| 摘要: |
| 低温空气源热泵产品普遍采用中间补气技术解决空气源低温多联机在低温环境中能力衰减严重的问题。本文研究了低温多联机中间补气增焓系统，通过多联机性能实验测试对系统压力、温度等参数进行测试，并对测试的数据进行拟合分析，确定了补气增焓技术的控制要素：流经室外换热器的制热主路制冷剂的质量流量与状态是多联机补气增焓控制中的主要因素；中间补气增焓支路制冷剂干度越接近1，制热效果越好，因此保证压缩机补气口制冷剂饱和蒸气态可以作为低温多联机制热控制的重要参数；而由吸排气压力计算的理论最佳增焓压力不具有普适性，不能作为低温多联机补气增焓的有效输入项参数控制。 |
| 关键词: 多联机 补气增焓 补气压力 过热度 制冷剂流量 |
| DOI： |
| 投稿时间：2020-05-07 修订日期：2020-11-03
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| 基金项目:广东省中山市重大科技计划项目 （191018112628075）和江苏省南京工程学院校级基金项目（3544113220004）资助。 |
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| Experimental Investigation on Heating Performance of Variable Refrigerant Flow System with Vapor Injection at Low Ambient Temperature |
| Song Peigang,Yu Pengfei,Dai Wenjie,Yan Huazhou |
| (Guangdong TCL Intelligent & Ventilating Equipment Co. LTD.;College of Energy and Power Engineering, Nanjing Institute of Technology) |
| Abstract: |
| Vapor injection technology is widely used in variable refrigerant flow (VRF) system to solve the problem of severe decrease of capacity in low-temperature environments. In this study, the key parameters such as pressure, temperature etc. and performance of a VRF system were tested and analyzed to get the control strategy of VRF system at low ambient temperature. The results show that the mass flow and state of the refrigerant flowing through the heat exchanger of outdoor unit are the main factors in the control of vapor injection for the performance of VRF system at low ambient environment. The better heating effect will be observed when the quality x of the refrigerant in the inject circuit is closer to 1. Therefore, the saturated vapor state of the refrigerant at the compressor supplementary port can be used as an important parameter for the thermal control of the VRF system at low ambient environment. However, the theoretical optimal pressure calculated by the suction and discharge pressure is not universal, cannot be used as an effective input parameter control for the low-temperature VRF system with vapor injection. |
| Key words: variable refrigerant flow system vapor injection vapor injection pressure superheating degree refrigerant flow rate |
