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    188宝金博页面版: SUCTION

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    内容提示： MI - 126-Apr-06SUCTION & LIQUID LINE SIZING TYLER SPEC GUIDESUCTION & LIQUID LINE SIZING CHARTSUSING LINE SIZING CHARTSBasisThese line sizing charts are based on a suction pressure drop equivalent to a 2°F change in saturationpressure 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 entirepiping run regardless if it is 50' or 250'. The advantage of the graphic representatio...

    文档格式：PDF | 页数：22 | 浏览次数：62 | 上传日期：2016-03-25 03:53:51 | 文档星级：
    MI - 126-Apr-06SUCTION & LIQUID LINE SIZING TYLER SPEC GUIDESUCTION & LIQUID LINE SIZING CHARTSUSING LINE SIZING CHARTSBasisThese line sizing charts are based on a suction pressure drop equivalent to a 2°F change in saturationpressure 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 entirepiping 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 thecondensing unit capacities on the individual specification sheets or the separate suction line sizingcharts. 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 linerequired for the same heat load.Equivalent FeetNotice the phrase "Equivalent Feet" (applies to meters as well). Fittings added to a refrigerant line induce an added pressure drop in the line. Theadded pressure drop is accounted for by adding extra length (see chart onpage 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 foreach 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 SizingDue 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'.Example: A 25,000 BTUH load will require a 3/8" line for 100 equivalent feet (Point A). At 150 equivalent feet, a 1/2" line would be required for the same load (Point B).Liquid Line Sizing

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