Modeling of R-410A variable capacity compressor with Modelica and experimental validation |
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| Affiliation: | 1. AAON Inc., Tulsa, OK, USA;2. School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK, USA;3. Dipartimento di Energia, Politecnico di Milano, Milan, Italy;1. Ray W. Herrick Laboratories, School of Mechanical Engineering, Purdue University, West Lafayette 47907-2099, IN, USA;2. Air Squared Inc., 675 E 124th Ave, Thornton, CO 80241, USA;1. Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, College of Mechanical Engineering, Quzhou University, Quzhou 324000, China;2. Hongwuhuan group Co. Ltd, Quzhou 324000, China;3. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | This paper presents an analysis of modeling methods for a short cycling, R-410A scroll compressor. Two parametric efficiency models of the short cycling scroll compressors are investigated, one with steady-state mean, and one with time varying efficiencies. Additionally, a dynamic model of a short cycling scroll compressor that incorporates scroll geometry, leakage, and a mathematical approximation of the digital capacity mechanism has been developed and verified against experimentally obtained data. Agreement with data for all methods was generally good, though in the dynamic model refrigerant mass flow was found to match observations when neglecting leakage. To validate the proposed models, a novel experimental testbed was developed by retrofitting a 15 ton nominal capacity rooftop heat pump with a short cycling scroll compressor. Unit operating conditions were varied in a parametric fashion using a large scale psychrometric chamber and the compressor transient performance was evaluated at full and part loads. |
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| Keywords: | Scroll compressor Dynamic simulation Short cycling Capacity control Compressor modeling Compresseur à spirale Simulation dynamique Cycle court Contrôle de capacité Modélisation de compresseur |
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