Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Numerical Analysis Of Volumetric Inefficiencies Of A Small Variable Capacity Reciprocating Compressor
Submission Author:
Willian Silva , SC , Brazil
Co-Authors:
Willian Silva, Alessandro dos Santos Pereira, Renatto Yupa-Villanueva, Cesar Deschamps
Presenter: Willian Silva
doi://10.26678/ABCM.ENCIT2022.CIT22-0335
Abstract
Simulation models are of paramount importance in the design of highly reliable and efficient compressors. This manuscript reports a simulation model to predict the volumetric efficiency of a variable-capacity reciprocating compressor adopted in household refrigeration systems for ASHRAE LBP and ASHRAE MBP operating conditions from 1800 to 6300 rpm. In addition to that, a recently proposed method is used to quantify the main sources of volumetric inefficiencies, including the effects of suction gas superheating, suction process, supercharging/backflow, re-expansion, leakage through the piston-cylinder, irreversibility during re-expansion and valve closure delay. After being validated through comparisons with experimental data, the model was used to analyze the compressor performance under different operating conditions to identify the most critical parameters regarding the volumetric efficiency. The results have shown a nonlinear variation for the volumetric efficiency with the compressor speed under both operating conditions. Additionally, we found that all the inefficiencies for the LBP operating conditions are greater compared to those of the MBP operating conditions for all compressor speed interval. Finally, an increase in compressor speed was found to significantly increase inefficiencies associated with suction gas superheating, suction process, and discharge valve closure delay.
Keywords
Refrigeration, Reciprocating compressor, Volumetric Efficiency, variable-capacity
