costs and maintenance requirements.

In what applications is a discontinuous refrigerant cycle commonly used?

This type of cycle is often utilized in applications where cooling demand varies significantly, such as in commercial refrigeration systems, heat pumps, and certain types of air conditioning systems. It is particularly beneficial in situations where energy storage can be leveraged, such as during off-peak hours when electricity rates are lower.

How does a discontinuous refrigerant cycle compare to a continuous cycle?

A discontinuous refrigerant cycle differs from a continuous cycle primarily in the flow of refrigerant. In a continuous cycle, the refrigerant flows steadily through the system, providing a more consistent cooling effect. In contrast, a discontinuous cycle may have periods of inactivity or storage, which can lead to variations in efficiency and cooling output. Continuous cycles are generally simpler and more common in traditional refrigeration systems, while discontinuous cycles may offer advantages in specific applications where control over refrigerant use is beneficial.

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