Field experimental study on the cooling effect of mine cooling system acquiring cold source from return air

With the increase of mining depth, more and deeper coal mines are limited by heat disaster. The cooling energy in deep mine cooling system comes from mine water inrush or ground cooling tower, but we cannot adopt the two methods because mine water inrush in many old coal mines in China is limited. What is more, the cooling pipelines cannot be put in narrow pit-shaft. To settle the problem above, according to the characteristics of Zhangxiaolou Coal Mine, this paper adopts the deep mine return air as the cooling energy for deep mine cooling system. In addition, we carried out cite test to extract cold energy from return air. Through monitoring the water quantity, water temperature of cooling system and air temperature, we got the thermodynamic equilibrium parameters during the cooling energy acquisition analysis and the effect of cooling system that the temperature and humidity on working face are respectively reduced to 8-12 ℃ and 8-15% through cooling. This research offers experimental reference for deep mine cooling which lacks cooling energy.

A Novel Aircraft Air Conditioning System with a Sterilization Unit by Ultra-High-Temperature Air Stream

An aircraft cabin is a narrow,closed-space environment.To keep the air quality in cabin healthy for passengers,especially during an epidemic such as SARS-CoV-2(or 2019-nCoV)in 2020,a novel aircraft air conditioning system,called the ultra-high-temperature instantaneous sterilization air conditioning system(UHTACS),is proposed.Based on the proposed system,a simulation of the UHT-ACS is analysed in various flight states.In the UHT-ACS,the mixing air temperature of return and bleed air can reach temperature up to 148.8°C,which is high enough to kill bacilli and viruses in 2一8 s.The supply air temperature of the UHT-ACS in a mixing cavity is about 12 C in cooling mode both on the ground and in the air.The supply air temperature is about 42 C in heating mode.Compared with the air conditioning systems(ACS)of traditional aircraft the supply air temperatures of the UHT-ACS in the mixing cavity are in good agreement with those of a traditional ACS with 60%fresh air and 40%return air.Furthermore the air temperature at the turbine outlet of the UHT-ACS is higher than that of a traditional ACS which will help to reduce the risk of icing at the outlet.Therefore the UHT-ACS can operate normally in various flight states.

CO emission in the air return corner of the working face in shallow burial mining areas

In shallow burial mining areas, abnormal CO emission and the spontaneous combustion of coal are great threats to safety production at a fully-mechanised working face. In order to prevent the CO concentration in the air return corner from exceeding the critical limit, the paper studied the CO emission regularity and characteristics through theoretical analysis, experimental research and field observation. The results show that the main sources of CO emission were the spontaneous combustion of coal in the goaf and the exhaust emissions coming from underground motorised vehicles. The effect factors of CO emission were also investigated, such as seasonal climate changes, the advancing distance and advancing speed of the working face, the number of underground motorised vehicles and some other factors. In addition to these basic analyses, the influence mechanism of each influence factor was also summarised theoretically. Finally, this study researched the distribution and change law of CO concentration in the fully-mechanised working face in two aspects: controlling the change of monitoring points and time respectively. The research results provide a theoretical basis for preventing the CO concentration from exceeding the critical limit in the air return corner and reducing the possibility of spontaneous combustion of coal. Additionally, the results also provide important theoretical and practical guidelines for protecting miners' health in modern mines featuring high production and high efficiency all over the world.

数据中心冷却系统研究及应用进展

为加速实现数据中心节能降耗的目标,在合理、高效、最大化地利用自然冷源的同时,更不能忽视机械制冷系统本身能效的提升。加强自然冷却与机械制冷的协同,降低数据中心PUE,充分发挥安全稳定、高效运行的数据中心冷却系统自身能效至关重要。本文通过对气流组织、供/回水温度和冷却系统部件及形式3个方面的研究梳理,总结分析数据中心冷却系统节能提效有关技术研究与应用进展,从而为绿色、高效数据中心冷却系统的研发提供参考和借鉴。

新型智能化纺纱车间环境的优化措施

针对智能化纺纱车间规模大、自动化程度高、生产集约化、发热强度高的特点,提出了优化新型智能化纺纱车间环境的系列策略和措施。分析了影响车间温湿度、气流组织、空气清洁度的因素。通过采取稳定各工序半成品回潮率,提高空调除尘设备能效,强化均匀送吸风等,采用细纱车间热分流、热转移、除尘空调系统低能耗联动等方法,实现了对纺纱车间环境的优化,并配备完善的火灾自动报警和自动灭火系统,保持了车间环境的安全。认为:纺纱车间环境优化的实施可以满足新型智能化纺纱生产线的高效、绿色生产。

Numerical analysis of the return flow solar air heater(RF-SAH)with assimilation of V-type artificial roughness

A novel design of Return Flow Solar Air Heater(RFSAH)with different arrangements of baffles especially V-Type Artificial roughness is simulated and numerically analyzed with energy balance equations.To enhance the effectiveness of baffles,numerous studies have been conducted.The performance of the RFSAH is studied in terms of thermal efficiency,thermo-hydraulic efficiency,and optimization of baffle parameters.Maximum Thermal efficiency and thermo-hydraulic efficiency are found in RFSAH with baffle on both sides of the absorber plate and mass flow rate above 0.2kg/s.Sensitivity analysis of the influencing parameters is carried out and reported the best performance of the system on selective geometrical parameters(ψ=0.7,β=20%,e/H=1,p/e=0.8,α=60°).The results obtained from the present model are validated with the published experimental results and have been found in quite reasonable agreement with an average error of 16.45%.Thermal and Thermohydraulic efficiency of RFSAH with a baffle on both sides of the absorber plate is maximum among baffles below,above,and on both sides of the absorber plate.It is observed that the thermal efficiency of RFSAH is greater than SF-SAH.The proposed optimum baffles roughness is suggested to increase the air upholding time period for more efficient output.

空调二次回风系统的设计与运行案例优化分析

阐述二次回风处理参数的理论分析,揭示送风控制点O与一次回风混合点C1关联特点。结合工程实例,分析实际应用,从而解决空调系统送风温度高于送风露点,需再热引起冷热抵消的问题。

医院专项区域暖通空调系统设计要点探讨

介绍了专项区域各科室HVAC系统设计要点,主要是冷热源及加湿器的形式的选择原则,对于不同区域需要注意的事项,像DSA区域送风天花的设计、设备间温度处理;中心供应室设备夹层温度过高、环氧乙烷气体排放的处理;B2生物安全柜的补风问题;静脉配置中心的抗生素配置中心及抗肿瘤配置中心排风问题;病理科室内空气处理、排风处理;手术部的特殊手术室设计要点;监护病房及产科空气处理机组的选择等问题,以具体工程项目为例,给出了具体的解决方案。

综合性体育馆暖通空调设计的要点分析

通过对综合性体育馆空调负荷分析,赛时及赛后负荷组成,空调负荷分布特点指导冷热源选型及多种能源形式配置。分析比赛区空间气流组织形式及围绕二次回风的设计方法。比较了多种能源方案及气流组织,对冷热源的设计选型原则及BIM(Building Information Modeling,建筑信息模型)技术的应用进行总结。

大型邮轮空调水系统安全返港设计

空调系统是船舶安全区域服务系统的重要组成部分。空调水系统包括空调冷媒水系统和空调热媒水系统,其作用是将冷/热媒水从冷源或热源输送至空气处理设备。为了研究安全返港要求对大型邮轮空调水系统设计的影响,该文首先结合安全返港设计要求,给出了大型邮轮空调系统安全返港设计目的,提出了大型邮轮空调水系统安全返港的设计目的和基本设计方法。然后以某大型邮轮为例,对空调水系统的配置方案、系统原理和阀门操作展开分析研究,给出了启用安全区和支持安全返港的机械处所空调水系统安全返港设计方法,结果表明应灵活地选择不同设计方式来简化安全返港设计。此研究成果可为后续大型邮轮空调水系统设计提供参考。

7m大采高综采工作面低氧抽放技术研究与应用

大柳塔煤矿开采的52号煤层在“U”型负压通风的作用下,综采工作面在回采期间回风隅角、机尾安全出口、工作面出现不同程度的低氧现象。为从源头上进行治理,以52506工作面为例,对工作面低氧原因进行了分析,在其回采过程中在隅角处安设了负压抽放管路,改变回风隅角气体流向,均衡回风隅角和采空区之间压差,将原本涌出的有害气体直接抽排掉,从而在一定程度上减缓或抑制采空区内有毒有害气体的涌出,以达到预防低氧的目的,有效解决了低氧隐蔽致灾问题,保证了工作面安全回采。

车内污染物测定采样舱的空调系统设计

为了防治汽车车内污染,有效管控车内挥发性有机物和醛酮类物质含量,需要建造能方便快捷采集车内VOCs和醛酮类物质含量的采样舱。为此,就如何设计装配式实验采样舱,如何保证实验采样舱温湿度要求、送风均匀性,以及采用什么样的气流组织来满足实验采样舱能高效的运转检测,做初步的探讨。

一种降低四管制空调系统循环水泵能耗的技术研究

针对四管制空调系统,本文提出了一种降低其循环水泵能耗的技术。只分析夏季工况,利用增设在冷热分集水器供回水主管间的旁通管,将四管制空调系统中夏季不参与工作的热水供回水管作为空调冷水环路,将部分冷水供至末端热盘管作为一级供冷段(表面式冷却器1),末端冷盘管作为二级供冷段(表面式冷却器2);分析了该技术方案对系统阻力、水泵扬程的影响。结果表明,该技术方案改变了原空调管网水力特性,降低了管网流速,降低了冷水泵的运行能耗,实现了节能的目的。

某分布式能源站温湿度独立控制空调系统应用分析

结合国内某天然气分布式能源站的集控室空调系统,对比分析了三种典型的一次回风全空气系统和一种温湿度独立控制的一次回风全空气系统。结果表明,电厂控制室空调过程可按等湿过程考虑,露点送风的送风温差过大,不适用于集控室空调系统,改进的温湿度独立控制全空气系统具有明显的节能降耗效果,可为设计人员提供借鉴参考。

CO低负压引排系统水环真空泵设计研究

大南湖一矿利用CO引排系统治理回风隅角CO超限,为达到CO治理效果的同时,避免采空区自然发火,引排系统水环真空泵的设计尤为关键。以煤矿瓦斯抽采工程设计标准为参考,现场进行试验调整,确定合理的CO引排系统管路及水环真空泵相关参数。根据设计计算,CO低负压引排系统管路采用Φ610 mm×5000mm型螺旋焊接钢管,引排泵采用2台型号2BEC72型水环真空泵,抽气量大于515.6m^(3)/min。

全自动低温热管技术在矿井回风余热回收中的应用分析

为了充分回收矿井回风中的低温余热,对布尔台煤矿松定霍洛风井的井筒负荷和回风余热资源量进行了具体的计算分析;阐述了采用低温热管+自动化控制系统进行矿井回风预热回收的技术手段、建设方案和工艺流程。对自动化控制部分的功能、设备运行管理、热管控制系统进行了详细说明和介绍;对相匹配的矿井风道建设和热管回收矿井回风余热系统的运行进行了阐释。该系统的工程应用结果表明,采用低温热管余热回收技术+PLC智能自动化控制系统,可实现矿井回风余热的有效利用和可靠运行,每年可节约标准煤约1500 t,减少碳排放约3900 t,达到了节能减排和环保再利用的目标。

室内温、湿度对人体热舒适和空调能耗影响的研究

以采用一次回风集中空调系统的办公建筑为例,就室内温、湿度设计参数对空调房间热舒适环境和空调系统能耗的影响进行了分析。研究结果表明,在同样的室内人体热舒适环境(等效温度)的条件下,随着室内温度的增加,一次回风系统的需冷量和总的耗能量是增加的。因此,夏季提高空调室内温度是不节能的。在相同热舒适(等效温度)条件下,要减少空调系统的冷负荷,室内设计温、湿度参数在推荐的热舒适区范围内,宜采用较大的室内相对湿度和较低的室内干球温度的组合,或采用较高的等效温度。

低温全新风系统的能耗分析

简述了低温全新风系统的组成,给出了全空气系统能耗评价的数学模型,采用当量满负荷运行时间法对全新风系统和一次回风系统的全年总能耗量进行了分析和比较,结果表明:在某些工况下,低温全新风系统可以比常温一次回风系统节能,尤其是对于新风比较高的建筑,低温全新风系统具有更广阔的应用前景。

热管式空调机组在空调系统的节能应用研究

以广州地区的办公建筑为例，就一次回风集中空调系统在空气处理过程中采用热管式空调机组时．不同室内设计温度下的空调系统能耗进行了分析，并且与常规的一次回风集中空调系统的耗能量进行了比较．研究结果表明：在相同的室内设计温度下，采用热管式空调机组处理空气的一次回风集中空调系统比常规的一次回风集中空调系统节省冷量和再热量．节能效果随着室内设计温度的提高而提高．在通常的室内设计温度22.26℃范围内，相应的冷量节能率为24．3％-25．8％，总耗能量的节能率为39．1％-41．0％．

基于DDC的智能建筑中央空调一次回风系统研究

鉴于传统中央空调系统温湿度调节速率缓慢、偏差大、能耗高等缺点,提出了一种基于直接数字控制和Lon Works技术的智能建筑中央空调一次回风系统设计方案。系统底层控制网络采用海湾HW-BA5201 DDC控制器组建,上位机监控平台采用力控Force Control 7.0组态软件设计。通过温度和湿度传感器实时检测系统回风温度和湿度,PID自动调节给水阀和加湿阀开度,最终实现控制要求。系统设有压差保护,防冻保护,以及风阀执行器与风机联锁控制功能,具有一定的推广应用价值。