变冷

For the aim of saving energy and optimizing control of chilled systems, the performance of VWV systems and characteristics of control systems were analyzed based on the simulation. According to the characteristic of the monitored parameters and controlled variables in VWV systems, three online optimal control strategies were proposed and validated:(1) Optimal strategy for on/off control of chillers according to the ratio of secondary flow rate to primary flow rate.(2) Optimal strategy for the control of secondary pump according to value positions of auto-controlled AHU vales. And (3) Optimal strategy for supply chilled water temperature control of chillers according to valve positions of auto-controlled AHU valves and working status of secondary pump.

为达到节能和优化系统控制的目的，在楼宇空调水系统及其局部控制仿真分析的基础上，针对变流量系统监测点和可调参数较多的特点，提出并验证了3个实时优化控制方案：根据初级和二级冷谋水流量的比率，实时优化多台冷水机组的启／停控制；利用AHU自动控制水阀的阀位信息，实时优化二级水泵的控制；利用AHU自动控制水阀的阀位信息以及二级泵的工作状况，实时优化冷水机组出水温度的控制。

According to evaluation of the thermal, hydraulic, environmental and mechanic characteristics and energy performance of building and VAV air-conditioning system, and evaluation of the control performance of local control loops using the simulator of VAV system, this paper presents five on-line supervisory control strategies for local control loops: on-line optimization of VAV supply air static pressure set-point, on-line optimization of AHU supply air temperature set-point, on-line optimization of on/off set of CAV sub-system, on-line optimization of outdoor air set-point and on-line optimization of chilled water secondary pump pressure set-point.

通过数字仿真器对建筑物及其变风量空调系统的热力、动力、环境和能耗等运行特性的模拟，以及对系统常规采用的下位机控制回路可控性和稳定性等控制特性的研究和分析，本文先从局部的角度开展了系统局部优化的研究。提出并在仿真器上分别实施了VAV送风静压设定的实时优化，AHU送风温度设定的实时优化，CAV子系统开／停的实时优化，新风量设定的实时优化以及二级泵冷媒水供水压差设定的实时优化。

Analyses the causes for insufficiency of the cooling and heating quantity in the air conditioning system terminal.

分析了变流量空调系统末端冷热量不足的原因。

The model of adiabatic spherical to columnar hydrogen bubble growth in large leak sodium water reaction as well as the model of secondary loop pressure propagation with the one dimensional characteristic method are established under one double ended guillotine tube break in the steam generator of liquid metal cooled fast breeder reactor.

研究建立了钠冷快堆蒸汽发生器在单管束发生双端断裂情况下钠水反应中气泡从球形到柱状的变温绝热生长模型，及采用一维特征线方法建立的压力波在快堆二回路中的传播模型。模型中考虑了爆破膜、管壁弹性变形和气蚀的影响。

Warm furnace: If your bedroom is in very cold in the winter, use warm furnace to make indoor and rapid calefacient , it is very important.

暖炉：假如你的卧室在冬天很冷，利用暖炉使室内迅速变暖，是很重要的。

Cooling-curves of different composition after ultrasonic blend were measured with the guide of theory forecast results of the binary system of capric acid and myristic acid. The experiment phase diagram was protracted, eutectic temperature and composition range were discovered of the binary system. Phase change properties of eutectic composition were tested with DSC, the change of the wave shape of eutectic composition after 300 thermocycling was tested with IR.

以癸酸-十四烷酸二元体系的理论预测相图为指导，测量了该体系不同组成超声波混合后的步冷曲线，绘制了该体系的实验相图，判断出最低共熔温度与组成范围；采用DSC测试最低共熔组成的相变性能，采用IR检测最低共熔组成300次热循环前后的波形变化。

With the approach of winter the weather came coder.

随着冬天的接近。天气变得更冷了。

The life by another kind of cold appearance development in front of me, my temperament becomes strange.

生活以另一种冷冽的面目展现在我面前，我脾气变得古怪起来。

Our domestic products remain the same, however, for export we have to produce more cold break and pack in different containers than we are used to, and significantly more in drums.

国内产品的数量保持不变。但对于出口，我们必须生产更多冷破产品、使用不同包装，特别是桶装。

You really have to be cold-blooded. I have always tried to train to my best, with determination.

你真的必须变得冷血，我一直充满信心，努力训练，让自己达到最好的状态。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。