Refrigerant Distributors

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When refrigerant passes through the thermostatic expansion valve (TEV), the intended circuits do not always receive equal amounts of refrigerant. If not corrected, system performance will certainly suffer. Refrigerant separates unevenly for two reasons:

• refrigerant is predominantly liquid by weight, but vapor occupies most of the volume;

• liquid and vapor flow at different velocities.

When refrigerant flows through a simple header, as shown below, the flow will be greatest to the path of least resistance.

 

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