合理开发利用地热资源推动恩平经济快速发展

本文介绍了恩平市地热资源及开发利用概况，论述了开发地热资源对推动当地经济发展的重要作用，提出开发利用地热资源可持续发展的新构想，充分展现了恩平市通过开发利用地热资源，进一步增强地方经济的综合实力和相关产业的发展，提升了当地旅游产品的品位，改善了投资环境，为恩平社会的改革、发展和稳定做出重要的贡献。     

高岭土在生产橡胶管填料中的应用

本文就高岭土在橡胶管生产中的应用情况作研究探讨。以当地产高岭土替代轻钙原料，在保证质量的前提下降低生产成本。具体从选择的原料、配比、性能实验等几方面来介绍，     

少量H2对预混气着火的影响

对含有两种燃料气（Ｈ２和ＣＨ４）的预混气在热棒前驻点处的着火进行了研究，并与实验结果进行对比。ＣＨ４和水蒸汽首先在加热炉中发生催化重整反应，生成少量Ｈ２，再与空气预混后，在试验段出口处被热棒点燃。实验和计算结果都表明，Ｈ２的高反应率和高扩散性对着火有显著影响，大大降低了着火温度。据此提出了一种新的计算等效总体反应率的方法，同时采用热棒表面处的当地Ｄａｍｋｏｈｌｅｒ数的梯度替代传统的温度梯度作为着火判据。     

太阳能地板辐射采暖系统的实验与数值模拟分析

介绍了上海交通大学太阳能实验室的太阳能地板辐射采暖系统的实验情况，通过实验对该系统在连续循环运行模式下对室内热环境所产生的影响进行了研究，并与非采暖房间进行了比较。同时对整个采暖系统建立了数学模型，通过数值计算得到地板表面温度及室内空气温度动态变化，模拟结果与实验基本吻合。     

垃圾填埋场土壤对氦氮吸附作用的实验研究

高浓度氨氮是城市垃圾渗滤液的重要水质特征之一.通过实验研究土壤对氨氮的吸附作用,得到阜新市垃圾填埋场渗滤液中NH4+-N在当地土壤中的吸附规律为Freundich吸附模式,表明该地土壤对氨氮有较强的吸附净化能力,氨氮在水中的降解也十分迅速.当土壤对氨氮的吸附能力逐渐饱和后,滤液中氨氮对周围土壤和地下水将构成巨大潜在威胁.     

垃圾填埋场土壤对氨氮吸附作用的实验研究

高浓度氨氮是城市垃圾渗滤液的重要水质特征之一。通过实验研究土壤对氨氮的吸附作用,得到阜新市垃圾填埋场渗滤液中NH4+-N在当地土壤中的吸附规律为Freundich吸附模式,表明该地土壤对氨氮有较强的吸附净化能力,氨氮在水中的降解也十分迅速。当土壤对氨氮的吸附能力逐渐饱和后,滤液中氨氮对周围土壤和地下水将构成巨大潜在威胁。     

土壤源热泵在地下工程中空调工况运行实验研究

以华东地区某地下工程中的土壤源热泵系统综合实验平台为研究对象,通过实验研究的方法,对地埋管地源热泵在夏季对地下工程中的典型大余热房间供冷运行特性进行测试。实验结果表明:地埋管地源热泵在华东地区地下工程运行的启动时间约为12 h,其单位埋管放热量为41 W/m。系统运行初期,地下土壤温度上升速度最快,上升幅度随土壤深度的增加而减小。系统运行时间越长,土壤恢复能力越差。测点土壤不同深度温度恢复能力不同,主要受当地地层结构影响。研究成果为土壤源热泵系统在地下工程的应用及运行管理提供参考。     

水的辐射分解过程和产物及其对环境的影响

水受到各种类型的电离辐射后会分解产生高活性自由基和分子产物。这些分解产物有很高的反应性，可通过改变当地的氧化还原条件而影响周围环境。分别分析了水辐解产生的氧化性产物和还原性产物对环境的影响，并对未来的研究工作提出展望。     

电厂直接空冷系统风效应风洞模拟实验研究

探讨了利用风洞模拟实验研究电厂直接空冷系统风效应应满足的相似准则和实验方法,提出了刻画风对空冷凝器效率影响程度的回流率概念;最后,通过一个风洞模拟实验结果的实例说明了外界风速和风向对该具体布置的电厂空冷系统效率的影响规律及在对采用直接空冷系统的电厂进行初步设计前期,结合当地风气象资料,进行适当的风洞模拟的重要意义。     

水平PDMS微通道内气-液弹状流特性观察

对以空气、甘油为工作流体在水平聚二甲基硅氧烷(polydimethylsiloxane,PDMS)微通道内产生的弹状流进行了可视化实验研究.实验结果表明,微通道中弹状流的气柱速度随着体积含气率增大而阶梯状减小.气柱长度在体积含气率小于0.06时几乎不发生变化;当体积含气率大于0.06时,随体积含气率的增大而呈线性增大.气柱间距随体积含气率的变化与气柱长度相反.气柱和微通道壁面之间存在稳定的薄液膜,当地薄液膜压力稳定,气柱流经当地时所造成的压力波动很小;当地静压随体积含气率的增大而减小.     

来流马赫数对叶栅吸力面可压边界层稳定性影响研究

针对叶栅高速流动稳定性预测及转捩问题,采用理论分析与实验测量相接合的方法。首先推导出正交曲线坐标系下三维扰动波的抛物化稳定性方程（PSE）,在风洞实验中,采用叶栅表面压力测孔测量了设计叶栅表面静压分布。根据表面静压分布测量值,通过求解Falkner—Skan方程以获得不同来流马赫数下边界层内速度、压力、密度等参数的分布。将以上结果作为边界层平均流动值,结合数值离散化的正交曲线坐标系非线性抛物化稳定性方程（PSE）对流动的稳定性进行特征值分析。数值离散采用六阶精度差分格式,采用大步长隐格式法求解方程以保证求解的稳定性。计算结果表明本文所选用的实验叶栅由于加工量较小并采用后部加载叶型设计,边界层流动相对稳定。来流马赫数增加对边界层稳定性有微弱影响,会导致流动趋于不稳定。     

Biohydrogen production from autoclaved fruit and vegetable wastes by dry fermentation under thermophilic condition

Dark fermentative hydrogen production from organic waste is an attractive technique that simultaneously treats waste along with generation of renewable fuel. In this study, a relative new technology named dark dry fermentation was tested in a 55-L reactor to treat fruit and vegetable waste (FVW) along with simultaneous generation of biohydrogen. To understand the effect of autoclaving as a pretreatment method on FVW for subsequent biohydrogen production, two independent experiments were performed; one with autoclaved waste (experiment I) and another by using non autoclaved waste (experiment II). From the analyses, it was found that maximum hydrogen % obtained for experiment I was 41% (v/v%) whereas, for experiment II was 21%. In terms of total hydrogen produced, around 30% higher production was observed with experiment I compared to experiment II. The hydrogen yields for experiment I and experiment II were respectively, 27.19 and 20.81 NmL H₂/gVS (VS = volatile solid added), and the metabolites (VFAs) preferentially produced were acetic acid and iso-butyric acid.     

步进梁式连续加热炉总括热吸收率分布规律的实验研究

在某公司步进梁式连续加热炉上进行了钢坯内部温度分布规律的"黑匣子"实验研究,详细地介绍该实验的基本原理和实施方法,得出了总括热吸收率随炉长的分布规律。所做工作对实施加热炉的计算机优化控制奠定了坚实的理论基础。     

油页岩半焦循环流化床热力参数分布特性

在循环流化床燃烧试验台上,进行油页岩与半焦不同掺混比混合燃料燃烧试验,考察一次风率为50％和66.7％2种工况下燃烧室温度和压力分布特性.表明单独燃烧油页岩半焦,炉膛密、稀相区温差较大,炉膛出口温度低,燃烧组织不理想;掺混一定比例油页岩的半焦可以在循环流化床中稳定燃烧,并能保持很好的床温特性,压力分布亦较为合理.一次风...     

半导体热电堆串、并联发电性能及热电堆复现性研究

对半导体热电堆的复现性进行了实验研究。以此为基础进行了热电堆的串联,并联实验,得到了半导体热电堆串联并联的规律,并用有限差分法对热电堆的各项发电性能指标进行了数值计算,为热电发电技术做了有益的探索。     

活塞裙部润滑油膜厚度的计算及试验研究

对活塞裙部润滑油膜厚度进行了仿真计算和试验研究。建立了活塞裙部混合润滑模型,进行了润滑油膜厚度的计算,并介绍了试验方法和试验过程。通过理论计算和试验结果的对比分析。证明了模型的适用性,发现了裙部润滑油膜的一些特点。     

Further progress in the research of fin‐based passive cooling technique for the free‐standing silicon photovoltaic panels

The paper deals with a passive air‐based cooling technique of photovoltaic (PV) panels in operating conditions. Cooling technique is done by specific type of using aluminium fins, and its main purpose is to increase the electrical efficiency of the PV panel. An increase in electrical efficiency can be achieved because of temperature degradation effect, where the PV panel yields less power at higher operating temperatures (the PV panel's efficiency can drop by up to 0.5%/°C). To confirm a cooling technique, a medium‐sized PV system was used in a 2‐month experiment. The experiment was done in realistic operating conditions, and all working parameters were thoroughly measured. After the analysis of the data, no significant raise in electrical efficiency was recorded throughout the experiment. A numerical approach was conducted, based on gained experimental data. Developed numerical model gave explanations of experimental results and provided an insight in heat flow through the PV cell. Later on, developed numerical model was used to propose new cooling variations of the fin‐based technique and to further examine the overall potential of air based passive cooling techniques. It was shown that cooling effect by up to 5°C is a realistic expectation for this technique in described operating conditions.     

Study of heat and moisture transfer in soil with a dry surface layer

Mathematical model for describing simultaneous heat and moisture transfer in the porous soil with a dry surface layer was developed by using the volume-averaging method. Numerical simulation was conducted to investigate water evaporation, transient distributions of temperature and moisture in the porous soil at environmental conditions, which might be useful for agricultural application. In order to validate the mathematical model and numerical method, an experiment was conducted under natural environmental conditions. An additional experiment was conducted in a closed-loop wind tunnel to investigate the temperature effect on soil moisture transport. Theoretical and experimental results indicate that the dry surface layer has an important effect on heat and moisture migration in soil and the influence of temperature on moisture transport in unsaturated soil is significant.     

Experimental Investigation of the Defrosting Process on Domestic Refrigerator Finned Tube Evaporators

Frost formation is an important problem for household refrigerator and air conditioning equipment manufacturers. When frost accumulates on the evaporator surface, it acts as a thermal insulator and reduces heat flow. Therefore, frost negatively affects evaporator performance. The purpose of this study is to decrease energy consumption and increase the efficiency of the defrosting process. In the first part of the experiment, frost formation on a no-frost refrigerator evaporator at real operating conditions was investigated. The ambient temperature was maintained at a constant 23°C. It was observed that when the evaporation temperature reaches –35°C, the frost formation on the evaporator exhibits a rather dense structure that is unlike the needle-type structure observed at higher temperatures. In the second part of the experiment, the defrosting process was observed with an endoscopic camera, and the initial melting points were investigated. The experiment revealed that although the heater density is higher on the lower rows, the frost on the higher rows of the evaporator melts faster. On the theoretical side, we prepared an analytical model that calculates the melting time of the frost on the fin. The experimental and theoretical results are within 5%.     

An energy-independent house combining solar thermal and sky radiation energies

A unique energy-independent house incorporating solar thermal, underground coolness, and sky radiation cooling energies is presented. An experiment on the long-term thermal energy storage (TES) performance was carried out for a model solar house at Tohoku University, and its characteristics, such as heat loss from the reservoir and long-term variation of the water temperature are reported. An experiment on the long-term sky radiation cooling was also performed and the radiative cooling performance of the sky radiator is reported.

It was shown that the proposed system provides almost all the heating, cooling, and domestic hot water (DHW) needs for a standard Japanese home.