| 摘要: |
| 双螺杆制冷压缩机由于其独特的优势已广泛应用于热泵产品中。针对风冷热泵用双螺杆制冷压缩机在反循环除霜过程中的性能特性进行了实验研究，研究结果表明：在进行反循环除霜时对压缩机的冲击比较大，压缩机排气压力急剧下降到0.65MPa才逐渐上升，而吸气压力先直线上升，接着快速下降，甚至到0.1MPa，然后才逐步上升，并和排气压力一样出现了较为强烈的波动；压缩机功率出现了类似排气压力的变化趋势；吸、排气温度的变化则缓和许多，排气温度先是由90℃下降到75℃，然后逐渐上高，最高至100℃左右，然后下降并逐渐趋于稳定，而吸气温度先升高并保持一段时间，然后逐渐下降；系统制热量逐渐下降，随后向循环水提供冷量，随着制冷工况的进行，供冷量先增加后逐渐降低并趋于稳定。对反循环除霜对制冷压缩机影响的研究为提高风冷热泵中压缩机的可靠性提供了实验依据。 |
| 关键词: 反循环除霜 风冷热泵 螺杆制冷压缩机 实验研究 |
| DOI： |
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| Experimental Study on Effect of Reverse Cycle Defrost on the Performance of Screw Refrigeration Compressor |
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Wu Huagen, Xing Ziwen, Shu Pengcheng
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| (School of Energy and Power Engineering, Xi’an Jiaotong University) |
| Abstract: |
| Twin-screw refrigeration compressor has been widely applied because of its unique advantage in air-source heat pump. In this paper, the performance variation of the twin-screw refrigeration compressor during the reverse cycle defrost process has been studied by experiment. The results showed that the twin-screw refrigeration compressor would receive a marked impact because of the reverse cycle defrost behavior of the system. The discharge pressure of compressor would drop sharply to 0.65MPa and then rise gradually during the first half of reverse cycle defrost process, but the suction pressure would rise perpendicularly and then decrease rapidly, even to 0.1MPa, after that it would go up gradually in this period of time. In the second half of reverse cycle defrost process, the discharge pressure and the suction pressure would have a strong oscillation and then tend to steady. During the reverse cycle defrost process, the variation of the discharge temperature and the suction temperature would be slow and lag behind the changing of pressure. The discharge temperature would drop firstly from 90℃ to 75℃, and then up to 100℃, finally, decrease and tend to steady. However, the suction temperature would rise and keep the high temperature for some time, and drop finally. The consumption power of compressor would have the similar experience as the discharge pressure. The heat capacity of this system would decrease and offer cooling capacity to environment. At that time, the frost on the fins would be melted. |
| Key words: reverse cycle defrost air-source heat pump twin-screw refrigeration compressor experimental study |
