To meet the diversified demand of power and cooling for the distributed energy system, this paper proposes two combined cooling and power (CCP) systems combining the supercritical carbon dioxide cycles with a carbon dioxide ejector refrigeration cycle, which can switch between full power mode (Mode-P), combined cooling and power mode (Mode-PR), and full refrigeration mode (Mode-R) according to the energy demands of users. In the proposed CCP systems, the recompression cycle and modified dual-stage compression cycle are used to replace the regenerative cycle and basic dual-stage compression cycle in two reference systems respectively. The mathematical models of systems are established and verified. Detailed parametric analysis is conducted to investigate the effects of key parameters on the performances of proposed systems and reference systems. Moreover, the modified systems and reference systems are optimized and compared at three modes. Multi-mode analysis is also applied to study the ability of the four CCP systems to convert power into cooling. Finally, detailed exergy analysis and thermoeconomic analysis are performed for the optimal system. The results show that the modified systems can achieve higher exergy efficiency by recovering partial waste heat before the pre-cooler. Under the refrigeration condition (the evaporation temperature is 0 ℃), the exergy efficiencies of the modified single-stage compression (M−S) system are 13.71% and 14.08% higher than those of the reference system at Mode-P and Mode-R, respectively. The cooling capacities of the systems at Mode-PR and Mode-R are positively correlated with their power outputs at Mode-P. The M−S system has the best multi-mode performance owing to its highest exergy efficiency (64.01%) at Mode-P, minimal energy loss at Mode-PR, and the maximum cooling capacity to heat input ratio (1.714 at 0 ℃ and 0.964 at −20 ℃) at Mode-R. Under the freezing condition (the evaporation temperature is −20 ℃), the single-stage compression systems generally perform better than the dual-stage compression systems. During the process of switching from Mode-P to Mode-R, the total product unit cost of the M−S system increases from 12.24 $·GJ⁻¹ to 44.74 $·GJ⁻¹ under the refrigeration condition and from 12.24 $·GJ⁻¹ to 38.15 $·GJ⁻¹ under the freezing condition.

为满足分布式能源系统对动力和制冷的多样化需求，本文提出了两种结合超临界二氧化碳循环和二氧化碳喷射器制冷循环的冷动力联合（CCP）系统，可在全功率模式（Mode -P)、冷电联合模式（Mode-PR）和全制冷模式（Mode-R），可根据用户的能源需求而定。在提出的 CCP 系统中，再压缩循环和改进的双级压缩循环分别用于替代两个参考系统中的再生循环和基本双级压缩循环。建立并验证了系统的数学模型。进行详细的参数分析以研究关键参数对建议系统和参考系统性能的影响。此外，修改后的系统和参考系统在三种模式下进行了优化和比较。还应用多模式分析来研究四个 CCP 系统将功率转换为冷却的能力。最后，对最优系统进行详细的火用分析和热经济分析。结果表明，改进后的系统可以通过在预冷器之前回收部分废热来实现更高的火用效率。在制冷条件下（蒸发温度为 0 ℃），改进后的单级压缩（M-S）系统在 Mode-P 和 Mode-R 下的火用效率分别比参考系统高 13.71% 和 14.08% ， 分别。模式-PR 和模式-R 下系统的冷却能力与其在模式-P 下的功率输出呈正相关。M-S 系统在 Mode-P 时具有最高的火用效率（64.01%），在 Mode-PR 时能量损失最小，以及最大的冷热输入比（1.714 at 0 ℃ and 0.964 at -20 ℃) 在 Mode-R。在冷冻条件下（蒸发温度为-20℃），单级压缩系统的性能一般优于双级压缩系统。在从 Mode-P 切换到 Mode-R 的过程中，M−S 系统的总产品单位成本从 12.24 $·GJ 增加 单级压缩系统的性能通常优于双级压缩系统。在从 Mode-P 切换到 Mode-R 的过程中，M−S 系统的总产品单位成本从 12.24 $·GJ 增加 单级压缩系统的性能通常优于双级压缩系统。在从 Mode-P 切换到 Mode-R 的过程中，M−S 系统的总产品单位成本从 12.24 $·GJ 增加^-1到 44.74 $·GJ ^-1在冷藏条件下和从 12.24 $·GJ ^-1到 38.15 $·GJ ^-1在冷冻条件下。