Chiller expansion valve installation and matching

Expansion valve chiller refrigeration system as the four components of large chiller chiller in a large chiller application,the appropriate choice of expansion valve and the normal installation of a direct impact on the cooling capacity of screw chillers and the stable operation of the refrigeration system.
First,matching

According to R,Q0,t0,tk,the loss of resistance of the liquid lines and valves to carry out the steps:

Determine the pressure difference across the expansion valve;

Determine the form of the valve

Select the valve model and specifications.

1,to determine the pressure difference across the valve:

ΔP=PK-ΣΔPi-Po(KPa)

Where:PK-Condensing pressure,KPa,ΣΔPi-ΔP1+ΔP2+ΔP3+ΔP4(ΔP1 for the liquid pipeline resistance loss;ΔP2 for the elbow,valves and other resistance loss;ΔP3 for the liquid tube is raised Pressure loss,ΔP3=ρɡh;ΔP4 for the liquid head and the separation of the capillary resistance loss,usually each 0.5bar);Po-evaporation pressure,KPa.