| Abstract [eng] |
The control of compressor speed in refrigeration systems is a crucial component of HVAC system technology, enabling the optimization of energy consumption and the enhancement of overall system performance. Dynamic adjustment of compressor motor speed allows for the compressor’s operation to be tailored to the current cooling demand, thereby conserving energy used for refrigeration. Effective speed control of the compressor leads to improved system efficiency, which manifests as more stable temperature regulation and reduced noise production from the compressor. Additionally, managing compressor speed not only prolongs the equipment’s operational lifespan, but also decreases the costs associated with system maintenance. This research discusses the various types of compressors available in the market, as well as commonly used control algorithms. The objective of this study is to develop a control algorithm for a laboratory cooling system’s compressor to enhance system efficiency. To formulate this algorithm, tests are conducted to examine the performance of compressor at different, predefined constant speeds. The findings from the tests reveal a correlation between the designed speed, the temperature of refrigerated volume and the compressor’s efficiency. Utilizing this established relation, a compressor speed control algorithm is formulated. Subsequent application of this control algorithm and further analysis of compressor function have shown reductions in energy consumption ranging from 15–40 %, and increase in the efficiency by 8–20 % compared to the operations carried out at fixed speeds. Moreover, within the utilized temperature ranges of the study, cooling times were improved by 11-79 % compared to the cases of stable speed operations. |
