Study on Buildings Heat Reflection

With the acceleration of urbanization,our cities become hotter and hotter.A good control on the heat environment of buildings is useful to improve people's living standard.Considering the phenomenon of "urban heat island",this paper analyzed the influence of a building on other buildings and its surrounding environment due to its form,allocation and thermal character of building materials from the angle of heat reflection,and brought up a proposal to resolve this problem.It opens a new way to improve the thermal environment of a city.     

Study on Heat Transfer Characteristics in Waste Gas of the Exchanger

By the calculation and experiment,analysed the heat transfer characteristies in waste gas of the high temperature exchanger.The results which the reasonable vertical and horizontal distances were obtained,these turned out that the metallic rediation net was the effectve method intensified heat transfer in hot waste gas.The infulence of the velcity and temperature of waste gas on the multiple heat transfer caefficrent of the exchanger was studied by the experiment data.     

Experimental Study of Flow and Heat Transfer in Heat Exchanger with Small Channels

The experimental study of the flow resistance and heat transfer characteristics are conducted for water and ethylene glycol solution (66% Wt) flowing in the heat exchanger with small rectangular microchannels . The heat exchanger having the channels of 0.4 mm in width, 2.0 mm in height, and 20 mm in length is heated by a hearing rod at the bottom surface, the upper and two side surfaces are adiabatic. During experiments, the Reynolds number are ranged from 2 to 2 500. The experimental results show that the flow friction factor decreases and Nusselt number increases with increasing Reynolds number for water and ethylene glycol solution. At a fixed Reynolds number, the Nusselt number for ethylene glycol solution with larger Prandtl number is greater than that for water. Meanwhile, the correlations of flow resistance and heat transfer in the heat exchanger with small channels are obtained for engineering application.     

3种园林植物的耐热性研究

本研究对3种园林植物（矮牵牛、夏菊、藤本月季）的生长状况和耐热性生理指标进行了测定分析研究和指标评价研究。研究结果表明：其可溶性蛋白含量、脯氨酸含量和SOD酶活性与其耐热性呈正相关。在夏季高温高湿条件下,‘普通矮牵牛’（常见品种）不能渡夏的原因是由于耐热性生理活性水平低,藤本月季不利于花芽分化和成花,菊花的开花习性主要受光周期的影响。     

Study on Heat and Moisture Transport Properties of Moist Porous Media

By analyzing heat and mass transport process and transport properties of moist porous media, this paper established a computational model for one dimensional field of heat and moisture transport process. Based on the distinguishing characteristic functions, the inner temperature and humidity distribution of porous media was worked out. With the actual spot measurement, the heat and moisture properties were obtained by nonlinear least square method.     

Control Strategy and Simulation Study on NiMH Battery Quick Charging for Regenerative Braking of HEV

Based on the result of NiMH battery performance experiments, changing trend of maximal temperature and difference in temperature of HEV NiMH battery in different SOC and different charging current is analyzed. Considering the working situation of HEV NiMH battery and the theory of battery quick charging, a control strategy for NiMH battery quick charging is described which adapts to HEV regenerative braking system based on Mascc law. By Modeling and simulating the process of NiMH battery quick charging with this strategy, constant voltage charge method and constant current charge method, validates this control strategy.     

Experimental Study of Ground-source Heat Pump Systems with Horizontal Heat Exchanger

This paper describes the double layer horizontal ground source heat pump systems constructed in 1998 with the buried depth of 0.9 m and 1.8 m. The program of study includes experimental equipments, heat exchanger size, testing meter and methods for data analysis. In addition, the heating and cooling performance at typical days are also illustrated. Among the influencing factors on the performance of the ground source heat pump systems, the parameter of heat exchanger and operation patterns of heat pump systems are analyzed.A heat transfer model has been set up for horizontal heat exchanger.     

Numerical Computation of 3-D Laminar Boundary Layer Equations of Natural Convection Heat Transfer

Coordinate transformation and Box method already succeed in solving boundary layer equations of compelling convection heat transfer,but the solution of natural convection heat transfer has not been informed.For examining the compute accuracy of solving natural convection heat transfer by using this method,this paper numerically computes 3 D laminar boundary layer equations of natural convection heat transfer of stand strip by using this method,the computational results agree with the experimental data from the published paper.The results shows that using this method to solve the equations is feasible.     

Study on Heat Insulation and Use of Passive Evaporated Roof

According to different construction ways and materials, three kinds of roof, that is ,passive evaporated roof with freedom water surface , water stored roof by means of pore material and hygroscopic roof,are introduced in this paper . Meanwhile the theory of heat insulation and energy efficiency on passive evaporation roofs and suitable weather and places to be used are also discussed .The results show that all kinds of passive evaporated roofs have high efficiency in heat insulation because of water's high specific heat and large quantity of absorbed latent heat,and that they can be adopted according to the practical local weather ,natural resource and economical development.     

热激处理对柰李果实贮藏品质的影响

热激处理可用于控制采后果实的病害、腐烂及后熟.对不同温度与时间组合的热激处理与柰李低温贮藏品质之间的关系进行研究.结果表明,40℃、4 h的热激处理对提高柰李抗冷性和保持柰李贮藏品质的效果较好.     

热管管外结冰过程研究

通过对热管制冰传热过程的理论分析,得出影响结冰速率的主要因素是热管的温度与半径.建立了管外结冰一维传热模型,分别以半径和时间为步长对结冰速率进行迭代求解,并利用半径微元法得出了不同温度以及不同圆管半径下的制冰速率曲线.与试验结果相比,所得理论模型能够较好地与其吻合.     

4个油茶品种的半致死温度与耐热性研究

为探明油茶不同品种对高温的适应性差异,从而为高温、强光地区种植油茶提供理论依据,以油茶一年生功能叶片为试验材料,采用电导率法对‘岑软2号’、‘岑软3号’、‘岑软22号’和‘岑软24号’4个油茶品种的耐热性进行研究。结果表明,随着处理温度的升高,4个油茶品种叶片的细胞伤害率增长速度均呈现“慢-快-慢”的趋势,呈典型“S”型曲线,显著性检验均符合Logistic方程。通过计算“S”型曲线拐点求得4个油茶品种的半致死温度都超过了50.0℃,这表明4个品种都有一定的高温适应性,其中‘岑软3号’的半致死温度最高,达到58.5℃,‘岑软2号’的高温半致死温度最低为53.1℃,4个油茶品种耐高温能力由强到弱依次为‘岑软3号’>‘岑软22号’>‘岑软24号’>‘岑软2号’。     

Study on Heat and Mass Transport of Porous Saline Materials

On_site measurement and numerical modeling are made for the interior heat mass distribution. The heat and mass coupling equation system to the porous saline materials in one-dimensional temperature and mass degree field was established. The dynamic distribution features of the materials in moderate temperature and mass degree field were obtained. The result of numerical modeling coincided with that of actual measurement and testified to the numerical model. The study has significance in promoting the interrelated sciences in their studies on the problem of heat and mass transport in porous saline materials.     

Experiment and Simulation on Heat Transfer Efficiency of Double pipe Heat Exchanger for River Water source Heat Pump

The river water source heat pump system is an important technique to utilize renewable energy in Chongqing and heat exchanger can influence overall energy efficiency of system obviously. A test was carried out to study the heat transfer efficiency of double pipe heat exchanger with semicircular reentrant tube. It was found that the heat transfer efficiency would increase while curvature of semicircular reentrant tube rose. And when the ratio of R to r was five, heat transfer efficiency for semicircular reentrant tube would be increased 2.5% than that of straight double pipe heat exchanger. Flow, temperature field and heat transfer process of semicircular reentrant tube were simulated with computational fluid dynamics(CFD) tool to study the heat transfer mechanism. The modified RNG κ ε Turbulence Model was adopted to ensure the accuracy of simulation analysis under the situation of rotary flow and great curvature. Thus, it was indicated that there was obvious secondary flow vertex in reentrant tube. And disturbance of vertex on boundary layer was the main reason for which heat transfer efficiency of double pipe heat exchanger would increase as curvature of semi toroidal reentrant tube rose. Based on the experiment and simulation, the recommended curvature for reentrant tube was proposed with the consideration of sediment in river water and heat transfer efficiency of heat exchanger.     

Study on Solar Heat Control for Buildings in South Area

With the view of building and environment sustainable development, the traditional measures of solar heat control for buildings in the south area were analyzed and their effect on the urban environment was discussed. This paper shows the importance of urban planning and environment planning on solar heat control for buildings.     

The Analysis on the Effect of Cold and Heat Fluid Inlet Temperatures on the Thermodynamic Performance of Heat Exchanger

Based on the exergy analysis method,the thermodynamic performance of high and low temperature heat exchangers is analysed and the calculating expressions of exergy efficiency are given,which can be used to study systematically the effect of cold and heat fluid inlet temperatures on the exergy efficiency of the high and low temperature heat exchangers on the condition of considering pressure exergy loss and not.