| 摘要: |
| 本文对制冷工况下，单级跨临界二氧化碳（CO2）带膨胀机循环、跨临界CO2双级压缩无回热器循环、跨临界CO2双级压缩加回热器循环、跨临界CO2双级压缩一级节流无回热器循环和跨临界CO2双级压缩一级节流加回热器循环五种循环的性能进行了分析比较。结果表明：当膨胀机的效率为60%时，在所规定的蒸发温度范围内（﹣10 ℃~20 ℃），单级跨临界CO2带膨胀机循环的性能要高于其它四种双级压缩循环。当蒸发温度为5 ℃时，只要膨胀机的效率大于32%，单级压缩膨胀机循环的性能就高于其它四种双级压缩循环。对于四种双级压缩循环，前两种循环适用于中高温制冷，且回热循环性能较好；后两种带中间冷却器的循环适宜于中低温制冷，增加回热器后性能反而下降。 |
| 关键词: 膨胀机 CO2 跨临界循环 双级 单级 |
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| Thermodynamic Analysis of One Kind of Single-stage with Expender and Four Kinds of Two-stage Transcritical Carbon Dioxide Refrigeration Cycle |
| Sun Zhili,Ma Yitai |
| (Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce;Institute of Thermal Energy Research, Tianjin University) |
| Abstract: |
| The performances of single-stage transcritical CO2 cycle with expander, transcritical CO2 two-stage cycle without intermediate heat exchanger, transcritical CO2 two-stage cycle with intermediate heat exchanger, transcritical CO2 two-stage & primary throttling cycle without intermediate heat exchanger and transcritical CO2 two-stage & primary throttling cycle with intermediate heat exchanger are analyzed in refrigeration condition. The results show that the single-stage expander cycle outperforms the other options when the expander efficiency is 60% at the given evaporation temperature (﹣10 ℃~20 ℃). When the evaporation temperature is 5 ℃ and the expander efficiency is greater than 32% , the performance of expander cycle is the best. In the other four two-stage cycles, transcritical CO2 two-stage cycle without intermediate heat exchanger and transcritical CO2 two-stage cycle with intermediate heat exchanger are reasonable options in medium and high evaporation temperature, and the performance of using internal heat exchanger in cycle is much better; transcritical CO2 two-stage & primary throttling cycle without intermediate heat exchanger and transcritical CO2 two-stage & primary throttling cycle with intermediate heat exchanger are more applicable to medium and low evaporation temperature. And the using of internal heat exchanger decreases the cycle performance. |
| Key words: expender carbon dioxide transcritical cycle two-stage single-stage |
