| 丛岩， 王瑞林， 丛峰， 邱心培， 史航宇， 刘胡杨.跨临界CO2热泵气体冷却器传热窄点分布模拟研究[J].轻工机械,2025,43(6):32-39 |
| 跨临界CO2热泵气体冷却器传热窄点分布模拟研究 |
| Simulation of Heat Transfer Narrow Point Distribution in Transcritical CO2 Heat Pump Gas Cooler |
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| DOI：10.3969/j.issn.1005 2895.2025.06.005 |
| 中文关键词: CO2热泵 气体冷却器 传热窄点 分布模拟 换热流体温度 |
| 英文关键词:CO2热泵 气体冷却器 传热窄点 分布模拟 换热流体温度 |
| 基金项目:中国石化集团科技项目（YC2413）。 |
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| 摘要点击次数: 12 |
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| 中文摘要: |
| 跨临界CO2热泵气体冷却器内CO2进出口温差大且无变相，这与常规冷却系统差异较大，并且传热过程复杂多变，从而导致在传热过程中无法获取传热参数，无法确定不同压力工况下传热窄点位置与换热流体温度，为此，笔者探究了CO2热泵气体冷却器传热窄点分布模拟方法。建立了跨临界CO2热泵气体冷却器的数学模型，包括压缩机模型和热泵循环模型，通过分布参数法构建了相关计算公式，刻画了气体冷却器内CO2与冷却介质的传热过程并获得了相关参数；在此基础上，对跨临界CO2热泵气体冷却器的传热窄点发生条件与分布进行了模拟分析，先做出相关假设，再根据能量平衡公式，结合典型传热窄点理论推导出传热窄点需满足的公式，进而在不同压力情况下得到对应工况下传热窄点位置和换热流体温度，实现了传热窄点分布模拟。结果显示：该模型获取的CO2质量流量与实际值之间的偏差小于0100 kg/s；且在不同工作压力（6.00~12.00 MPa）下，传热窄点的分布存在显著差异，工作压力升高时传热窄点现象弱化；换热面积为4.0~7.0 m2时，传热窄点温差随面积增大先升高后趋于稳定，验证了该模拟方法对工程实践具有一定的参考价值。 |
| 英文摘要: |
| The temperature difference between the inlet and outlet of CO2 in the gas cooler of the transcritical CO2 heat pump is large and there is no phase change, which is quite different from conventional cooling systems. The process is complex and variable, resulting in the inability to obtain heat transfer parameters and determine the position of the heat transfer narrow point and the temperature of the heat transfer fluid under different pressure conditions during heat transfer process. Therefore, the author explored a simulation method for the narrow point distribution of heat transfer in CO2 heat pump gas coolers. A mathematical model for a transcritical CO2 heat pump gas cooler was established, including a compressor model and a heat pump cycle model. Relevant calculation formulas were constructed using distributed parameter methods to characterize the heat transfer process between CO2 and the cooling medium in the gas cooler and obtain relevant parameters. On this basis, simulation analysis was conducted on the conditions and distribution of heat transfer narrow points in the gas cooler of a transcritical CO2 heat pump. Firstly, the relevant assumptions were made. Then, formulas were derived that need to be satisfied for the occurrence of heat transfer narrow spots based on energy balance and other formulas, combined with typical heat transfer narrow spot theory. Furthermore, the corresponding positions of heat transfer narrow spots and the temperature of heat transfer fluid were obtain under different pressure conditions, and simulation of heat transfer narrow spot distribution was achieved. The results show that the deviation between the CO2 mass flow rate obtained by this model and the actual value is less than 0.100 kg/s.And there are significant differences in the distribution of heat transfer narrow points at different working pressures (6.00~12.00 MPa)，the narrow point phenomenon is weakened when the working pressure increased. When the heat transfer area is in the range of 4.0~7.0 m2, the heat transfer narrow point temperature difference increases first and then tends to be stable with the increase of area. The simulation method has certain reference value for engineering practice. |
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