Refrigeration Accumulator Level 1

[zamakaze]

In a typical propane refrigeration loop (e.g. in photo), there is always an accumulator or surge vessel. There is no level control on this vessel...so how does the level in the vessel get maintained. The expansion valve usually a level control valve maintains level in chiller. Does that valve indirectly affect level in accumulator. Does this accumulator have any typical criterion for sizing like time b/w levels or residence time?

 

[Compositepro]

There is a predetermined mass of refrigerant charge in the closed loop.

 

[EngrPaper]

Level control is for controlling a vapor/liquid barrier. In the accumulator, it is entirely vapor - hence no level to control.

 

[georgeverghese]

During maintenance, the surge drum should accomodate the max normal liquid inventory of at least the largest kettle in this closed loop ( and any upstream connected piping).
So, if min operating level in surge drum is say 30%, and max is say 85%, this incremental volume should be the liquid volume of that kettle.

 

[LittleInch]

Level is a function of the flow around the loop and whether it is in steady state or changing flow.

A sudden increase in cooling gas flow will result in more demand for liquid as it evaporates in the chiller before the compressor winds up and the cooler starts.

I don't believe engpaper is correct. The surge drum will be liquid otherwise the chiller won't work.
Sizing it is a balance.

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