| 1. | The highest heat transfer coefficient for air flowing in the nine 3 - d ift with staggered arrangement fins is no9 tube
过渡流区和层流区的热力性能系数分别为2 . 74和1 . 06 。 |
| 2. | Parameters and the performance coefficient are calculated in two typical work conditions of refrigeration and heating
同时，选定两个典型的制冷和制热工况，计算系统的各项参数及性能系数。 |
| 3. | Comparing this cycle with the evaporation compression refrigerating cycle , the new cycle has more high coefficient of performance ( cop ) under the same condition
该循环与现在冰箱中所采用的蒸气压缩式制冷循环相比较，在条件相同的情况下具有较高的性能系数。 |
| 4. | When the gas engine speed down , the efficiency of gas engine go up , but the cop and the per drop . the descendant value is small and keeps stable in large area
随着转速的降低，发动机效率增大；而系统的性能系数cop和eer虽有下降，但下降不多，且在很大范围内保持不变。 |
| 5. | The cop of mhhp rises with temperature increasing of driving heat source , while the range of temperature upgrading reduces with the temperature increasing of driving heat source
金属氢化物热泵的性能系数随驱动热源温度的升高而增大，但温升幅度随驱动热源温度的升高而减小。 |
| 6. | On the basis of the new model , one of the important parameters , called the optimal operating temperature of the collector of a solar - driven refrigerator , is derived
基于新循环模型，导出太阳能集热器的最佳工作温度这一重要参量。由此获得太阳能制冷系统的最大总性能系数，进而讨论一些有意义的问题。 |
| 7. | The working performances of the refrigerator were presented . it was concluded that the performances of unit tube were excellent , average refrigerating capacity was 66 . 4w and coefficient of performance was 0 . 2
通过对单元管实际运行试验表明该单元管具有良好的制冷性能，平均制冷功率达66 . 4w ，性能系数达到0 . 2 。 |
| 8. | On the basis of these results , the optimal operating temperature of the solar collector and the maximum overall coefficient of performance ( cop ) of the cooling modes of the system are derived
又在此基础上，结合太阳能集热器作为系统的热源，对整个系统的最优综合性能进行分析，得出了最优集热器的运行温度以及在该温度下的系统最优综合效率性能系数。 |
| 9. | Because the improvement of coefficient of performance of the gehp mainly due to the use of waste heat from surroundings , we suggest that we should use energy grade theory to evaluate the performance of heat pump
由于能级平衡理论分析考虑了(火无)的作用，而热泵供暖时其性能系数的提高主要是利用了环境热量，所以建议采用能级平衡理论来分析评价热泵的性能。 |
| 10. | To expand the usage of the system models , the dynamic characteristics between the hfc refrigerant and hcfc refrigerant in the existing system is simulated . the comparison shows that r407c refrigerant is available in the existing equipment , but has lower coefficient of performance
R407c和r22工质系统的对比仿真研究表明，前者可以作为后者的替代工质在现有系统上使用，但性能系数略有降低。 |
