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Optimal spool compressor aspect ratio for R134a and R1234z(E).

Number: 1379

Author(s) : TANVEER M. M., BRADSHAW C. R., OROSZ J., KEMP G.

Summary

Simulation models are often employed for parametric analysis and guide compressor prototype development, particularly for novel devices like the spool compressor. In this study, a detailed performance evaluation study is conducted to find the best aspect ratio for 105 in3 spool compressor using refrigerants R134a and R1234ze(E). The spool compressor is a novel compressor technology that can provide competitive performance for low-pressure refrigerants (like R1234ze(E)) with a compact design. A parametric study is presented for eccentricity ratio (rotor diameter to bore diameter) of 0.75 to 0.9. For each eccentricity ratio, the compressor L/D ratio (axial length to bore diameter) varies from 0.4 to 3. Two different operating conditions are simulated to represent the standard conditions for unitary equipment application and chillers, 42 ◦F, 45 ◦F and 125 ◦F, 130 ◦F, evaporating and condensing temperatures, respectively. A spool compressor model developed by Bradshaw and Groll (2013) is extended and used to simulate the compressor performance by first extending the model validation to include 30 Rton and 40 Rton cooling capacities using R134a and R1234ze(E). An aspect ratio analysis is developed for various displacement volumes to evaluate the effect of the compressor size on the optimum design. The preliminary results suggest that the volumetric and isentropic efficiencies can be maximized by using eccentricity ratio of 0.75 and L/D values around 1.5.

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  • Original title: Optimal spool compressor aspect ratio for R134a and R1234z(E).
  • Record ID : 30030313
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15
  • Document available for consultation in the library of the IIR headquarters only.

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