Cui, C and Wei, X and Song, Y and Yin, X and Cao, F and Wang, X, Experimental study on the effect of compressor frequency on the performance of a combined trans-critical CO2 system, Applied Thermal Engineering, 176 Article 115256. ISSN 1359-4311 (2020) [Refereed Article]
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A trans-critical CO2 heat pump combined system was developed to improve the cycle performance under the working condition of low ambient temperature and high return water temperature. Large amounts of experimental investigation dealing with the variation of the frequency in the trans-critical CO2 combined system were carried out to research into the influence of capacity ratio between the main/auxiliary compressor on the system performance. The experimental results demonstrated the optimal discharge pressure for the both subsystems and that the frequency combination had a huge impact on the system performance. The 90/70 Hz frequency combination achieved the highest COP among all the tested frequency combinations in the ambient temperature of −20, −12 and 0 °C. The system COP was observed to increase by a maximum value of 6.7% under the design condition. The impact of the frequency combination on the optimal system COP would decrease with the augment of ambient temperature.
|Item Type:||Refereed Article|
|Keywords:||CO2 trans-critical system, combined system, frequency combination, space heating|
|Research Group:||Mechanical engineering|
|Research Field:||Energy generation, conversion and storage (excl. chemical and electrical)|
|Objective Group:||Energy storage, distribution and supply|
|Objective Field:||Energy systems and analysis|
|UTAS Author:||Wang, X (Professor Xiaolin Wang)|
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