SUCTION LIQUID LINE SIZING CHARTS USING (吸液线大小图表使用).pdf

SUCTION LIQUID LINE SIZING CHARTS USING (吸液线大小图表使用).pdf

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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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