| Title |
Experimental Study on the Cooling Performance Improvement of a Two-stage Compression CO2 Cycle |
| Keywords |
CO₂cycle ; 이산화탄소 사이클 ; Intercooler ; 중간냉각기 ; IHX ; internal heat exchanger, 내부열교환기 ; Two-stage compression cycle ; 2단압축 사이클 |
| Abstract |
A CO₂system using the two-stage compression cycle was tested by varying 1st-2nd compressor frequencies in the cooling mode. To improve the cooling performance of the two-stage compression CO₂ cycle, the following cycle options were applied: a basic cycle, a cycle with an intercooler, a cycle with an IHX(internal heat exchanger), and a cycle with an intercooler and IHX. The cycle with the intercooler-IHX showed the highest cooling capacity improvement among the cycle options at all compressor frequencies. The cycle with the intercooler, the cycle with the IHX, and the cycle with the intercooler-IHX improved the cooling COP by 7, 12, and 15%, respectively, over the basic CO₂cycle when the compressor frequencies for the first and second compressors were 50Hz and 30Hz, respectively. In addition, the applications of the selected cycle options enhanced system reliability. |