在性能系数在低温的温度通常是4- 5 %。
The coefficient of performance at cryogenic temperatures is typically 4-5%.
热泵是一种节能型加热设备，其性能系数远高于普通锅炉装置。
Heat pump is a kind of heating equipment for energy-saving purpose. Its performance coefficient is much higher than common furnace equipment.
使用具有双热源的热泵可以综合各种热源的优点，提高性能系数。
Usage of the double heat source pump can integrate merits of many heat resources to promote its performance.
只有热源温度高于临界温度值时，GAX循环性能系数才能得到提高。
Only when heat reservoir temperature is higher than critical heat reservoir temperature can the performance of GAX cycle be improved.
只有热源温度高于临界温度值时，GAX循环性能系数可以得到提高。
Only when heat reservoir temperature was higher than critical heat reservoir temperature can the performance of GAX cycle be improved.
研究结果表明，在间歇运行工况下，供热性能系数COP平均值为4。
The result shows: under the intermittent operation mode, the average value of COP is 4.
随着冷凝温度和蒸发温度的升高，二级分凝循环的性能系数提高得更多。
When evaporating temperature and condensing temperature increase, the difference of performance between two-step dephlegmation cycle and one-step dephlegmation cycle is greater.
分析该系统在不同工况运行原理的前提下，建立系统性能系数的数学模型。
The mathematics model of coefficient of performance for SWHP-RFH is presented after analyzing the operation principle in different conditions.
采用特殊设计的在低压比下高效运行的压缩机，能够大幅提高系统的性能系数；
The COP of the system also can be increased by using efficient compressor with low compression ratio.
在其它参数确定时，存在最佳压比，可使系统工作性能系数在该条件下达极值。
Where relatively good conditions already exist, they should be utilized to the full, so that work can proceed as quickly as possible.
提出了联合性能系数的概念，分析了利用中高温热泵辅助太阳能空调系统的可行性。
The concept of Associated Coefficient of Performance was presented, and the feasibility of air-conditioning system assisted by medium-high temperature heat pump was analyzed.
通过实验验证，地下水源热泵系统以及地埋管系统均比户型空调机组的性能系数高。
According to the test parameters, the performance of the heat pump is better than the common air conditioning unit.
通过实验，得出了发动机转速与热泵性能系数、发动机热效率的关系曲线，并进行了分析。
Through experiment, the relation figures of engine rotation speed, coefficient of performance of heat pump and engine thermal efficiency are presented and analyzed.
并讨论了循环的发生温度、蒸发温度、吸收温度对循环性能系数、循环倍率和制冷量的影响。
The influences of generation temperature, evaporation temperature, absorption temperature to the coefficient of performance, circular ratio and cooling capacity were also studied.
再生温度和环境空气含湿量对系统制冷量和性能系数的影响较大，而环境空气温度的影响较小；
The regenerating temperature and the humidity ratios of ambient air are two main factors affecting system performance, while the temperature of ambient air functions less.
降低冷却水进口温度和提高其质量流量不仅有利于提高制冷性能系数，而且能降低最佳高压侧压力。
Reducing the inlet temperature of cooling water and increasing its mass flow are favorable to increase refrigerant performance coefficient, and can decrease optimal pressure at high pressure side.
针对高温热泵样机的设计要求，以系统性能系数为目标函数，对循环系统进行了有限定范围的优化。
To meet the designed target of the AHT experiment, we assign the coefficient of performance as the objective function, and optimize the system cycle in a specified range of operating parameters.
根据本发明，提供一种具有高性能系数的热泵、及一种每单位水分去除量仅需消耗少量能量的减湿设备。
The present invention provides a heat pump with a high coefficient of performance and a dehumidifying apparatus that consumes a small amount of energy per amount of moisture removal.
吸收式制冷的优势在于可用低势热源驱动并以环保无公害流体作为工作介质，缺点是性能系数(COP)较低。
Absorption refrigeration can use low thermal potential energy as its power and environment friendly fluids as its working substance.
电机长期工作在低负荷时的效率和功率因数均较低，降低了空调机组的性能系数COP，增加了空调机组的能耗。
The property coefficient COP of air conditioner system reduced and its consumption increased when the electrical motor operated at lower load.
常规跨临界二氧化碳空调循环的性能系数对气体冷却器出口工质温度十分敏感，该温度越低，同等条件下性能越好。
The COP of conventional trans critical carbon dioxide air conditioning cycle depends strongly on the working fluid temperature at the gas cooler outlet.
关系数据库模型和SQL语言的使用必须考虑到企业级性能和可伸缩性。
The relational data model and use of the SQL language allows for enterprise level performance and scalability.
尽管性能有所改进，但是仍然比不上关系数据。
Performance though improving is still not at par with the relational data.
如果您做了性能分析，发现对于XML数据需要大的页宽，而对于关系数据或索引则需要小的页宽，那么可以使用不同的表空间来实现这一点。
If you have done a performance analysis and find that you need a large page size for XML data but a small page size for relational data or indexes, you can use separate table Spaces to achieve this.
在为每个用户分别提供一个数据库连接的情况下，消除管理开销和性能代价的惟一途径是将关系数据库工作从该计算机上转移开。
The only way to eliminate the administrative overhead and performance cost of giving each user a connection to the database is to move the relational database work off the computer.
得到结果之后，只需访问一个关系数据库性能基准站点，查找能够满足需要的系统。
Once performed, you can simply go to a relational database performance benchmark site and find systems in the ballpark range.
无论您是正在调查不同页宽的优点还是 XML性能的其他方面，很可能都要像对于关系数据一样使用DB2快照监视器。
Whether you are investigating the benefit of different page sizes or other aspects of XML performance, chances are you want to use the DB2 snapshot monitor as you would for relational data.
大多数关系数据库通过SQL接口发布性能数据。
Most relational databases publish performance data through an SQL interface.
LOAD实用程序的主要优点可同时用于XML数据和关系数据，例如数据不会被记录并自动使用并行功能提升性能。
The key advantages of the LOAD utility are the same for XML as for relational data, such as the data does not get logged and parallelism is automatically used to increase performance.
如前所述，使用XML数据库的价值(相对于CLOB或分割为关系数据)是改进性能，提高xml精确度，以及简化开发。
As described above, the value of using an XML database (as opposed to CLOBs or shredding into relational data) is increased performance, XML fidelity, and simplified development.
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