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首页> 外文会议>International Conference on Enhanced Building Operations; 20061106-08; Shenzhen(CN) >The Coordinated Control of a Central Air Conditioning System Based on Variable Chilled Water Temperature and Variable Chilled Water Flow
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The Coordinated Control of a Central Air Conditioning System Based on Variable Chilled Water Temperature and Variable Chilled Water Flow

机译：基于变冷水温度和变冷水流量的中央空调系统的协调控制

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摘要

At present, regulation of water flow by means of pump frequency conversion is one of the major methods for power-saving in central air conditioning systems. In this article, optimization regulation for central air conditioning system on the basis of coordinative optimization control for variable chilled water temperature and variable chilled water flow to obtain better power savings is put forward. According to typical meteorological year data, hourly air conditioning load of whole year for every typical room has been calculated with the transmission function method. In order to guarantee each typical room, the highest cooling load rate is used as an input parameter for optimization calculation. Based on the surface cooler check model, the smallest energy consumption of chiller and chiller water pump was taken as the objective function of the optimization model. The performance characteristics of a chiller, water pump, regulation valve and pipeline are taken into account, and the optimization chilled water temperature and chilled water flow were carried out. The case study for a commercial building in Guangzhou showed that the annual power consumption of the chillers and pumps of the air conditioning system is lower by 17% only with employment of variable water flow regulation by pump frequency conversion. In the case of optimization control with coordinative control of variable chilled water temperature and variable chilled water flow, the annual power consumption of the chillers and pumps of the air conditioning system is reduced by 22% in presence of remarkable power saving effects. Increasing the chilled water temperature will reduce the dehumidified capability of the air cooler, and the indoor relative humidity will increase. The simulation showed that the adjustment optimized process meets the comfort of each typical room. The lower the cooling load rate is, the more obvious the effect of power-saving is. The highest power-saving rate appears in December, which is 36.7%. Meanwhile, the least rate appears in July, which is only 14.5%.
机译：目前，通过泵变频来调节水流量是中央空调系统中节能的主要方法之一。本文提出了在变冷水温度和变冷水流量的协调优化控制的基础上，对中央空调系统进行优化调节，以达到更好的节能效果。根据典型的气象年数据，采用传递函数法计算了每个典型房间全年的每小时空调负荷。为了保证每个典型房间，最高制冷负荷率用作优化计算的输入参数。基于表面冷却器检查模型，以冷却器和冷却器水泵的最小能耗为优化模型的目标函数。考虑了冷水机，水泵，调节阀和管道的性能特点，对冷水温度和冷水流量进行了优化。以广州某商业建筑的案例研究为例，仅通过采用变频控制可变水流量，空调系统的冷水机和水泵的年能耗就降低了17％。在优化控制与可变冷却水温度和可变冷却水流量的协调控制的情况下，空调系统的冷却器和泵的年功耗在节能效果显着的情况下减少了22％。提高冷冻水温度会降低空气冷却器的除湿能力，室内相对湿度也会增加。仿真表明，调整优化过程满足了每个典型房间的舒适度。冷却负荷率越低，节电效果越明显。节电率最高的月份是12月，为36.7％。同时，最低利率出现在7月，只有14.5％。

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