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SUCTION LIQUID LINE SIZING CHARTS USING (吸液线大小图表使用)
SUCTION LIQUID LINE SIZING CHARTS
USING LINE SIZING CHARTS
Basis
These line sizing charts are based on a suction pressure drop equivalent to a 2°F change in saturation
pressure and liquid line pressure drop of 5 psi. For R-404A Low Temperature 1 psi; for R-404A and
R-22 Medium Temperature 2 psi is used. This is the maximum allowable pressure drop for the entire
piping run regardless if it is 50 or 250. The advantage of the graphic representation of this
information is to show just how close to full capacity a particular selection is. This is true for both the
condensing unit capacities on the individual specification sheets or the separate suction line sizing
charts. When the suction line graphs are arranged according to temperature the relationship of
temperature and line sizing become readily apparent. The lower the temperature, the larger the line
required for the same heat load.
Liquid Line Sizing
Equivalent Feet
Notice the phrase Equivalent Feet (applies to meters as well). Fittings
added to a refrigerant line induce an added pressure drop in the line. The
added pressure drop is accounted for by adding extra length (see chart on
page MI-11) to the piping run which will equal the same pressure drop
produced by the fittings. In order to determine the equivalent footage, add
the actual length of the piping run and the equivalent footage assigned for
each particular fitting. Plot the intersection of the horizontal BTUH line with
the vertical equivalent footage line. The area in which the plotted point falls
in the recommended line size.
Liquid Line Sizing
Due to the lack of space, the specification sheets have just one column for
a liquid line size. The line sizes given on the specification sheets are based
on a 5 pound pressure drop for the entire piping run, from 50 to 250.
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