| 摘要: |
| 本文提出了一种新型双节流储液器，该装置可以自动调节系统的制冷剂循环量，使得多功能空调热水器能够在多种模式下稳定运行。依据于COP最大的原则，通过实验确定了多功能空调热水器在夏天单独制冷和制冷兼制热水两种模式下制冷剂的最佳充注量，实验结果表明本装置在室外环境温度为32 ± 1 ℃时，夏季单独制冷、制冷兼制热水两种模式下的最佳充注量分别为6.5 kg、7.5 kg，相应的最大COP分别为3.80、5.88。当制冷剂充注量发生变化时，通过调节系统的节流阀，能够使系统的COP接近于制冷剂最佳充注量所能达到的效果。另外，考察了最佳充注量下节流阀开度对COP、过冷度及过热度的影响，当制冷剂充注量相同，制冷兼制热水模式的COP和制冷量与单独制冷模式的相比，前者更大些。实验结果显示了双节流储液器对制冷剂循环量具有调节作用，达到了节能的效果。 |
| 关键词: 变制冷剂流量系统 节流阀 能效比 双节流储液器 热泵热水器 |
| DOI： |
|
|
| 基金项目: |
|
| Experimental Study on Optimal Refrigerant Charge of Multi-functional Air-conditioning Hot Water Heater |
| Wang Haifeng,Zhang Shoubing,Yuan Huihui,Sun Yajuan,Li Yuduo,Dong Shanshan |
| (School of Chemical Engineering and Energy, Zhengzhou University) |
| Abstract: |
| A new type of double-flow accumulator was developed, which can automatically adjust the amount of circulating refrigerant on the system of multi-functional air-conditioning/hot-water heater so that the system was more stable and efficient under multi-working modes. Based on the principle of maximum COP , the optimal refrigerant charge of the variable refrigerant flow rate system was determined by experiment for the modes of refrigeration only and both refrigeration and hot water in the summer. The tested results showed the optimal amounts of charge for the two modes were 6.5 kg and 7.5 kg respectively, and its maximum COP were 3.80 and 5.88 respectively when the outdoor temperature was 32 ± 1℃. When the refrigerant charge changes, by controlling the throttle valve, the COP could be close to the case with the optimal refrigerant charge. Moreover, a series of performance parameters, such as COP, the refrigerating capacity, the degree of subcooling and superheat at optimal refrigerant charge, were investigated with the opening degree of the throttle valve. The results show that when refrigerant charge is the same, the COP and the refrigerating capacity of both refrigeration and hot water mode is bigger compared with refrigeration only mode. Experimental results also show that the double throttling accumulator plays an important role in regulating the refrigerant cycle and saving energy. |
| Key words: variable refrigerant flow rate throttle valve energy efficiency ratio double-flow accumulator heat pump water heater |
