| Title |
Performance Variation with Length of Internal Heat Exchanger in CO2 Cooling Cycle Using an Ejector |
| Authors |
강변(Byun Kang) ; 조홍현(HongHyun Cho) |
| DOI |
http://dx.doi.org/10.6110 /KJACR.2012.24.2.147 |
| Keywords |
이산화탄소 ; 초임계 시스템 ; 이젝터 ; 내부열교환기 Carbon dioxide ; Transcritical system ; Ejector ; Internal heat exchanger |
| Abstract |
Recently, many researchers have studied the performance of the transcritical CO2 refrigeration cycle in order to improve the system efficiency. In this study, the length of IHX in the CO2 ejector cycle was varied so as to evaluate the performance improvement. As a result, compressor work and cooling capacity was increased by 3% and 5% as the length of internal heat exchanger was changed from 3 m to 15 m. The best COP was appeared at internal heat exchanger length of 12 m, and it was 3.01. Besides, the length of internal heat exchanger has a big effect to pressure lift ratio and entrainment ratio in the ejector CO2 cycle and it may be changed with operating conditions and system specifications. |