空调系统的优化—冻蓄冷低温送风空调系统

介绍了利用冰蓄冷低送风空调系统,在分时计费的电价结构下,其运行费用要比常规制冷空调低得多,提高系统的性能系数。     

光伏空调系统的结构及优化配置

本文介绍了光伏空调系统的结构及系统参量的优化配置方法，并给出了了应用实例。     

基于Kuli的某商用车空调系统性能仿真及优化分析

本文利用流体分析软件Kuli建立了基于几何参数和实验数据的空调系统计算模型,对某商用车的空调系统进行了仿真分析,并用实验证实了仿真的可行性。分别建立了此空调系统的国内和国外某炎热地区的计算模型,结果表明此空调系统在国内工况可满足设计要求,而不满足国外某炎热地区的降温需求,在此基础上对空调系统提出了优化方案,优化后的空调系统可满足国外工况的设计要求。     

空调系统的优化-冰蓄冷低温送风空调系统

介绍了利用冰蓄冷低温送风空调系统,在分时计费的电价结构下,其运行费用要比常规制冷空调低得多,提高了系统的性能系数。     

地铁通风空调系统现状及改进可行性研究

地铁通风空调系统的能耗约占运行总能耗的50%。因此,通风空调系统的优化对节能至关重要。本文重点分析地铁通风空调系统的特点和普遍存在的缺陷,合理提出各个系统的改进措施和建议,降低地铁初投资和后期的运行费用。     

某居住小区冰蓄冷空调系统的设计及运行优化

结合某居住小区的一个工程实例,介绍了冰蓄冷空调系统设计的方案。在此基础上,分析了此系统的运行模式,并对此系统进行了静态经济分析,为居住类建筑的冰蓄冷空调设计提供了参考。     

上海移动某数据机房空调精确送风系统

1前言 “节能减排”已成为人们耳熟能详的一个词,与之相对应的“生态文明”也已深入人心。信产部相关官员近日表示,2006年我国规模以上电子信息产品制造业综合能源消耗量为1357万吨标准煤。单就通信行业来讲,目前我国的通信网络中仅空调,每年的耗电量就达70亿kWh,整个通信行业耗电达到200亿kWh以上。通信行业不仅是一个高科技的行业,也是一个高耗能行业。     

某车型空调降温的分析研究

以某车型为研究对象,建立三维模型,并使用三维仿真软件Star-ccm+对模型进行仿真计算,通过相应车型在整车环境实验室中的试验数据进行验证,随后对该车型降温过程中流场及温度场分布进行分析。分析表明,送风射流区域、车顶后部下方区域以及乘员头部附近区域速度较高,乘员舱前部区域比后部区域温度高,下部区域比上部区域温度高。     

蓄冷空调控制策略的选择及运行优化

蓄冷技术在空调中的应用使得满足空调负荷有更多的灵活性和复杂性。蓄冷空调能否达到节能降耗的目的,不仅取决于进行系统的合理设计,也取决于系统运行控制策略的合理选择和优化。本文介绍了蓄冷空调系统运行策略的选择原则、影响优化运行的因素和实现优化运行的方法。     

蒸发冷却空调地铁站应用的可行性分析

对地铁站的空调通风特点及建筑环境状况进行了分析总结,得出我国现行地铁站空调通风系统耗能大、空气品质不佳等问题,通过对我国现行地铁站空调通风系统的现状与蒸发冷却空调自身特性以及国外此方面实际应用效果的比较得出,若将蒸发冷却这种节能、环保的空调应用于干燥、中湿度地区的地铁站(湿度地区辅助应用),可以较好地解决现行地铁站空调...     

350 MW机组锅炉热二次风道优化设计分析

针对350 MW机组锅炉矩形热二次风道钢材耗量大、初投资高的问题,结合沧州运东2×350 MW热电联产工程,对热二次风道进行设计优化,替代常规矩形风道,工程实现了圆形热二次风道的设计,使钢材耗量明显减少,节省了初投资。     

送风管系统水力平衡及风口风量实验测试

送风管系统是将空调集中处理后的空气送入室内的系统。送风管系统保证了人们对室内环境舒适性及卫生要求,而风管水力平衡能使空调通风性能达到最佳状态。为得到送风管系统的水力平衡规律以及风口风量的变化关系,文中通过对安装有多翼式离心通风机DT-(A)-18的送风管系统调试测量,整理分析各个风口之间的风量随阀门开度变化的管网阻力特性。风管系统在特定风量下运行,利用基准风口调整法调节阀门,进而改变管网中管段的阻力,保证系统更好地满足用户的需求     

卷烟工艺空调新风用量的节能策略

通过对卷烟生产车间的热负荷状况分析,加上能源管理系统采集的工艺空调实际运行数据,证明卷烟生产车间全年绝大部分时间都需要供冷降温。通过理论分析和计算,比较了新风降温、冷水降温和微雾加湿降温3种不同方式的能耗,3种降温方式中央空调所耗能量有巨大差异。通过试验,改变新风阀的开度,空调能耗有显著变化。所以卷烟工艺空调全年应按照最低新风需求量供给,该运行策略对长江以北恒温恒湿工艺空调的节能运行具有借鉴意义。     

Indoor thermal comfort characteristics under the control of a direct expansion air conditioning unit having a variable-speed compressor and a supply air fan

Indoor thermal environment is important as it affects the health and productivity of building occupants. Direct expansion (DX) air conditioning (A/C) units are commonly used for environmental control in small- to medium-scaled buildings. This paper reports on an experimental study to investigate the indoor thermal comfort characteristics under the control of a DX A/C unit having variable-speed compressor and supply fan at a fixed space cooling load but having three different ratios between its sensible part and latent part. The experimental results suggested that under a fixed indoor total cooling load with three different space sensible heat ratios (SHRs) of 0.92, 0.72 and 0.62, varying both speeds of compressor and supply fan in the DX A/C unit would influence indoor thermal comfort. Furthermore, when a DX A/C unit having variable-speed compressor and supply fan is used for indoor thermal comfort control under abnormal indoor load conditions, its ability of indoor thermal comfort control through varying compressor speed and supply fan speed may be duly restricted.     

Analysis of cool storage for air conditioning

The paper investigates the thermal performance of ice-water cool storage systems theoretically and experimentally. Cool storage systems are used to shift electric demand from periods of high demand to those of low demand. A general lump model to determine the thermal storage characteristics is developed. The solution of the system equations is found through a Laplace transformation method. Experimental data of temperature profiles obtained for both single container and packet containers under the conditions of various flow rates and different inlet coolant temperatures confirm the validity of the theory. A closed form solution of the required time for latent-heat storage has also been established on the basis of the quasi-steady-state assumption of the coolant.     

Performance of a single‐duct portable propane air conditioning system under different refrigerant charge levels

The effects of the refrigerant charge on the performance of a portable propane air conditioning system have been evaluated and compared to nonportable systems in which the surrounding temperatures of the evaporator and condenser are not equal. This study aims to determine the similarities and differences in the performance of the two types of propane air conditioners under different charge levels, and to serve as a source of reference for future designs of portable air conditioners. The refrigerant charge was changed from ?12.3% to +30% of its normal charge at several room temperatures ranging from 20 °C to 35 °C. The performance parameters include the refrigerant temperature, mass flow rate, maximum velocity of refrigerant, maximum pressure, cooling capacity, compressor work, specific cooling capacity, and coefficient of performance of the system. It has been found that an increase in charge level was found to increase the cooling capacity, coefficient of performance, and maximum velocity of refrigerant in the system while decreasing specific cooling capacity. The increase in the charge caused a relatively insignificant rise in the maximum pressure of the system and useful work of the compressor.     

Solar cooling and air conditioning

The possibility of providing cooling and air conditioning by means of energy from the sun has attracted Man's attention since the early development of solar technology. This article attempts to describe the present state of the art in solar cooling technology. A survey is given of the vast amount of research, development and engineering work done to date in this field. The various approaches to solar cooling and the different operating systems are considered, including heat engine driven vapor compression, absorption, ejector and desiccant cooling. A comparison between the different methods and processes is given and the appropriate applications are discussed.