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Computational model of start-up process for reciprocating compressors.

Number: 1222

Author(s) : FALCETTI E. P., BOTEGA T. F., CABEZAS-GÓMEZ L.

Summary

The development of more efficient and optimized compressors depends on understanding the loads present during their start-up and steady operation in the refrigeration system. The loads arise mainly from the gas compression process in the cylinder, the pressure drop in the suction and discharge systems and the friction in bearings. During compressor start-up, the electric motor must supply the required torque to the mechanical kit to overcome these loads and accelerate the mechanism. Thus, the compressor start-up is considered critical in the design of compressors and its components, such as electric motors. This work aims to present the development of a computational model for simulating a reciprocating compressor start-up, considering the coupling between the induction electric motor and the mechanical system. The mechanical loads (friction from bearings and from fluid compression and pressure drop) are calculated coupled with the torque from the motor, considering the inertial forces in the mechanism. A 0D/1D fluid dynamic model was used to determine the flow in the compressor suction and discharge circuits, as well as in the cylinder compression process. A simplified motor model was used to represent the torque available in the motor as a function of the instantaneous angular velocity of the shaft/rotor. An experimental start-up study using an instrumented compressor determined the movement of the mechanical kit, as well as the pressure variation in the system through pressure transducers and encoder installed in established regions. The experimental results presented are used to validate the numerical model and demonstrate its capacity to simulate the compressor starting operation with a satisfactory accuracy. Finally, a parametric analysis indicated the main components that impact the starting process.

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  • Original title: Computational model of start-up process for reciprocating compressors.
  • Record ID : 30030290
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15

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