共查询到18条相似文献,搜索用时 156 毫秒
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介绍了一种小型蒸发装置除雾装置的设计方法,结合放射性废水处理的设计理论和方法,自行设计了一种小型的放射性废水蒸发处理装置除雾装置,以解决负压蒸发操作处理废水时雾沫夹带问题.试验结果表明设计有除雾装置的蒸发器出水水质满足国家标准,有效的控制了蒸发过程中的雾沫夹带问题. 相似文献
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MHD(Multistage humidification-dehumidification)低温蒸发技术,可以用太阳能、余热或废热为热源,低成本地处理高浓度污水,且蒸发温度低、节能效果显著。其中的填料蒸发器是一个重要部件,其特点是传热传质效率高、结构紧凑。本文基于非稳态三维气液流动,研究了填料蒸发器内的蒸发过程,包括液相颗粒质量变化、温度分布以及水蒸气浓度分布,揭示了填料蒸发器内废水原液蒸发及对干燥空气加湿的规律,为MHD低温蒸发系统填料蒸发器的结构性能优化以及蒸发系统整体性能计算提供了依据。 相似文献
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热管废热回收蒸发器在浊水余热回收中的应用 总被引:1,自引:1,他引:0
针对污水的特性,为避免生活污水与热泵工质R22产生交叉污染,从而导致系统不能正常运行的可能性,提出在污水与热泵系统工质R22之间采用一个热管换热器,得出在系统增加了一个热管换热器的情况下,污水流量一定时,热泵制热量,性能系数COP值,热泵系统R22工质蒸发温度,污水废热回收热量随污水进口温度的增大而增大,其中热泵工质蒸发温度的增幅最大,达到65.79%,废热回收热量的增幅最小,为6.8%,污水入口温度一定时,热泵制热量,性能系数COP值,热泵工质蒸发温度,废水回收热量随着污水流量的升高而升高,但是热泵工质蒸发温度的和性能系数COP值的增幅减少,热泵制热量,热管工质蒸发温度以及废水回收热量的增幅缓慢增加. 相似文献
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提出了一种空气/水复合热源热泵型空调器,冬夏使用中在采用空气作为热源同时可以回收利用家庭废水的低品位热能。运用热力学原理研究了夏季在不同新风比、不同室内温度时机组制冷系数随冷凝水回收后温度变化而变化情况;分析了机组冬季制热回收废水缓解室外换热器结霜的机理,研究了采用R22和R407C工质时回气温度和蒸发压力随回收废水量和出水温度的变化。结果表明,采用空气/水作为热泵型空调器的复合热源,能够提高机组夏季制冷循环的制冷系数,冬季制热时有利于延缓室外换热器结霜、改善冬季制热性能。 相似文献
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秦山第二核电厂大修期间化学废水接收量较大,从而蒸发处理后产生了大量浓缩液。为了减少放射性废物的排放量,减轻对环境的影响,本文通过查找文献、理论分析以及对一回路低低水位排水过程及充水排气过程排放工艺贮槽的排水量进行计算验证,试图减少化学废水的接收量,并提出改进性意见。文中提及对工艺贮槽除盐回路的改造、化学贮槽对工艺贮槽的备用及未来富集硼在核电厂的应用,具有一定参考作用。 相似文献
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Seong-Yeon Yoo Jin-Hyuck Kim Myoung-Seok Jie 《Journal of Mechanical Science and Technology》2010,24(4):887-892
When circulated air passes through the cooling coil in an air-conditioning system, the air is over-cooled to eliminate the
moisture and decrease the temperature. The cooled air is then reheated to recover the temperature. The purpose of the present
study was to evaluate the performance of a cooling/reheating system with regard to both cooling and reheating energy savings
affected by exchanging heat between the cooled air and the reheated air with a compact heat exchanger. The thermal and dehumidification
behaviors of the system were evaluated experimentally and then compared with simulation data. The results show that the energy
saving rate was as high as 50% under the present experimental conditions and was affected by the face velocity of the heat
exchanger, the inlet temperature, the inlet humidity ratio, and the effectiveness of heat exchanger. Furthermore, the experimental
data were found to be in fairly good agreement with the simulation data. 相似文献
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提出了空气源蓄热式土壤源热泵系统,该系统将夏季自然空气热量蓄存于土壤中,冬季再由热泵取出供热,即实现了可再生能源的移季利用又能解决严寒地区应用土壤源热泵引起的土壤全年总取热量与总排热量失衡的问题.为研究系统运行特性,建立了系统全年仿真模型,并以哈尔滨某建筑为例进行了模拟计算.结果表明,经移季蓄热埋管管壁处土壤温度升高了3.2℃,显著改善了热泵运行条件,使得供暖保证率达到了99.5%,热泵性能系数为3.99,系统全年供热性能系数为2.56.证明了该系统在严寒地区应用是可行的. 相似文献
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准确的实时冷负荷是空调运行过程节能的基础,传统的冷负荷计算方法复杂费时,无法满足实时调控的要求。软测量是一种先进的方法,但由于房间冷负荷无法直接测量,因此基于样本数据无法实现软测量模型的参数辨识。针对冷负荷软测量技术的这一瓶颈问题,通过冷负荷的机理分析与建筑能耗仿真软件模拟数据的分析,发现冷负荷在频域中集中分布在以一天为周期的频率点及其二次三次谐波上,利用冷负荷这一频域特性本文提出了一种基于房间温度响应的冷负荷实时软测量技术。该方法通过频域分解,选择不含冷负荷的频域段进行蓄热过程的参数辨识,从而避开了辨识过程对无法实测的实时冷负荷真实值的依赖。基于可测的空调供冷量、房间温度和辨识得到的蓄热系数,就可以利用房间热平衡方程进行冷负荷建模并实现其软测量。通过在建筑能耗仿真平台上的仿真及实际房间的实测实验表明,该方法可以快速有效地实现房间实时冷负荷的软测量,相对于基于机理分析或软件计算的方法更具实用性,同时本方法也为其他难测变量的软测量技术提供了借鉴思路。 相似文献
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Mohammad Hossein Jahangir Seyed Amirodin Sadrnejad 《Journal of Mechanical Science and Technology》2012,26(11):3661-3672
After a spacious research and consideration on various approaches of thermal coupled formulations in porous media, a new mathematical form of coupled heat, moisture, and air transfer in unsaturated soil is proposed upon taking the effect of combined volumetric moisture content and temperature gradients and air pressure changes. In this matter, in the convective flows through the unsaturated heated soil, the effects of sensible and latent heat of vapor are also composed with the water and dry air fluxes. Thus in this aspect, some new material parameters are defined for the derived equations, which are related to thermodynamic specifications of soil and the soil-water characteristic curve. After that, the application of the model is presented with a numerical example of a ground heat exchanger which is buried in the earth vertically. It could be considered as an interior heating source which operates in extracting saved energy from the earth or emitting heat to the ground. Then, by using some thermal graphs, the influence of the different operating ratio is investigated which are compared with the full operating mode at all times. Meanwhile, the mode1 is verified by comparing its results against those established by other researchers. By the results, it was found that the volumetric water content and specific heat capacity are the main factors could be effective to generate directly the thermal and isothermal diffusivities and conductivities in terms of the thermodynamic properties. 相似文献