Category Archives for Reciprocating Compressors

Reciprocating Compressors Capacity Regulation

Almost all refrigeration plants are subject to varying refrigeration loads and, in general, plants operate at part load. The capacity must be reduced, otherwise the evaporating temperature would drop until the plant capacity matched the load. An evaporating temperature that … Continue reading

01. May 2018 by Jim
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Reciprocating Compressors Speed

The usual range of rotative speed of reciprocating compressors is between 800 and 1800 rpm. The minimum rotative speed is generally dictated by the requirement of the oil pump, which because it runs off the compressor shaft needs a minimum … Continue reading

01. May 2018 by Jim
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Reciprocating Compressors Lubricating And Oil Cooling

Although small compressors may be able to achieve adequate lubrication of the moving parts by splash lubrication, virtually all reciprocating compressors used in industrial refrigeration practice are provided with forced lubrication. A positive-displacement pump draws oil from the crankcase and … Continue reading

01. May 2018 by Jim
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Discharge Temperatures And Water Cooled Heads

Figure 4.19 shows some adiabatic discharge temperatures that would occur with ammonia and R-22 were the compressions ideal (frictionless) and with no transfer of heat. The actual discharge temperatures would be higher than those shown because of inefficiencies of the … Continue reading

01. May 2018 by Jim
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Maximum Pressure Ratios And Pressure Differentials

In catalogs showing refrigerating capacity and power requirements of reciprocating compressors, manufacturers do not show performance for all combinations of evaporating and condensing temperatures. Also, some manufacturers show data for conditions that are flagged and the user is asked to … Continue reading

01. May 2018 by Jim
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Reciprocating Compressors Construction Details

Most industrial reciprocating compressors are built with two, three, or four banks of cylinders, each bank incorporating either two or four compressors side-by-side m the axial orientation. This arrangement allows a choice of compressor with 4 6, 8, 12, or … Continue reading

01. May 2018 by Jim
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Pressure Drop Between Evaporator And Compressor

The life of a manufacturer of any type of compressor is complicated when a designer or contractor fails to account for the pressure drop of refrigerant in the suction line between the evaporator and compressor. The person ordering 0°C for … Continue reading

01. May 2018 by Jim
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Effect OF Superheating Of Suction Vapor On Catalog Ratings

Another specification that often varies from the compressor catalog of one manufacturer to another is the number of degrees of superheat of the vapor entering the compressor. If a catalog specifies some superheat of the vapor, it is almost always … Continue reading

01. May 2018 by Jim
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Effect Of Liquid Subcooling On Catalog Rating

Compressor manufacturers express refrigerating capacity in their catalogs based on a certain number of degrees of subcooling of the liquid entering the expansion valve and a certain number of degrees of superheat of vapor leaving the evaporator. These two conditions … Continue reading

01. May 2018 by Jim
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Effect Of Evaporating Condensing Temperatures On System Efficiency

The influence of both the evaporating and condensing temperatures on the refrigerating capacity and the power requirement of reciprocating compressors has now been studied. Figure 4.10 is a summary of the influence of these temperatures on the refrigerating capacity and … Continue reading

01. May 2018 by Jim
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