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双风管空调系统是用一根风管送热风,另一根风管送冷风,冷热风在房间送风口前的末端装置(包括混合调节器和定风量调节器)内根据室内温度的要求进行混合,冷热风量的比例由自动控制装置来调节。该系统能较好的保证每个房间要求的室内温度,适用于室内温度不固定(每个房间需随时调节温度),各个房间温度要求不同的(科研楼、试验室和高级宾馆等)以消除余热为主且余湿量变化较小的多房间空调建筑,特别适用于热负荷变化较大的多房间空调对象。因需两根送风管道占空间较大,一次投资增加,而且当采用高速系统时需要末端装 相似文献
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地铁站的通风空调系统能耗占比较高,温和地区地铁站设备与管理用房通风空调系统装机容量大,为节能重点。地铁站设备与管理用房通风空调系统的设计呈现“模块化”特点,其设计、运行中存在的问题尚不清晰。2018年11月,对昆明市3座地下车站设备与管理用房室内热环境开展实测,测试参数包括各房间的送、排风量,空调送风温度,通风送风温度,通风排风温度。实测数据表明:各房间送、排风量,换气次数与设计值差异较大;空调房间的换气次数普遍远高于规范规定的最小值;新风井处的新风温度不能代表各房间的送风温度,送风机及风管传热导致的温升不可忽略;房间室内温度普遍偏低,其中,有人员常驻的房间室内温度集中分布在20~24℃,无人员常驻的空调房间室内温度最低,且存在较多低于规范规定范围下限的情况,非空调房间室内温度受室内发热量、换气次数、室外气象影响明显。 相似文献
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玻璃窗面积过大会造成空调房间空气局部负荷偏大,而空调系统设计中不会对此进行专门计算,对大玻璃窗影响的低估会导致人体热舒适不易保证。本文针对冬冷夏热地区某实际办公室,对玻璃窗面积较大的房间冬季供暖期的室内热环境进行了实测。结果表明:玻璃窗是保温薄弱环节,热桥效应会造成供暖房间温度水平分布不均匀,近窗处温度明显低于室内平均温度。对于已存在的空调系统,提高送风速度可减小温度分布的不均匀性。 相似文献
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空调负荷包括冷负荷和热负荷,本讲内容主要涉及冷负荷。计算房间空调冷负荷时,首先要区分得热量和冷负荷这两个不同的概念。室内总得热量是指某一时刻由室外进入室内和由室内热源散发到室内的热量之和,这些得热量来源于太阳辐射、室内外温差、照明、人体和设备等。房间计算冷负荷则指:为保持室内一定温度,上述各得热量经房间围护结 相似文献
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暖通空调行业作为实现“双碳”目标的重要领域,其低碳发展对实现目标起着重要的作用。以夏热冬冷地区上海市某工程为例,对其进行设计日逐时冷热负荷,不同负荷区间的累计冷热负荷分布进行计算,得出不同负荷区间的运行时间、累计冷热负荷值以及对应的室外干湿球温度平均值。空调系统部分负荷时间占比较大,基于制冷时候优先开启冷水机组,制热时优先开启风冷热泵机组的运行策略,通过4种空调冷热源方案的比较,从初投资、运行能耗、碳排放角度论证了冷水机组+热水锅炉+风冷热泵组合形式具有一定的推广性,以期为其他工程空调冷热源方案的选择提供设计参考。 相似文献
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近年来,随着我国大批空调系统陆续投入使用,空调系统的实际冷热负荷与计算负荷的不一致越来越引起人们的注意。对计算机控制空调系统经济运行的研究的开展,也要求我们能够对自动控制下的空调房间室温的实际变化过程做更深入的定量分析。节能建筑物和节能运行方式的研究,太阳能采暖系统保证率的分析,也提出了模拟建筑物长期动态热过程的要求。这样,我们希望能够计算出在给定的运行方式,控制方式及外界条件下,房间空气温度的实际波动情况和空调系统向房间投入的冷热量随时间的变化,以及在某种运行方式下,空调系统全月全年的耗能量。对于上述的问题,目前普遍认为是一个计算复 相似文献
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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。 相似文献
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万建武 《华南建设学院西院学报》1999,(1)
本文指出了在空调房间末端冷量可调的空调系统,对制冷设备容量选择具有很大影响的室内冷负荷应当以空调建筑中所有房间逐时冷负荷的综合最大值为依据,并以风机盘管加新风空调系统为例,就空调房间计算冷负荷和建筑计算冷负荷在空调工程中的应用提出了具体的计算方法. 相似文献
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Raad Z. HomodKhairul Salleh Mohamed Sahari Haider A.F. Almurib 《Energy and Buildings》2011,43(9):2043-2054
The purpose of heating, ventilating and air conditioning (HVAC) system is to provide and maintain a comfortable indoor temperature and humidity. The objective of this work is to model building structure, including equipments of HVAC system. The hybrid HVAC model is built with physical and empirical functions of thermal inertia quantity. Physical laws are used to build the sub-model for subsystems that have low thermal inertia while the empirical method is used to build the sub-model for subsystems with high thermal inertia. The residential load factor (RLF) is modeled by residential heat balance (RHB). RLF is required to calculate a cooling/heating load depending upon the indoor/outdoor temperature. The transparency, functionality of indoor/outdoor temperatures and simplicity of RLF makes it suitable for modeling. Furthermore, the parameters of the model can be calculated differently from room to room and are appropriate for variable air volume (VAV) factor. Nowadays, a VAV system is universally accepted as means of achieving both energy efficiency and comfortable building environment. In this research work, a pre-cooling coil is added to humidify the incoming air, which controls the humidity more efficiently inside conditioned space. The model presented here is verified with both theoretical and numerical methods. 相似文献
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《Building and Environment》2004,39(9):1101-1114
In both tropical and subtropical regions, residential air conditioning serves to maintain appropriate indoor thermal environments not only at daytime, but also at nighttime in bedrooms for sleeping. However, the current practices for air conditioning are primarily concerned with the situations in which people are awake at daytime. Therefore, these may not be directly applicable to nighttime bedroom air conditioning. This paper reports on a simulation study on the characteristics of nighttime bedroom cooling load in tropics and subtropics, using a building energy simulation program. The weather conditions of and the typical arrangements of high-rise residential blocks in Hong Kong are used in the simulation study. The simulation results on the cooling load characteristics in bedrooms under three different operating modes of room air conditioners (RACs) at the summer design day, the breakdown of the total cooling load in a bedroom at nighttime operating mode (NOM), indoor air temperature and mean radiant temperature variation at NOM, and the effects of indoor design air temperature on the cooling load characteristics at NOM are presented. The differences in the cooling load characteristics among three different operating modes and the issues related to the sizing of RACs used in bedrooms are discussed. 相似文献
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中国电信通信指挥楼/北京电信通信机房楼空调系统设计 总被引:1,自引:0,他引:1
介绍了该工程的空调系统设计。工艺性空调房间主要采用了风冷式机房专用空调机组,舒适性空调房间采用风机盘管加新风系统。系统分内、外区,水系统为两管式。设计解决了多种功能房间对空调系统的需求问题,满足了电信工艺机房对空调系统负荷容量及不间断运行方面的要求,同时考虑了工艺用房在气体消防后的事故通风问题。 相似文献
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《Building and Environment》2001,36(7):901-908
A computational fluid dynamics (CFD) simulation for analyzing indoor cooling/heating load is presented in this study. It is coupled with a radiative heat transfer simulation and heating, ventilating, and air-conditioning (HVAC) controlling system in a room. This new method feeds back the outputs of the HVAC system control to the input boundary conditions of the CFD, and this method includes a human model to evaluate the thermal environment. It would be used to analyze the heating/cooling loads of different HVAC systems under the condition of the same human thermal sensation (e.g. PMV, operative temperature, etc.) even though the temperature and air-velocity distribution in the room are different from each other.To examine the performance of the new method, a cooling load and a thermal environment within a semi-enclosed space, which opens into an atrium space, is analyzed under the steady-state conditions during the summer season. This method is able to analyze the indoor cooling load with changes of target thermal environments of a room and/or changing clothing conditions of occupants considering the temperature and air-velocity distribution in the room. In this paper, two types of HVAC system are compared; i.e. radiation-panel system and all-air cooling system. The radiation-panel cooling system is found to be more energy efficient for cooling the semi-enclosed space. Changes of the level of thermal environment reduce cooling load effectively in case of the all-air cooling system while the radiation-panel system does not reduce cooling load even though the targeted thermal condition is relaxed. Energy saving effect is expected by easing the clothing conditions of occupants. In this study, the reducing effect of cooling load is quantitatively evaluated with clothing conditions also. 相似文献
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冬季集中供暖房间和空调房间热环境调查分析 总被引:3,自引:0,他引:3
定量比较了集中供暖房间和使用家用热泵空调房间的热环境测试数据,并通过分析其对人体舒适性的影响,指出采用空调时应充分考虑送热风时的气流组织,避免吹风感;集中供暖房间的温度设置应比空调的低,可同时满足舒适感、节能和空气品质的要求。 相似文献