卷烟厂空调系统采用变风量运行的节能研究

根据卷烟厂空调系统定风量运行的特点分析了其采用变风量运行的合理性。通过比较指出变频调还变风量运行是最为节能的运行方式，并以实例说明了其经济可行性。     

舒适性空调系统AHU送风温度优化仿真研究

为解决空调机组(AHU)变风量运行方式下送风温度难以根据工况变化进行动态优化的问题,提出了一种基于PSO算法的空调机组送风温度的优化方法,该方法对空调机组运行能耗进行分解,分别建立风机能耗模型和水泵能耗模型,并以空调机组运行能耗最小为目标,以表冷器的运行性能为约束,对不同工况下空调机组的最优送风温度进行求解。仿真结果表明,该方法能有效的应用于AHU变风量运行参数的优化,与常规变风量运行方式相比具有17.72%的节能效果。     

某办公楼宇中央空调变风量控制系统设计

中央空调变风量系统应用越来越广泛,尤其是商场、办公楼等公共场所。以某办公楼宇为例,结合中央空调变风量系统的基本原理,设计了楼宇控制的方案,介绍了主要控制策略,并通过组态软件设计,对该楼宇运行状态进行监控,对今后的办公楼宇中央空调变风量控制系统的实际工程应用具有一定的参考价值。     

变风量(VAV)空调系统及其经济分析

本文介绍了变风量系统和定风量系统的特性，并以实际工程为例对两种系统的经济性进行了比较，结果表明虽然变风量空调系统的初投资较大，但它运行时能量消耗少。因此变风量空调系统具有节能、低噪声，室内温度易调节等优点，是值得推广应用的空调系统。     

卷烟厂空调系统控制技术

本文结合某卷烟厂的技改工程,介绍了在工程中采用的变水量、变风量、冷水机组变水温运行,高压电机等空调节能控制技术。     

旁通型变风量集中空调系统的节能设计和运行研究

分析讨论了旁通型变风量集中空调系统的主要特点及在工程中的设计和运行调节方法，对所存在的不足之处提出了改进意见．     

一种高效节能的有机废气催化燃烧处理系统

介绍一种采用热管换热器回收反应余热及变风量调节的有机废气催化燃烧处理系统。该系统可以实现无外加能源而自动运行 ,具有显著的节能效果     

制药行业HPLC实验室通风控制策略优化设计

高效液相色谱（HPLC）具有高灵敏度和高分离率特性。制药行业HPLC实验室的温湿度环境要求较高，大量使用万向排气罩且采用独立新风+VRF空调形式，实验室能耗高。以浙江省台州市某制药公司研发中心的HPLC实验室为例，对常规定风量控制和变风量控制策略进行对比分析，变风量控制策略有效提高了系统利用率并降低了系统运行能耗。     

能源、环保文献消息(国内部分)

010 10 1　万建武 ,廖荣生 .旁通型变风量中空调系统的节能设计和运行研究 [Ｊ].节能 ,2 0 0 0 ,(11) :8- 10 .分析讨论了旁通型变风量集中空调系统的主要特点及在工程中的设计和运行调节方法 ,对所存在的不足之处提出了改进意见。0 10 10 2　陈楫国 ,李秀芝 .浅谈离心式水泵的高效运行与状态监测 [Ｊ].节能 ,2 0 0 0 ,(11) :38- 40 .从设备状态监测与故障诊断技术的角度出发 ,提出了离心泵的节能途径 ,并简要介绍了该技术在离心泵上应用的方法、步骤和实例 ,对其节能效果进行了分析。0 10 10 3　狄育慧 .采暖建筑中墙体节能的探讨 [Ｊ].北…     

变风量空调系统的末端装置及能耗研究

介绍了变风量空调系统在大型建筑中的良好节能性 ,并对比国内外的应用差距。指出变风量末端装置对变风量系统在国内应用的影响及能耗问题 ,介绍了VAV末端的结构和控制。鉴于国外对该系统的大量应用 ,相信发展变风量末端 ,提高变风量空调系统的应用水平将对我国大型建筑的节能具有重要意义     

新风量、送风方式和空调病症

本文叙述了新风量的大小和送风方式的不同与空调病症之间的关系。     

机车空压机不打风故障的分析处理

1　故障查找思路　　ＧＫ1Ｄ型液力传动内燃机车的空压机主电路示意图和空压机起动时的控制关系示意图如图 1和图 2所示。当出现空压机不打风的故障时 ,我们一般按这两幅控制关系示意图所示的线路 ,分析查找问题所在。其基本思路如下 :一是沿空压机起动控制线路查。查ＰＣ机、功放块、空压机起动接触器、保险。若都没问题 ,则查主电路。二是沿主电路查找 ,空压机的电机、电机接线盒内 (接线柱、接线片 )、电机绕组。2　故障的分析处理　　在实际检修过程中 ,具体可按如下步骤做 :( 1)看主电路中的空压机起动线路上的保险3ＲＤ、4ＲＤ是否烧…     

The effects of air leaks on solar air collector behaviour

The construction of conventinal solar air collectors and the fact that they will operate with a significant pressure difference between the heated air stream and ambient, suggests that significant quantities of air may leak into or out of them. A search of the literature reveals no consideration of the effects these air leaks may have on the validity of collector efficiency measurements, on the efficiency itself, or indeed what the meaning of efficiency is under such operating conditions. This paper discusses the meaning of collector efficiency when leaks into the collector occur, analyses the effects on efficiency measurements, and solves the collector efficiency for the simple case of a constant leakage rate along the collector. Assuming that air leaking in from ambient can replace deliberate fresh air supply to the load as in building heating, then significant measurement errors are made if air leaks in to the collector are not accounted for. Further, the collector efficiency is increased over the no leak case, so that complex construction methods to make the collector air tight are probably not warranted.     

Effect of air leak on long term performance of air heater

In this paper, the effect of an air leak on the air heater performance is investigated. “Air leaking in” and “air leaking out” systems are examined. The effect of various parameters like leakage rate, mass flow rate, solar insolation, plate length and ambient temperature has been studied. The possibility that air leakage can take place from any where along the length of the collector has been incorporated in the model. It is found that, for “air leaking in” systems, efficiency goes up, while for “air leaking out” systems, efficiency decreases from the no-leak situation, and it depends on the position of the leak.     

空气湿度对平板空气集热器效率的影响

对不同相对湿度下的湿空气密度、定压比热容、动力粘度和导热系数等热物性参数进行了计算。在给定的平板空气集热器模型下计算得出,工作介质为相对湿度50%的湿空气比工作介质为干空气的集热器效率高12.4%。文章研究分析了太阳辐射量、空气通道高度、入口空气流速及温度对平板空气集热器顶部损失系数和效率的影响,研究结果显示,它们对介质为干空气及介质为湿空气的集热器影响趋势一致。     

Analysis of exergy demand for air heating of an air handling unit

In modern buildings, an increasing amount of the consumed energy falls on ventilation systems. The amount of energy needed for ventilation depends on weather fluctuations, wind, interaction between natural gravity and air tightness of the building, heat exchangers used in ventilation systems, efficiency of other ventilation equipment, and operating mode of ventilation systems in the building. Ventilation systems are comprised of a variety of elements that facilitate processes using energy of different types. The main elements that use energy in ventilation systems are fans, heat exchangers, and heaters. They have a significant effect on both energy needs of a public building and the exergy efficiency of a system. In order to achieve a more efficient use of exergy in heat exchangers, it is recommended to execute processes under as little temperature difference as possible; however, this increases the area of heat exchangers. Results of the analysis show that it is recommended to design ventilation systems based on the temperature that corresponds with the maximum demand of exergy in order to use the heat recovery unit as much as possible in the system.     

空气调节二次回风系统的节能问题

讨论了二次回风系统在夏季工况下与一次回风系统相比的节能效果,以及在冬季工况如何更好降低能耗的问题,着重分析了冬季工况下机器露点对能耗的影响,并提出降低能耗的途径。     

地道风系统地埋管管径对出口空气温度的影响研究

构建了空气与地道壁面换热理论模型,用于计算地埋管出口空气温度,通过正交模拟分析了地埋管管径、长度以及进口风速对地埋管出口空气温度的影响,并与数值模拟结果进行对比.结果 表明:地埋管管径极差值最大,可达20.4 m,是地埋管出口空气温度的主要影响因素,地埋管长度和进口风速为次要因素;随着管径的增大,出口空气温度随之升高;...     

Thermoeconomic optimization of the geometry of an air conditioning precooling air reheater dehumidifier

Exergy method of optimization for the geometrical parameters of an air conditioning precooling air reheater with turbulent flow is developed in this paper. The method is based on exergy, economic analysis and optimization theory. As there are humid air streams involved in the heat transfer process, then there are irreversibilities or exergy destruction, which is due to pressure losses, temperature difference and specific humidity gradient. These principle components of total irreversibility are not independent and there is a trade‐off between them. Therefore, the purpose of this research paper is to study the effect of the geometry and the specific humidity of the two streams on the irreversibilities of a crossflow precooling air reheater dehumidifier. Also, the optimum balance between the three components of irreversibility is determined thereby giving the optimum solution for heat exchanger area. The total cost function is expressed on an annualized basis of the sum of the precooler capital cost and the running cost attributable to the precooler irreversibility. This total cost function is optimized in this paper according to the optimum heat transfer area and the total irreversibilities. Two optimum heat transfer areas were found for minimum total irreversibility and minimum total annual cost for a specific example. Finally, the relations between the typical operational variables such as heat transfer area, Reynolds numbers and the total annual cost for the precooler is developed and presented in graphs, which allow the calculation of the optimal heat transfer area, which gives the optimum irreversibility and minimum total annual cost. Copyright © 2005 John Wiley & Sons, Ltd.