Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
Please note that all times are shown in the time zone of the conference. The current conference time is: 18th May 2024, 10:54:25pm BST
Session Chair: Dr. Ashvin Dhunput Co-Chair: Yang Lu
Location:BG02
Presentations
Preliminary design and performance evaluation of micro scroll compressor used in refrigeration systems
Shuo Song, Yuanyang Zhao, Qichao Yang, Guangbin Liu, Liansheng Li
Qingdao University of Science and Technology, China
Micro refrigeration systems can be used in many applications. Micro scroll compressors have the potential for application in these refrigeration systems. With its miniaturization, the clearance and geometry parameters have become more influential in the performance of scroll compressors. In this paper, several three-dimensional flow models with different pitches, thicknesses, and leakage clearances are established. These models are designed by the control volume method with R134a as the working fluid. By using the CFD method, the temperature distribution, pressure distribution, and flow characteristics in the working chamber are analyzed. By comparing compressors with different pitches and thicknesses, the effect of pitch and thickness on the volumetric efficiency and isentropic efficiency is obtained. By changing the radial and axial clearances, the change trends of the efficiency are obtained. The results provide a reference for the design of micro scroll compressors.
A Study to Improve Efficiency of a Variable Speed Scroll Compressor
Mathew Pazhathara James, Alex Schmig, Joe Ziolkowski
Trane Technologies
A study using a 1D chamber model was done to improve isentropic efficiency of a variable speed scroll compressor and then testing was conducted to validate. It was noticed in the initial analysis that the economizer location, sizing, and timing optimization gave an efficiency improvement of 0.5% to 2.5% depending on the operating point. Since the economizer was optimized for location, area and timing or activeness, the back flow was reduced, hence the mass flow through the port and efficiency improved. A study with focus on speed resulted in an improvement in weighted efficiency to the tune of 4-6% . Investigating the effect on port delay showed, improvement was on a rising trend as the discharge port delay was increased until around 110 degrees and then efficiency started to decline. The improvements for different operating conditions were in the range of 2%-4%. An improvement in involute start angle also resulted in improvement in efficiency to the tune of 0.7% to 1.3% depending on the operating condition. Changing this parameter affected the structural integrity, hence not adapted.A new compressor was built with new economizer port geometry to understand the effect. The results were promising with variation in efficiency from -0.6% to 5.1% for different operating conditions investigated. Speed sweeps showed there are peak efficiency points, which can be used to decide the speed for operating condition.
