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Transient Behavior of R744 Vehicle Refrigeration Cycles and the Influence of the Suction Side Accumulator Design
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2006 by SAE International in United States
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The article presents new insights regarding accumulator behavior and its impact on transient and steady-state system behavior that have come to light during the development process of the R744 refrigeration cycle. A new accumulator model is introduced featuring a special liquid height dependent refrigerant density model as well as the pressure drop related mixing behavior of the oil bleed hole and J-tube inlet mass flow rate. The accumulator model is validated over a wide accumulator operating range. Experiments were carried out on a setup specifically designed for this purpose because literary references to experimental data on accumulator behavior are scarce. Comprehensive measurements show clearly the influence of the mass flow rate, the charge and geometry parameters e.g. the oil bleed hole diameter on the accumulator outlet properties. The measured accumulator vapor outlet quality, which has a major impact on the horizontal cycle process position in the p/h diagram, is well reflected by the calculations based on the new accumulator model. The paper provides an insight into the comparison of simulation versus measurement results for a transient validated refrigeration cycle model. A simulation sensitivity analysis is then carried out on the basis of the validated cycle model, in order to provide information on the accumulator's influence on the transient and steady-state cycle behavior.
CitationRaiser, H., Heckenberger, T., Tegethoff, W., Köhler, J. et al., "Transient Behavior of R744 Vehicle Refrigeration Cycles and the Influence of the Suction Side Accumulator Design," SAE Technical Paper 2006-01-0162, 2006, https://doi.org/10.4271/2006-01-0162.
- Baehr H.D. Springer-Verlag 2002
- Collier J.G Thome J.R. Convective Boiling and Condensation Third Oxford Science Publication; Clarendon Press Oxford 1994
- Finlayson S.M. Dickson T.R. Accumulator sizing and evaluation technique based on theoretical optimum system performance VTMS7 2005; SAE-paper 2005-01-2048
- Lemke N. 2 2004
- Raiser H. 2 2005
- Schwarz T. Galluzzi M. Richardson D. Radermacher R. Model to investigate the performance of accumulators in vapor compression systems Compressor Engineering & Refrigeration & Air Conditioning Conference Purdue USA 2002
- Wang S. Gu J. Dickson T. Model to simulate the behavior of accumulators in automotive air conditioning systems VTMS7 2005; SAE-paper 2005-01-2047