Example Of Reciprocating Compressor Performance Report

A reciprocating compressor is uses a crankshaft driven piston to produce high pressure gases, its connected to an electric power as an input which then convert to numerous energy type among involving that in motion (mechanical energy) and electrical energy. It does the compression in a diabetic, isothermal and polytrophic processes. This means that the compressor does work that involves the thermodynamic processes with no gain or loss in heat and constant temperature all through. Most reciprocating compressors work singly or are driven by pistons which are connect to the crankshaft through the connecting rod.
No compressor has a perfect efficiency has there has to be a waste of some energy which is from the input, the losses being those of heat transfer from the compressor encasing the atmosphere and mechanical losses resulting from the friction developed from the parts involved in motion. From here the mechanical power can be calculate for the set speed of the compressor which involves the following to determine the machine efficiency: mechanical efficiency, volume flow rate, mass flow rate and isothermal efficiency.
Energy lost can be also through heat flowing outward through the compressor walls and pipes mainly which is another cause on addition to those in mechanical. Here we move air under constant temperature conditions, isothermal work is required where we will be having the locked temperatures of poorly insulated wall equal to temperature of the outside atmosphere, from a low to high pressure.
For one to retain much energy readily, isothermal efficiency requires one to have a storage that is leak proof tank contain a given gas with a fixed value of isothermal work. The retained energy will be transferred for later use by allowing the gas to move back to a lower atmospheric pressure location through a poorly insulated pipe work (constant temperature). Isothermal work qualifies as the useful work at this final stage in the chain of events in the compressor and belongs in the numerator of an efficiency. Here isothermal efficiency can be calculated through the energy input.
For mechanical efficiency there is a decrease in the delivery pressure up to that point when it rises to its optimum before dropping. The thermal efficiency on the other hand has its delivery pressure increasing up to optimum where there's a gradual decrease up to where it runs flat (becomes constant).
For mechanical efficiency against delivery pressure, the graph is due to static friction before motion is started upon which after obtaining motion, friction reduces up to that optimum where friction again develops (increases) decreasing the mechanical efficiency gradually.
For the thermal efficiency against the delivery pressure, the graph nature it's because an increase in the delivery pressure results into a simultaneous increase in the thermal efficiency though set in an isothermic condition. The efficiency here hold at its optimum where it goes down up to a level where it remains flat as friction increases.