| 1. | The future research on the frost and defrost of ashp is prospected at last
最后对本研究作了总结和和未来的研究方向作了展望。 |
| 2. | But the frost , which is accumulated on the evaporator for certain surrounding conditions , can degrade the performance of ashp and the periodical defrost is necessitated
然而机组的本身特点决定了在一定环境下必然存在结霜的现象，因此需要周期性地除霜。 |
| 3. | Simulating results show that the novel defrost method can be adaptive depending on the surrounding conditions and the situation of ashp , so is a guideline to the intelligent defrost of ashp
为了进一步拓宽仿真模型的应用，还研究了空气源热泵机组工质替换成新型工质后，系统动态特性的变化情况。 |
| 4. | Air - source heat pump ( ashp ) has many unique advantages , such as high efficiency , convenient operation and no pollution to applying areas etc . , so has been broadly used in china , especially in central south area and lack - of - water area
空气源热泵机组具有高效节能、使用方便和不污染使用地区环境的特点，在我国具有广阔的发展空间。 |
| 5. | The good comparisons between simulations and experiments show that the system simulation model is valid in the research on the dynamic characteristics of ashp and the mentioned method of calculation is available in the simulation
仿真结果和实验结果的比较表明本研究所提出仿真模型能反映空气源热泵机组结霜和除霜过程中系统的本质特性，仿真计算的实践表明所提出的仿真计算方法是行之有效的。 |
| 6. | On the basis of simulation and experiment , the dynamic characteristic of frosting and defrosting of ashp is studied . a set of simple equations is put forward to model the reverse cycle procedure of defrost and is put into the practice to simulate the dynamic characteristics of frosting and defrosting of ashp
在仿真模型研究中，提出了一个简单的可以用来模拟四通阀换向后系统高低压平衡和系统循环重新建立的过程，并将这一模型应用到机组动态特性研究。 |
| 7. | For the reason that the defrost methods of ashp can not satisfied the need of owners , a novel adaptive defrost method is brought forward , which is grounded on the modern modeling techniques and the change rate of tube - fine temperatures . the method integrates the surrounding conditions and the response of the ashp during operation
针对目前空气源热泵机组除霜过程中存在的问题，提出了一种基于现代仿真技术和管翅片温度变化率为基础的自适用控制技术，并探讨了这种技术的如何实现问题，为实现真正的按需除霜提供了理论上的依据。 |
| 8. | An array of benefits is provided with the application of the integrated system , such as high cop & spf , energy saving , small fluctuation with the ambient temperature , improving the conflict between the fresh air supply and energy consumption and etc . 3 . a comparison has been made on ground - source heat pump ( gshp ) with the air - source heat pump ( ashp )
地源热泵联合辐射地板对房间进行冷暖联供，既具有地源热泵季节性平均性能系数高、土壤蓄热能力强、随环境温度波动小等优点，且能改善空气源热泵系统新风供给量与耗能之间的矛盾关系。 |
| 9. | To improve the performance of ashp , an improved ashp system is presented . different from the original system , the new one can control the refrigerant flow rate by the sub - cooling of condenser and adjust the sup - heating of the compressor inlet vapor by the heater in accumulator . the simulation shows the new system not only has better dynamic characteristic of frost and defrost of ashp , but also has higher coefficient of performance
为改善空气源热泵机组的结霜除霜动态性能，提出了一种利用冷凝器过冷度来调节制冷剂流量，在气液分离器里增加电热装置保持压缩机进口过热度的改进型系统，结果表明这种改进型系统不但可以改善系统的运行性能，同时能改善系统运行的经济性，为机组的技术升级和产品更新提供了一个新的途径。 |
