Estimation of power and cost for a centrifugal gas compressor requires knowing which of the following: P. Inlet pressure, Q. Compressor rpm, R. Delivery pressure, S. Inlet volumetric flow rate?
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Answer: A. P, Q and R
Explanation
Inlet pressure determines the initial thermodynamic state of the entering gas stream. Delivery pressure sets the required compression ratio and final discharge energy state. Inlet volumetric flow rate dictates the physical size and volumetric capacity of the compressor. Centrifugal compressors add kinetic energy to gases using rotating impellers and diffusers. Thermodynamic performance calculations require mass or volumetric flow rates and pressure ratios. Compressor power input depends directly on enthalpy changes across the machine.
Gas pipeline transmission stations rely on accurate power estimations to minimize energy costs. Chemical plants require precise compressor sizing to maintain proper reactor feed pressures. Understanding operating pressures prevents mechanical overloading and catastrophic compressor failures. Compressor rpm influences performance curves but is secondary to pressure and flow rate. Omitting volumetric flow rate makes calculating the required mass throughput and power impossible. All three selected parameters are mandatory for accurate thermodynamic power consumption calculations.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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