关于早期专项训练若干问题的调查与研究

采用文献研究、问卷调查、逻辑分析等方法,对我国早期专项化训练的一些理论与实践问题进行了初步探讨;对早期专项化训练的项目、范围和年龄界限进行了重新认识;讨论了早期专项化训练的目标、任务、内容、方法、手段等问题     

中低温传导型孔隙介质地热田回灌试验研究

以天津武清地热田为例 ,对传导型孔隙介质地热田回灌技术进行研究 .武清地热田主要开采层为第三系馆陶组砂岩 ,热储层温度 76～ 86℃ .根据水动力模型的预测 ,热储水位降深将在近期趋于稳定 .在无回灌条件下 ,如以最大开采量持续开采 ,5年内水位将下降到 10 5 m.回灌可提高孔隙 /裂隙热储中热量的开采 ,减缓水位下降幅度 .此外 ,还计算了回灌过程中不同情况下冷锋面的运移速度 .为查明开采井和回灌井之间的水力联系 ,探讨了示踪剂试验的可行性     

Numerical study on heat transfer enhancement for use of corrugated,nodal and horizontal grain tubes

With isopentane as working fluid, the heat transfer performances for corrugated, nodal and horizontal grain tubes are simulated. The structural parameters of the three kinds of tubes are compared with those of the plain tube. The numerical results using computational fluid dynamics are validated with theoretical values. For the corrugated, nodal and horizontal grain tubes, the heat transfer enhancements(HTEs) are 2.31—2.53, 1.18—1.86 and 1.02—1.31 times of those of the plain tube, respectively. However, the improved HTEs are at the expense of pressure losses. The drag coefficients are 6.10—7.09, 2.06—11.03 and 0.53—1.83 higher, respectively. From the viewpoint of comprehensive heat transfer factor, the corrugated tube is recommended for engineering applications, followed by the horizontal grain tube.     

从“来”字的误用想到的

现行小学语文课本第六册(上海、天津等四省市教材编写组编写,上海教育出版社出版)《会摇尾巴的狼》这篇课文中说,狼在陷阱里和陷阱外边的老山羊说:“只要你伸下一条腿来,我就得救了。”又说:“我一出来马上就报答你……。”这句话里的“来”字用错了。     

Arrangement strategy of ground heat exchanger with groundwater

The orientation strategy of side pipe and the heat transfer performance of six ground heat exchangers(GHEs) were optimized by numerical simulation,with soil being treated as a porous medium.An experiment on the heat transfer of four GHEs was carried out in 2010.Results indicate that the velocity field is disturbed by GHEs.The optimal orientation strategy of side pipe is that the upward pipe is located upstream and the downward pipe downstream.The space between GHEs should be appropriately adjusted,depending on the direction and flow velocity.Groups of GHEs should be installed perpendicular to the mainstream in a single row,but if the acreage does not meet the requirements,GHEs should be installed in staggered multiple rows.Fewer GHEs parallel to the mainstream strengthen the heat transfer.Moreover,numerical results agree well with the test data,with the maximum relative error being less than 7.7%.     

Thermal Response Test by Improved Test Rig with Heating or Cooling Soil简

An improved test rig providing both the heat and cold source was used to perform thermal response test(TRT), and the line source model was used for data analysis. The principle of determining the temperature difference between the inlet and outlet of test well can keep the heating or cooling rate constant, along with a reduced size of test rig. Among the influencial factors of the line source model, the temperature difference was determined as the most important, which agreed with the test results. When the gravel was taken as the backfill material, the soil thermal conductivities of heating and cooling at the test place were 1.883 W/(m·K) and 1.754 W/(m·K), respectively, and the deviation of TRT between heating and cooling soil was 6.8%. In the case of fine sand, the thermal conductivities of heating and cooling were 1.541 W/(m·K) and 1.486 W/(m·K), respectively, and the corresponding deviation was 6%. It was also concluded that different velocities of water had less influence on TRT than the temperature difference.     

Parametric optimization of organic Rankine cycle with R245fa/R601a as working fluid

In order to select the appropriate working fluids and optimize parameters for medium-temperature geothermally-powered organic Rankine cycle(ORC), R245 fa is mixed with R601 a at geothermal water temperature of 110 ℃. Based on thermodynamics, the characteristics of mixture and its influence on the performance of ORC under different evaporating temperatures and composition proportions are analyzed. Results show that the zeotropic mixture R245fa/R601a(0.4/0.6) has the highest performance. When the evaporating temperature reaches 67 ℃, the outlet temperature of geothermal water is 61 ℃, the net power output is the highest and the thermal efficiency is about 9%.     

论天津体院教师队伍建设

通过对天津体院教师队伍的工作状况、结构状况、（年龄结构、学历结构、职称结构、学缘结构、专业结构及来源结构）、流动状况、待遇状况及中青年教师状况的调查,认为我院教师队伍的总体状况是好的。但教师队伍的结构尚不合理;教师的待遇状况不尽如人意;教学骨干和学科带头人群体老化问题日显突出;教师队伍的流失情况虽不严重,但教师队伍中的潜在和隐性流失情况对稳定教师队伍存在潜在的威胁。最后提出了加强我院教师队伍建设的对策。     

Experimental investigation on system with combination of ground-source heat pump and solar collector

This paper presents the heating performance and energy distribution of a system with the combination of ground-source heat pump and solar collector or a solar-assisted ground-source heat pump system (SAGSHPS) by calculation and experiment.The results show that the average absolute error is less than 0.6 ℃ and the relative error is less than 5% under the pulse load when the analytical solution to the 2-D solid cylindrical source model is used for the SAGSHPS.The coefficient of performance (COP) of the SAGSHPS is 2.95-4.70.The average fluid temperature in the borehole heat exchanger can increase by 3 ℃ with the assistance of solar collector,which will improve the COP of the heat pump by approximately 10% from the experimental data.The energy contributions to the total heating load of soil,electricity and solar are 56.30%,36.87% and 6.83%,respectively.     

团泊地区地热资源评价与数值模拟

讨论了地热田非均质各向异性传热传质的特点及地下热储资源补给的可能性 .采用集参模型和分布参数模型评价方法 ,通过有限元及有限差分两种离散计算方法建立数学模型 ,进行数值模拟研究 ,成功预测了团泊风景区地热集中开采区域的热储开发趋势 ,结果表明开采寿命约为 15年 .