基于蒸发冷却的辐射吊顶与桌面工位空调复合系统设计及模拟研究

发布时间：2018-05-07 22:16

  本文选题：蒸发冷却 + 辐射供冷　； 参考：《西安工程大学》2013年硕士论文

【摘要】：基于蒸发冷却的辐射吊顶与桌面工位空调复合系统，利用蒸发冷却技术制取高温冷水和新风，分别送给室内的辐射吊顶和桌面工位空调装置。室内部分显热负荷由辐射末端消除，室内湿负荷和其余部分显热负荷由桌面工位空调承担。该复合系统是典型的独立新风控制系统，房间呈现大小环境的分区分布，大环境（背景区）和小环境（工作区），可实现分时分区控制，特别注重对人员附近工作区域的控制。桌面工位空调将新鲜空气直接送到人员呼吸区，空气品质高，人员对工作区的空调个性化控制，提高人员对环境的满意率，辐射末端采用蒸发冷却技术提供的高温冷水，节能环保。 结合蒸发冷却空调系统的实际应用情况，对辐射供冷/暖和工位空调深入学习，介绍基于蒸发冷却的辐射吊顶与桌面工位空调复合系统，并对复合系统的理论原理、特点、运行模式及其应用领域进行分析。复合系统是独立新风控制系统，属于温湿度独立控制系统的一种，对房间进行分时分区控制，能够充分利用蒸发冷却制取的高温冷水和新风，为房间提供全新风，并且直接将新鲜空气送到人员工作区，辐射吊顶与桌面工位空调相结合能够得到更好的室内气流组织。 根据复合系统的原理与特点归纳总结了复合系统的设计方法，对房间进行工作区与背景区的划分，室内由辐射末端和工位送风两套空调系统控制室内环境，与其他系统的设计方法有较多不同，并对设计流程和设计步骤做了详细的介绍，为该复合系统在实际的工程设计应用提供一定的参考。 采用Airpark软件建立了桌面工位空调系统模型，与已有的实验数据进行对比分析，验证了Airpark软件模拟桌面工位空调系统的准确性，模拟结果与实验结果的数据相吻合，误差值在可允许的范围内。Airpark软件有三种辐射模型，经过试算选择模拟收敛快、精度高的DO模型。 利用Airpark软件建立了基于蒸发冷却的辐射吊顶与桌面工位空调复合系统模型，模拟室内热环境和气流组织，分析人员工作区的热舒适性、室内空气品质。模拟结果显示： 1复合系统设计方法计算的风量、风速满足热舒适性要求，模型房间风速分布均匀，人员工作区风速小于0.3m/s，该项设计方法合理。 2在设计工况的基础上，分别提高桌面工位空调送风温度和辐射顶板的表面温度之后，室内的热环境并没有变的偏热或不舒适，反而室内的温度分布更为合理，热舒适性更好，人员的满意率提高。 3提高桌面工位空调送风温度到20℃和提高辐射顶板的表面温度到22℃，，复合系统中蒸发冷却新风机组的出风温度和高温冷水机组的出水温度的要求降低，可以减少复合空调系统的能耗，扩展了蒸发冷却的适应性区域，可以使蒸发冷却技术应用于更为广阔的领域。
[Abstract]:Based on evaporative cooling radiation ceiling and desktop air conditioning system, high temperature cold water and fresh air are made by evaporative cooling technology and sent to radiation ceiling and desktop air conditioning device respectively. The indoor sensible heat load is eliminated by the radiation end, and the indoor humidity load and the rest of the sensible heat load are carried by the desktop air conditioning. The compound system is a typical independent fresh air control system. The room presents the partition distribution of the big and small environment, the big environment (background area) and the small environment (working area), which can realize the time-sharing and partition control, especially pay attention to the control of the working area near the personnel. Desktop air conditioning sends fresh air directly to the breathing area of the personnel. The air quality is high, the personnel have individualized control of the air conditioning in the working area, and the personnel are satisfied with the environment. The radiation terminal adopts the high temperature cold water provided by the evaporative cooling technology. Energy saving and environmental protection. Combined with the practical application of evaporative cooling air conditioning system, this paper introduces the radiation ceiling and desktop air conditioning composite system based on evaporative cooling, and introduces the theoretical principle and characteristics of the composite system. Operation mode and its application field are analyzed. The compound system is an independent fresh air control system, which belongs to the temperature and humidity independent control system. It can make full use of the high temperature cold water and fresh air made by evaporative cooling to provide a new air for the room. And direct the fresh air to the personnel working area, radiation ceiling and desktop air conditioning can get better indoor airflow organization. According to the principle and characteristics of the composite system, the design method of the composite system is summarized. The working area and background area of the room are divided, and the indoor environment is controlled by two sets of air conditioning systems, the radiation terminal and the air supply station. There are many differences between the design methods of the system and other systems, and the design flow and design steps are introduced in detail, which provides a certain reference for the application of the composite system in practical engineering design. The model of desktop air conditioning system is established by using Airpark software, and compared with the existing experimental data, the accuracy of the simulation of desktop air conditioning system by Airpark software is verified. The simulation results are consistent with the experimental data. There are three kinds of radiation models in the Airpark software within the allowable range, and the do model with fast convergence and high precision is selected by trial calculation. The composite system model of radiation ceiling and desktop air conditioning based on evaporative cooling was established by using Airpark software to simulate the indoor thermal environment and airflow organization and to analyze the thermal comfort and indoor air quality of the working area. The simulation results show that: 1 the wind volume calculated by the design method of the composite system meets the requirements of thermal comfort, the wind speed distribution in the model room is uniform, the wind speed in the personnel working area is less than 0.3 m / s, the design method is reasonable. 2 on the basis of the design conditions, after raising the air supply temperature and the surface temperature of the radiant roof, the indoor thermal environment is not partial or uncomfortable, on the contrary, the indoor temperature distribution is more reasonable, and the thermal comfort is better. An increase in the satisfaction of the staff. (3) raising the air supply temperature to 20 鈩

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