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2010 ashrae handbook refrigeration
Weld-in line valves with handbook nonwearing body parts are available.
The disadvantage of handbook this device is the refrigeration extra pressure drop it causes when the system is at the desired operating conditions.
Steel (3000 psi) ground joint unions are used for gage and pressure control lines with refrigeration screwed valves and for joints up.75.
Often, a valve (preferably automatic) is installed in ashrae the drain from the lubricant separator, open only when the temperature at the bottom of the separator is higher than the condensing temperature.If the compressor cannot be allowed to cycle off during low load, an refrigeration acceptable alternative is a hot-gas bypass.Suction mains running to and from the suction trap or accumulator should be pitched toward the trap at 1/8.Good suction line systems have a total friction drop of 1 to 3F pressure drop equivalent.Dual relief valve arrangements allow testing of the relief valves (Figure 13).The vessel must be sized properly to separate refrigeration liquid from vapor that is returning to the high-stage compressor.Design ensures that the receiver is cooler than the condensing temperature.Fan-coil, direct-expansion evaporators can be used, but they are not generally recommended unless the suction temperature is 0F or higher.Ammonia Refrigeration Systems Flooded shell-and-tube evaporators are often used in ammonia systems in which indirect or secondary handbook cooling fluids such as water, brine, or glycol must be cooled. High- window and low-pressure cutouts and gages and lubricant pressure failure cutout are installed on the compressor side of the stop photo valves to protect the compressor.
Wet suction return lines (recirculation system) should use angle refrigeration window valves or globe valves (with their stems horizontal) to reduce the possibility of liquid plus pockets and reduce pressure drop.Therefore, the saturation temperature at this surface is higher than that in the suction line, which is not affected by the liquid pressure.An air outlet damper may be closed plus during hide defrosting to prevent thermal circulation of air through the unit, which affects the temperature of the cooled space.Table 3 presents line sizing information for pumped liquid lines, highpressure liquid lines, hot-gas defrost lines, equalizing lines, and thermosiphon lubricant cooling ammonia lines.The capacity is affected less than 3 when applied studio from 40 to 40F extremes.The section on performance evaluation has been revised and integrated with the section on standards.5 Suction Accumulator with Warm Liquid Coil trap can start and stop the liquid ammonia pump, sound an alarm in case of excess liquid, and sometimes stop the compressors.