Relationship between compression ratio and temperature in reciprocating compressors
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Can anyone tell me why the medium temperature rises as the compression ratio increases? I have a specific question: For a two-stage reciprocating compressor, if the temperature at the exit of the second stage is high, how should it be adjusted? With a compressor featuring variable-speed control, what is the relationship with this \"one-stage-one\" and \"two-stage-two\" concept? Won’t the variable-speed control for adjusting the load affect the outlet pressure of the compressor? I think it should affect the export pressure; and if one wants to maintain a stable compression ratio, it’s necessary to use a return line. In that case, does the load generated by this stepless control still serve any purpose? In confusion, I hope the hero can offer some guidance...
I’m also confused about this; I hope some expert can provide clear guidance
1. The higher the compression ratio (exhaust pressure/inlet pressure), the more strongly the gas is compressed; the mechanical energy of the piston is converted into the internal energy of the compressed gas, resulting in an increase in temperature. 2. A high outlet temperature can generally be reduced by lowering the inlet temperature or the compression ratio, thereby reducing the exhaust temperature; the temperature of the secondary inlet air can be adjusted using the primary outlet cooler. 3. Continuous control (similar to an automatic transmission) allows the compressor load to vary continuously from 0% to 100%, enabling continuous regulation of the compressor flow rate. Generally, the compressor load should not be too low; in emergency situations, it is necessary to increase the inlet pressure or raise the compressor load. At the minimum required level, it is possible to activate one return line per stage and two return lines per stage (in systems with stepless control, usually only the last return line is used; one return line per stage and two return lines per stage are typically used for compressor load control in manual mode). Continuous control means that the flow rate output by the compressor is equal to the flow rate entering the downstream circuit; when feedback is enabled, the compressor’s load increases, but the flow rate entering the downstream circuit is less than the compressor’s inlet flow rate ；
1) Is the degree of compression fixed for a compressor, since its stroke and piston area are constant? 2) For gases, isn’t the flow rate reflected in pressure? So, if I want to maintain a constant compression ratio, that is, to keep the pressures at the inlet and outlet of the compressor stable, then when variable control increases the load by adjusting the outlet or inlet pressure, wouldn’t increasing the gas flow rate through variable control become ineffective?
If there are 2 cycles of 2, appropriately increasing the value for those 2 cycles of 2 can lower the temperature at the second-stage outlet. . . . The compression ratio is proportional to the compressor load. . . .
I’ve learned it, thanks for sharing:handshake