转轮式热回收型间接—直接蒸发冷却空调机组的实验研究
发布时间：2018-07-20 21:57
【摘要】：转轮式热回收型间接蒸发冷却装置，是另一种新型的热回收设备，可对室内排风中蕴含的冷（热）量进行有效回收，提高能源利用效率，降低空调系统中处理新风的供冷（热）量，是一种节能效果明显的空调方式。 转轮式热回收型间接蒸发冷却装置是室内排风经过填料式直接蒸发冷却段，处理后的排风再经过转轮的一个半圆，需要处理的新风流经转轮的另一个半圆。夏季，排风将蕴含的冷量释放给显热蓄热芯体，排风温度升高，芯体的温度降低，热的新风接触到冷的显热蓄热芯体时，由于存在温度差，显热芯体将冷量释放给新风，新风温度降低；冬季则利用排风中蕴含的热量对新风进行预热。 为了提高整机的换热效率，在转轮式间接蒸发冷却段的基础上，有机地结合了直接蒸发冷却段，使得机组的出风温度更逼近于室外空气的湿球温度，甚至于室外空气的露点温度，进而提出了转轮式热回收型间接-直接蒸发冷却空调机组。 首先从理论上对机组、转轮式热交换器的结构特征、工作原理进行了分析，将不同的室外状态点在焓湿图上进行了5个分区，分析了不同区域使用该机组中各个功能段的应用形式，从理论上分析了3～10月乌鲁木齐、西安、南通使用蒸发冷却的时间占总运行时间的比例分别为93.6%，79.7%，75%；对设计风量3000m3/h空调机组采用转轮式间接蒸发冷却段、填料式直接蒸发冷却段进行设计及设备选型。 为深入分析实验样机的性能，分别做了其在中等湿度地区、高湿度地区夏季工况下的换热性能的测试，此外也做了转轮式热回收型间接蒸发冷却器在冬季工况下换热性能的测试，结果表明： （1）在模拟中等湿度地区室外气象条件下的运行测试，得出结论： a)在此实验范围内，单独开启转轮式间接蒸发冷却段，转轮式间接段最佳二次、一次风风量比为1.1，效率可达到78.5%。 b)整机开启，使转轮式间接段二次风、一次风风量比为1.1，整机的温降为14.66℃，出风温度介于室外空气的湿球温度和露点温度之间。 （2）在高湿度地区（南通）室外气象条件下的运行测试，得出结论： 整机在转轮式间接段风量比β取1.1运行时，机组的总温降是最大的，，可达到5.98℃；此时转轮式间接段的效率为74%，机组的终温可逼近室外空气的露点温度。 （3）转轮式热回收型间接蒸发冷却器在冬季的换热效果，得出结论： 当取转轮式热回收型间接蒸发冷却器经济排风、新风风量比为1.0时，室外新风温度为8.3℃，室内回风温度为26℃，热交换效率为75.3%。 （4）根据实际测试结果预测了在乌鲁木齐地区某大型超市（3～10月）采用转轮式两级蒸发冷却空调机组比传统机械制冷可节省50%的运行费用。
[Abstract]:The indirect evaporative cooling device of rotary heat recovery type is another new heat recovery equipment, which can effectively recover the cold (heat) quantity contained in the indoor exhaust air and improve the energy utilization efficiency. Reducing the cooling (heat) of fresh air in air conditioning system is a kind of energy saving air conditioning method. The indirect evaporative cooling device of runner type heat recovery type is that the indoor exhaust air passes through the packing type direct evaporative cooling section, the treated exhaust air passes through a half circle of the runner, and the fresh air that needs to be treated flows through the other half circle of the runner. In summer, the cooling amount contained in the exhaust air is released to the sensible heat storage core. When the exhaust air temperature rises, the core temperature decreases. When the hot fresh air comes into contact with the cold sensible heat storage core, because of the difference in temperature, the sensible heat core releases the cold amount to the fresh air. The temperature of the fresh wind is lowered, and the heat contained in the exhaust air is preheated in winter. In order to improve the heat transfer efficiency of the whole machine, the direct evaporative cooling section is organically combined on the basis of the indirect evaporative cooling section of the runner, so that the outlet air temperature of the unit is closer to the wet bulb temperature of the outdoor air. Even for the dew point temperature of outdoor air, the indirect-direct evaporative cooling air conditioning unit with rotary heat recovery is put forward. Firstly, the structural characteristics and working principle of the unit and runner heat exchanger are analyzed theoretically, and the different outdoor state points are divided into five zones on the enthalpy and humidity diagram. This paper analyzes the application forms of each functional section of the unit used in different regions, and theoretically analyzes the proportion of evaporative cooling time to the total operating time of Urumqi, Xi'an and Nantong from March to October, respectively, which is 93.60.79.775. The indirect evaporative cooling section of runner type and the direct evaporative cooling section of packing type are used in the design of 3000m3/h air conditioning unit and the equipment selection is carried out. In order to deeply analyze the performance of the experimental prototype, the heat transfer performance of the prototype was tested in the medium humidity region and in the high humidity area in summer. In addition, the heat transfer performance of the indirect evaporative cooler with rotary heat recovery is tested under the winter conditions. The results show that: (1) the test results are as follows: (1) the performance of the indirect evaporative cooler is tested under the simulated outdoor weather conditions in the medium humidity area. The conclusions are as follows: a) in this experimental range, the runner type indirect evaporative cooling section is opened alone, and the runner indirect section is optimized for the second time. The primary air volume ratio is 1.1, and the efficiency can reach 78.5%. B) the whole machine is opened. The ratio of primary air to secondary air is 1.1, and the temperature of the whole machine is 14.66 鈩
本文编号：2134918
[Abstract]:The indirect evaporative cooling device of rotary heat recovery type is another new heat recovery equipment, which can effectively recover the cold (heat) quantity contained in the indoor exhaust air and improve the energy utilization efficiency. Reducing the cooling (heat) of fresh air in air conditioning system is a kind of energy saving air conditioning method. The indirect evaporative cooling device of runner type heat recovery type is that the indoor exhaust air passes through the packing type direct evaporative cooling section, the treated exhaust air passes through a half circle of the runner, and the fresh air that needs to be treated flows through the other half circle of the runner. In summer, the cooling amount contained in the exhaust air is released to the sensible heat storage core. When the exhaust air temperature rises, the core temperature decreases. When the hot fresh air comes into contact with the cold sensible heat storage core, because of the difference in temperature, the sensible heat core releases the cold amount to the fresh air. The temperature of the fresh wind is lowered, and the heat contained in the exhaust air is preheated in winter. In order to improve the heat transfer efficiency of the whole machine, the direct evaporative cooling section is organically combined on the basis of the indirect evaporative cooling section of the runner, so that the outlet air temperature of the unit is closer to the wet bulb temperature of the outdoor air. Even for the dew point temperature of outdoor air, the indirect-direct evaporative cooling air conditioning unit with rotary heat recovery is put forward. Firstly, the structural characteristics and working principle of the unit and runner heat exchanger are analyzed theoretically, and the different outdoor state points are divided into five zones on the enthalpy and humidity diagram. This paper analyzes the application forms of each functional section of the unit used in different regions, and theoretically analyzes the proportion of evaporative cooling time to the total operating time of Urumqi, Xi'an and Nantong from March to October, respectively, which is 93.60.79.775. The indirect evaporative cooling section of runner type and the direct evaporative cooling section of packing type are used in the design of 3000m3/h air conditioning unit and the equipment selection is carried out. In order to deeply analyze the performance of the experimental prototype, the heat transfer performance of the prototype was tested in the medium humidity region and in the high humidity area in summer. In addition, the heat transfer performance of the indirect evaporative cooler with rotary heat recovery is tested under the winter conditions. The results show that: (1) the test results are as follows: (1) the performance of the indirect evaporative cooler is tested under the simulated outdoor weather conditions in the medium humidity area. The conclusions are as follows: a) in this experimental range, the runner type indirect evaporative cooling section is opened alone, and the runner indirect section is optimized for the second time. The primary air volume ratio is 1.1, and the efficiency can reach 78.5%. B) the whole machine is opened. The ratio of primary air to secondary air is 1.1, and the temperature of the whole machine is 14.66 鈩
本文编号：2134918
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