冷水机组是民用建筑、工业生产和数据中心等领域常用的空调冷源。降低冷水机组能耗对于整个空调系统的节能具有重大意义。蒸发冷却冷水机组通过水蒸发吸热降低水的温度，无需压缩机辅助且不使用制冷剂，是一种节能环保的制冷技术。为了拓宽蒸发冷却冷水机组的应用范围，提出一种转轮除湿蒸发冷却冷水机组并对其进行性能和适用性研究。该冷水机组应用转轮除湿技术降低环境空气露点温度，再利用蒸发冷却技术制备出低于环境空气露点温度的冷冻水；同时，利用热管换热器回收蒸发冷却低温排风降低转轮除湿系统的显热负荷并提高转轮除湿机的解吸性能。

首先，对转轮除湿蒸发冷却冷水机组进行热力过程分析和㶲特性分析。研究表明：与蒸发冷却机械制冷复合冷水机组相比，转轮除湿蒸发冷却冷水机组的㶲效率增加28.4%，㶲损失降低17.0%。

其次，对转轮除湿蒸发冷却冷水机组进行实验研究。设计并搭建机组实验台，研究了主要运行参数对转轮除湿蒸发冷却冷水机组的影响，并与直接蒸发式冷水机组在5种环境条件下就供水温度和湿球效率进行了对比。研究表明：转轮除湿蒸发冷却冷水机组在5种环境条件下的供水温度平均低于直接蒸发式冷水机组10.2 ℃，且机组的湿球效率在高温高湿状态（36 ℃、80% RH）下达到最高，是直接蒸发式冷水机组的6倍。

再次，将转轮除湿蒸发冷却冷水机组应用于数据中心冷却。为了回收数据中心余热作为转轮除湿的驱动力，获得数据中心在不同冷热通道封闭方式下的回风温度，应用Airpak模拟软件对数据中心热环境进行模拟。研究表明：当送风温度从18 ℃变化至27 ℃，未封闭冷热通道的机房回风口处的空气温度为29.5~39.8 ℃；封闭冷通道的机房回风口处的空气温度为30.3~40.9 ℃；封闭冷热通道的机房回风口处的空气温度为30.0~42.2 ℃。在三种不同的通道封闭形式中，封闭冷热通道的机房具有最高的回风温度，更有利于降低转轮除湿蒸发冷却冷水机组的再生能耗。

最后，利用TRNSYS模拟软件对转轮除湿蒸发冷却冷水机组建模，将其应用在5个典型城市的数据中心，并根据环境湿球温度实现对该冷水机组的模式切换。研究表明：转轮除湿蒸发冷却冷水机组在5个城市的送风温度基本稳定在22±1 ℃，供水温度稳定在17±1 ℃，可以满足数据中心的冷却要求。转轮除湿蒸发冷却冷水机组在5个地区的年平均电能使用效率(PUE)均低于1.4。

Chiller is a common air conditioning cold source in the fields of civil construction, industrial production and data center. Reducing the energy consumption of the air conditioning water system is of great significance for the energy saving of the entire air conditioning system. Evaporative cooling chillers reduce the water temperature by absorbing heat from water evaporation. It is an energy-saving and environmentally friendly cooling technology without compressor assistance and refrigerant. In order to broaden the application range of evaporative cooling chillers, a desiccant wheel evaporative cooling chiller was designed and its performance and applicability were studied. The chiller uses a rotary wheel dehumidification system to reduce the ambient air dew-point temperature, and then uses evaporative cooling technology to prepare chilled water below the ambient air dew-point temperature. The sensible cooling capacity of the evaporative cooling low-temperature exhaust air recovered by the unit reduces the sensible heat load of the wheel dehumidification system and improves the desorption performance of the wheel dehumidification machine.

Firstly, the thermodynamic process analysis and exergy analysis of the desiccant wheel evaporative cooling water chiller are carried out. The research shows that compared with the evaporative cooling mechanical refrigeration composite chiller, the exergy efficiency of the desiccant wheel evaporative cooling chiller is 28.4% higher and the exergy loss is reduced by 17.0%.

Secondly, the experimental study on the desiccant wheel evaporative cooling chiller was carried out. The effects of air-water ratio, regeneration temperature and ambient air parameters on the desiccant wheel evaporative cooling chiller were studied by designing and building the experimental platform of rotary dehumidification evaporative cooling chiller. The water supply temperature and wet-bulb efficiency of the desiccant wheel evaporative cooling chiller were compared with those of the direct evaporative chiller under five environmental conditions. The results show that the average water supply temperature of the desiccant wheel evaporative cooling chiller under five environmental conditions is 10.2 ℃ lower than that of the direct evaporative chiller, and the wet-bulb efficiency of the proposed chiller reaches the highest at high temperature and high humidity ( 36 ℃, 80 % RH ), which is 6 times that of the direct evaporative chiller.

Thirdly, the desiccant wheel evaporative cooling chiller is applied to the data center cooling. In order to recover the waste heat of the data center as the driving force of the desiccant wheel, the return air temperature of the data center under different cold and hot channels is obtained. The thermal environment of the data center was simulated using the Airpak software. The results show that when the supply air temperature changes from 18 ℃ to 27 ℃, the air temperature at the return air outlet of the data center without closed cold and hot channels is 29.5 ~ 39.8 ℃. The air temperature at the return air outlet of the data center with closed cold channel is 30.3 ~ 40.9 ℃ The air temperature at the return air outlet of the data center with closed cold and hot channels is 30.0 ~ 42.2 ℃. Among the three different channel closure forms, the data center with closed hot and cold channels has the highest return air temperature, which is more conducive to reducing the regeneration energy consumption of the desiccant wheel evaporative cooling chiller.

Finally, using TRNSYS simulation software to model the desiccant wheel evaporative cooling chiller, it is applied to the data center of five typical cities and the mode switching of the chiller is realized according to the wet-bulb temperature. The research shows that the supply air temperature of the desiccant wheel evaporative cooling chiller in five cities is basically stable at 22 ± 1 °C, and the water supply temperature is stable at 17 ± 1 °C, which can meet the cooling requirements of the data center. The annual average power use efficiency ( PUE ) of desiccant wheel evaporative cooling chillers in five regions was less than 1.4.

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