冬季集中供暖房间和空调房间热环境调查分析

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。     

Fast simulation of temperature distribution in air conditioned rooms by using proper orthogonal decomposition

Real-time control of air conditioning needs dynamic models of temperature distribution and air velocity field in rooms. Complete models, based on computational fluid dynamics (CFD), give this information, but they are too time-consuming for real-time applications. Therefore, a reduced model is needed. In mixed convection, when the air temperature has negligible variations, the velocity field may be considered fixed. In this case, the size of a CFD model may be reduced by solving only the energy balance equation, then putting this equation in the form of state-space and finally by reducing its order by proper orthogonal decomposition (POD). This algorithm was applied to a room equipped with a fan coil. Four fixed airflow fields, corresponding to negligible air temperature variation, were considered, resulting in four airflow patterns: the air jet sticks to the ceiling and reaches the opposite wall, the air jet falls before reaching the opposite wall, the air jet reaches the ceiling without extending along it, and the air jet falls before reaching the ceiling. The reduced model obtained from these airflow patterns was validated by comparing with CFD results for step variation of inlet temperature. As the order of the reduced model is always lower than seven, it may be used for real-time control applications.     

暖通空调气流组织数值模拟的特殊性

从计算流体力学CFD应用于暖通空调工程的角度，阐述了通风空调房间内气流组织数值计算的特殊性和难点，对风口模型、湍流模型、辐射模型、热源模型、计算收敛速度以及复杂物理条件的描述等作了分析和介绍，并提出了相应的对策或解决思路。     

夏季空调房间无组织通风的能耗分析

分别采用质量平衡法和能量平衡法校核新风量,得出逐时换气次数.对办公建筑进行了无组织通风测试,通过改变开窗面积来测定无组织通风量及其对空调能耗的影响,找出符合室内工作人员舒适性要求的新风量与开窗面积、室内地板面积的关系.     

下部送风房间空气温度分布的预测

提出了可以预测室温垂直分布的模式分析方法，多个实例的预测与实测间的差值被证明小于１．２℃。     

供暖房间热舒适模糊分析及最优室内计算温度的研究

模拟我国中部地区冬季供暖房间热微环境及人员衣着习惯,针对钢制柱式、钢制串片和钢制扁管三种典型供暖散热器,进行了人体热舒适实验,并对实验结果进行了模糊分析。得到了适用于我国中部地区供暖设计及运行的室内计算温度,其最优范围为１７．０～１９．２℃。通过对实验结果的分析,提出供暖散热器的改进方向。     

CFD仿真技术在空调房间温度场研究中的应用

利用流场仿真软件对四面出风和传统水平出风空调器温度场、速度场进行模拟，从舒适性角度作出评价，认为前者效果优于后者。实验研究为产品开发和改进提供了依据。     

自力式温控变流型送风口

文中介绍的这种风口在不需要任何外界动力条件下，冬夏可以送不同流型气流，符合气流组织原则，既节能，又方便。     

严寒地区火力发电厂供暖房间冬季进风措施的探讨

对于严寒地区火力发电厂需要通风和供暖的辅助生产房间,进风形式和保温措施等会直接影响供暖效果.根据实际工程情况,对几种自然进风口进行了比较分析,给出了结论和建议.     

洁净室冬季使用新风作为冷源的研究

针对北方地区洁净室冬季供冷时冷水机组运行不稳定的问题，研究了采用新风作为冬季冷源的可行性，给出了具体设计方法，并利用北京地区的设计实例作了验证。经过典型气象年的气象数据分析，发现北京地区有3个月的时间可以利用新风作冷源。     

Experiments on the dynamic thermal response of rooms

Experimental data on the dynamic thermal response of rooms given by a testing method based on pseudo-random binary sequences are presented. Results are obtained for two experimental configurations: a small test enclosure and an ordinary-sized room, and various tests have been carried out to determine the effects of ventilation, a different building fabric, the influence of internal air movement and different heating systems. Attention is drawn to the influence of noise and non-linearities on the experimental data, and from tests carried out by the step response method an explanation of the cause of the non-linearities is developed.     

名气通数据中心主机房恒温恒湿空调设计

介绍了信息机房恒温恒湿空调系统的设计,对系统的节能性和可靠性进行了全面的分析.采用集中冷源形式的空调系统,其制冷设备选用了具有自然冷却功能的风冷式冷水机组,该机组在室外温度低于设定温度时即可启动自然冷却功能,具有较好的节能效果.为保证系统的可靠性,室外机、室内机和水管路系统均有备份设计.     

The thermal frequency response of rooms

The theoretical background to the prediction of room thermal dynamics is described, using the sinusoidal frequency response of room air temperature to a convective heat input. A computer program is described, for predicting the sine wave response of a room over a wide range of frequency. Some computed results are presented and compared. A simple test enclosure is described and a comparison is made between computed and experimental results.     

变水温空调系统的运行节能分析

介绍了变水温空调系统,试验研究了变水温空调系统的节能效果。对某工程实例的理论计算结果表明,变水温运行比定水温运行可以减少大约7%～9%的运行能耗。     

Optimal supply air temperature with respect to energy use in a variable air volume system

In a variable air volume (VAV) system with 100% outdoor air, the cooling need in the building is satisfied with a certain air flow at a certain supply air temperature. To minimize the system energy use, an optimal supply air temperature can be set dependent on the load, specific fan power (SFP), chiller coefficient of performance, outdoor temperature and the outdoor relative humidity. The theory for an optimal supply air temperature is presented and the heating, ventilation and air-conditioning (HVAC) energy use is calculated depending on supply air temperature control strategy, average U-value of the building envelope and two outdoor climates. The analyses show that controlling the supply air temperature optimally results in a significantly lower HVAC energy use than with a constant supply air temperature. The optimal average U-value of the building envelope is in practise mostly zero.     

地板送风终端单元空调房间速度场和温度场的数值模拟

建立了数值模拟模型,通过实验验证了该模型在等温送风情况下的适用性。对非等温送风不同风量下房间内的速度场和温度场进行了数值模拟,结果表明,出口风速主要影响送风口附近区域的速度场,而对整个空调房间影响不大,室内空气流速分布较均匀,基本维持在0·25m/s以下;出口风速对温度场的分布有很大影响,垂直平面温度梯度较大,水平平面温度分布均匀。为了保证地板送风的有效性和节能性,在满足风量的同时,必须严格控制出口风速,使射流高度在工作区域附近。     

铁路空调客车内流场、温度场的数值模拟和实验研究

采用K-ε湍流模型对空调客车内三维空气流场和温度场进行了数值模拟,并进行了相应的实验研究。研究结果表明,车厢内下部乘客区空气温度高于上部区域,对热舒适性不利;上部区域存在新风短路现象,建议采用下送风方式。