Correction to: Experimental performance evaluation of an impinging jet with fins type solar air heater

Environmental Science and Pollution Research - A Correction to this paper has been published: https://doi.org/10.1007/s11356-021-12458-z     

Experimental investigation and optimization of dimple-roughened impinging jet solar air collector using a novel AHP-MABAC approach

Environmental Science and Pollution Research - The effect of the flow and geometric parameters of a dimple-roughened absorber plate on the enactment of solar air collectors (SACs) with air-impinged...     

Environmental,economic, and performance assessment of solar air heater with inclined and winglet baffle

Environmental Science and Pollution Research - To investigate the solar air heater’s (SAH) effectiveness, experiments are conducted using flat plate and artificially roughened plate in terms...     

低压供气式射流器工业化性能研究

简要介绍了低压供气式射流器的工作原理和作用,对其在氧化沟污水处理工艺中的氧利用率和动力效率等因素做了测试和分析,比较了不同水深对充氧性能的影响。结果表明,低压供气式射流曝气器氧利用率达23.17%,动力效率达2.43 kg O2/(kW.h),优于其他形式的曝气设备,可以有效降低能耗。     

Effect of fabricated V-rib roughness experimentally investigated in a rectangular channel of solar air heater: a comprehensive review

Environmental Science and Pollution Research - Solar power is one of the main sources of renewable energy which helps for protecting the environmental and reducing pollution. Technologies and...     

Experimental studies of thermal performance of an evacuated tube heat pipe solar collector in Polish climatic conditions

Environmental Science and Pollution Research - This work presents the results of experimental studies on the energy performance of an evacuated solar collector, heat pipe type, consisting of 24...     

Energy,exergy, and economic analysis of solar still using coal cylinder fins: an experimental study

Environmental Science and Pollution Research - The phenomenon of drinking water scarcity has turned into the foremost issue that the world’s populace is facing today. The Algerian desert...     

空气净化器检测用环境试验舱研制及性能评价

研制一种大型环境试验舱,该舱整体构造主要由内舱、外舱、空气净化系统、污染源发生装置和空气采样系统组成。其中,内舱为测试舱主体部分,体积为30 m3。对舱的性能进行评价测试,结果表明:温度和相对湿度的偏差分别为δT≤2.5℃和δRH≤5%;环境舱内外压差在0～5 Pa时,舱体泄漏量为0.03～1.02 m3/h;清洗后,舱内单项污染物本底浓度小于20μg/m3,总挥发性有机物(TVOC)小于90μg/m3;以质量分数为37%的甲醛溶液作代表性污染物,4种投放量下回收率分别为86.6%、83.4%、82.9%和81.5%;舱内温度为21℃,相对湿度为40%时,甲醛、苯、甲苯等3种污染物自衰减分别为6.7%、8.9%和4.7%。实验结果表明该试验舱应用性能良好,可用于检测空气净化器性能及净化效率。     

Design and performance evaluation of a photocatalytic reactor for indoor air disinfection

Environmental Science and Pollution Research - Since COVID-19 pandemic, indoor air quality control has become a priority, and the development of air purification devices effective for disinfecting...     

Analysis of a solar still with photovoltaic modules and electrical heater - Energy and exergy approach

The availability of drinkable water, along with food and air, is a fundamental human necessity. Because of the presence of higher amounts of salt and pollution, direct use of water from sources such as lakes, sea, rivers, and subsurface water reservoirs is not normally suggested. Solar is still a basic technology that can use solar energy to transform accessible waste or brackish water into drinkable water. Exergy analysis is a strong inferential technique for evaluating the performance of thermal systems. Exergy is becoming more popular as a predictive tool for analysis, and there is a rising interest in using it. In this paper, performance analysis on the aspect of energy and exergy from the proposed solar still (PSS) (conventional solar still with the photovoltaic modules-AC heater) was analyzed on three different water depths (W_d) conditions (1, 2, and 3 cm). Using a solar still with an electric heater, the daily potable water production was found as 8.54, 6.37, and 4.43 kg, for the variations in water depth (W_d) of 1, 2, and 3 cm respectively. The energy and exergy efficiency of the PSS at the W_d of 1, 2, and 3 cm were 75.67, 51.45, and 37.21% and 5.08, 2.29, and 1.03%, respectively. At 1 cm W_d, PSS produced the maximum freshwater yield as compared to the other two water depths. When the W_d is increased from 1 to 2 cm and from 1 to 3 cm, the yield is decreased up to 27.3 and 52.7%, respectively. Similarly, the energy and exergy efficiency is decreased up to 36.8 and 53.2% and 50.4 and 80.6%, respectively. The water cost of the modified solar still is calculated as 0.028 $/kg for the least water thickness.

     

Performance improvement of modified tubular solar still by employing vertical and inclined pin fins and external condenser: an experimental study

Environmental Science and Pollution Research - The current experimental work aims to improve an accumulative yield of tubular solar distillers. This was achieved by utilizing the pin fins and...     

液-液射流搅拌提高热水解污泥混合性能分析

在厌氧消化反应器中,机械搅拌是广为应用的搅拌方式,但机械搅拌在运行过程中存在设备维修困难、能耗高等问题。基于前期的研究,利用Ansys 17.2软件平台,构建3 000 m3液-液射流搅拌厌氧消化反应器1∶1仿真模型,为考察液液射流装置对热水解污泥在反应器内的搅拌混合效果,模拟得出速度云图、速度矢量图、剪切速率图以及死区分布图,并对搅拌性能、搅拌机理进行分析。结果表明:流场区域流速范围0~1.50 m·s-1,剪切速率范围0~200 s-1;依据斯托克斯定律计算出该流场中沉降速度阈值0.30 m·s-1,低于该速度值的部分形成死区,死区主要分布在流场中心区域,其体积为600.88 m3,占总体积20.58%;相对于流场中心区域,流场内其他区域流速均值为0.60 m·s-1,得到较好的搅拌混合。     

Experimental thermal performance and enviroeconomic analysis of serpentine flow channeled flat plate solar water collector

Environmental Science and Pollution Research - The thermal performance of a flat plate solar water collector (FPSWC) depends on the amount of solar energy absorbed by the absorber, the quantity of...     

新型管状光催化反应器降解VOCs特性

以一种新型折流式管状光催化反应器为研究对象,选择甲醛、苯和甲苯为目标污染物,以紫外光源、催化剂负载量和反应器内循环流量为关键影响因素,利用非密闭型环境舱,分析了反应器降解室内VOCs特性。结果表明,在254 nm和365 nm紫外光源照射下,VOCs的总衰减系数随初始浓度的增加而增大,且254 nm紫外光源照射下的总衰减系数更大。365 nm紫外光源照射时,VOCs的反应有效度随催化剂负载量的增加而增大;254 nm紫外光源照射时,反应有效度受催化剂负载量变化的影响很小。VOCs的转化率随循环流量的增加而增大,而反应速率受循环流量的影响较小;相同的循环流量下,转化率和反应速率均随着VOCs初始浓度增加而增大。由于增设肋片,折流式管状反应器比传统无肋片管状反应器的洁净空气量提升60%,且反应有效度更接近0.5,说明前者的传质-反应速率更加匹配,降解性能明显更优。     

Statistical and diagnostic evaluation of the ADMS-Urban model compared with an urban air quality monitoring network

The present study examines the behaviour of the ADMS-Urban air quality forecasting model in predicting dispersion of traffic-related pollutants in urban areas. The study has been carried out in Ravenna (NE Italy), a medium-sized town where pollution produced by vehicle traffic accounts for most of the emissions. ADMS-Urban performances have been assessed through statistical analysis, by comparing carbon monoxide concentrations (vehicle traffic tracing pollutant) estimated by the model with concentrations measured by stations of the air quality monitoring network. Although the correspondence of values estimated by ADMS-Urban with measured values turns out to be satisfactory, the study shows that the model tends to produce an underestimated value compared with the actual situation, and identifies a corrective method that makes it possible to improve the relevant performances. Furthermore, the diagnostic analysis highlights that the model performances depend upon some meteorological parameters.     

An experimental study of air entrainment and oxygen transfer at a water jet from a nozzle with air holes.

An adequate supply of dissolved oxygen is important in natural rivers and in some water treatment processes. The dissolved oxygen concentration can be enhanced by entraining air bubbles in a receiving pool. When a water jet impinges a receiving pool at rest, air bubbles may be entrained and carried away below the pool free surface. This process is called plunging water jet entrainment and aeration. This paper describes an experimental study of the air entrainment rate and oxygen transfer efficiency of circular nozzles with and without air holes. In particular, the effect of varying the number, positions, and open/close status of the air holes is investigated. A negative pressure occurred depending on the air holes opened on the circular nozzles. This phenomenon affected the water jet expansion, water jet shape, air entrainment, and bubble penetration depth and, hence, the oxygen transfer efficiency. It was demonstrated that the air entrainment rate and the oxygen transfer efficiency of the circular nozzles with air holes were better than those of the circular nozzles without air holes. Therefore, adding air holes to a simple, circular nozzle could lead to a significantly increased air entrainment rate and oxygen transfer efficiency.     

Exergy and energy analysis of a tubular solar still with and without fins: a comparative theoretical and experimental approach

Environmental Science and Pollution Research - One of the major challenges faced by human society is the freshwater crisis and shortage of conventional energy. Solar still is considered as one of...     

用空气加热器减少轻型汽油车低温冷启动时HC、CO 排放量的研究

按照《轻型汽车污染物排放限值及测量方法(中国Ⅲ、Ⅳ阶段)》(GB 18352.3-2005)的测试规范,在一辆轻型汽油车上使用空气加热器进行发动机进气预热,并测定了车辆低温冷启动时的HC、CO排放量.结果表明,发动机启动后24 s左右,HC的瞬态排放量达到最大值,HC的排放主要集中在启动后的前150 s左右;发动机启动...     

文物保存环境调湿净化一体化装置的效果评价

相对湿度是文物保存环境的一个极其重要的参数,NOx耦合水分对于文物的破坏性很大。在前期开发的空气净化器的基础上,研究了空气净化和湿度调节系统集成技术和参数,考察了空气净化器各单元对NOx的去除率,并评价了流量和相对湿度的影响,结果发现不同净化单元的设置合理有效。相对湿度低的情况下,氮氧化物去除率较高,达到96%以上,但在相对湿度较高的情况下则降低为66%。将空气净化器串联了调湿装置后,发现调湿器调湿效果显著,在各种环境湿度的情况下能有效的保持展柜的湿度。但在降湿效果上有待提高,调湿器的结构以及参数需要进一步优化。