A lumped-parameter thermal model for scroll compressors including the solution for the temperature distribution along the scroll wraps

• A model is developed to predict the temperature in different regions inside scroll compressors.
• Attention is given to gas superheating in the suction process and heat conduction through the scroll wraps.
• The model was successfully applied to predict the compressor temperature under different operating conditions.
• Heat conduction through the scroll wraps was found to reduce slightly the gas discharge temperature.
• Heat flux from the discharge chamber gives rise to nonlinearities in the temperature distribution along the scroll wrap.

A lumped-parameter thermal model is presented to predict the temperature in different chambers and components inside scroll compressors with particular attention to gas superheating in the suction process. Thermal resistances between the components are based on global heat transfer conductances, whereas conduction heat transfer through the scroll wraps is solved via a one-dimensional finite volume method. The thermal model was coupled to a thermodynamic model of the compression cycle and then applied to simulate the compressor performance under different conditions of speed and pressure ratio. The model was able to correctly predict the compressor temperature for operating conditions within the range of those adopted for its calibration. The results showed a strong coupling between the compressor thermal profile and the temperatures of the motor and lubricating oil. It has also been found that heat conduction through the scroll wraps reduces slightly the discharge temperature.