本文選題：冷卻塔 + 全年熱濕交換特性�。� 參考：《北京工業(yè)大學》2014年碩士論文

【摘要】：冷卻塔作為空調(diào)系統(tǒng)的重要冷卻設(shè)備之一，近些年被越來越多的應(yīng)用于建筑物非夏季工況（非額定工況）條件下的系統(tǒng)中。但是，由于冷卻塔的熱濕交換特性受很多因素的影響，導致冷卻塔廠家所提供給用戶的產(chǎn)品樣本中，冷卻塔熱工性能曲線只是以夏季工況為依據(jù)，一般只針對濕球溫度較高時，很少有廠家能夠提供冷卻塔在非夏季工況的熱工性能曲線。然而，室外氣象參數(shù)的變化直接影響冷卻塔的熱濕交換能力。隨著季節(jié)和室外空氣濕球溫度、進口水溫、水氣比等因素的變化，冷卻塔的運行工況將偏離其額定工況條件，也即冷卻塔熱濕交換能力將隨其運行條件而改變。但關(guān)于這個問題目前沒有引起大家足夠的重視和注意，即使在非夏季工況運行冷卻塔，人們也仍然習慣地沿用產(chǎn)品技術(shù)樣本給出的技術(shù)參數(shù)進行相關(guān)評價，致使冷卻塔的綜合運行效率偏低或達不到預(yù)期的冷卻效果。 為了把握非額定工況運行條件下（特別是過渡季節(jié)、冬季），影響冷卻塔高效運行的因素及其適宜的運行條件，本研究提出了冷卻塔非額定工況下的的評價指標，并選取了冷卻塔的四變量模型作為分析模型，且通過Matlab編程對模型的計算值與實測值進行了比較，計算結(jié)果表明兩者的相對誤差小于5%，驗證了模型的有效性�；谒淖兞磕Ｐ停疚膶鋮s塔的全年熱濕交換特性進行了分析研究，研究結(jié)果表明：室外濕球溫度變化直接影響冷卻塔出力，且冷卻塔變水量調(diào)節(jié)較變風量調(diào)節(jié)更具節(jié)能效果。另外，以南京地區(qū)為例，基于冷卻塔變水量運行條件，分析了夏季負荷高峰期（7、8月份）冷卻塔運行適宜的水氣比為μ=0.5~1（μ=W/G0，W=0.67W0~1.33W0）；夏季負荷平谷期（6、9月份）適宜的水氣比為μ=0.3~1（μ=W/G0，W=0.4W0~1.33W0）；過渡季節(jié)、冬季冷卻塔運行適宜的水氣比為μ=0.5~0.76（μ=W/G0，W=0.67W0~W0）。 基于以上研究，本文進一步分析了冷卻塔應(yīng)用于常規(guī)空調(diào)系統(tǒng)的適宜條件，計算分析結(jié)果表明：對于常規(guī)空調(diào)系統(tǒng)，在夏季運行過程中，冷卻塔應(yīng)優(yōu)先進行變水量調(diào)節(jié)，更利于提高系統(tǒng)能源利用效率，且7、8月份冷卻塔運行適宜的水氣比為μ=0.5~1；6、9月份適宜的水氣比為μ=0.3~1；而在過渡季節(jié)及冬季，針對冷卻塔應(yīng)用于免費供冷系統(tǒng)時，切換溫度為室外濕球溫度小于9℃，水氣比為μ=0.5~0.76，且南京地區(qū)在冬季和過渡季節(jié)3月、11月時，，開啟冷卻塔免費供冷系統(tǒng)更具節(jié)能效果。利用該研究思路進一步對我國31個省會城市適宜應(yīng)用冷卻塔免費供冷系統(tǒng)的時間進行了分析，分析結(jié)果可為冷卻塔免費供冷系統(tǒng)的設(shè)計及運行提供參考依據(jù)。另外，針對南京地區(qū)某住宅建筑小區(qū)土壤源熱泵系統(tǒng)出現(xiàn)的熱堆積問題為分析對象，課題組提出了冷卻塔過渡季節(jié)土壤補償蓄冷新方法，并分析了此系統(tǒng)中冷卻塔全年運行的適宜條件，其結(jié)果表明：南京地區(qū)6、9月份、冷卻塔、適宜的水氣比為μ=0.3~1；過渡季節(jié)（3月、11月、10月下），冷卻塔適宜的水氣比為μ=0.5~0.76。研究結(jié)果表明：采用冷卻塔過渡季節(jié)土壤補償蓄冷方法，土壤熱堆積問題可得到有效抑制，研究結(jié)果可為冷卻塔全年高效節(jié)能運行與系統(tǒng)優(yōu)化設(shè)計提供參考依據(jù)。
[Abstract]:As one of the important cooling equipment of the air conditioning system, the cooling tower has been more and more applied to the system under non rated operating conditions in recent years. However, the heat and wet exchange characteristics of the cooling tower are influenced by many factors, which lead to the thermal properties of the cooling tower in the cooling tower manufacturers. The energy curve is only based on the summer working condition. In general, only when the temperature of the wet bulb is high, few manufacturers can provide the thermal performance curve of the cooling tower in the non summer conditions. However, the change of outdoor meteorological parameters directly affects the heat and humidity exchange capacity of the cooling tower. The operating conditions of the cooling tower will deviate from its rated operating conditions, that is, the heat and humidity exchange capacity of the cooling tower will change with its operating conditions. However, there is no enough attention and attention to this problem at present. Even in the non summer operation of cooling tower, people are still used to use the product technology samples. The relative evaluation of technical parameters leads to the low efficiency of the cooling tower and the failure of the expected cooling effect.
In order to grasp the factors affecting the efficient operation of the cooling tower and its suitable operating conditions under the operating conditions of the non rated operating conditions (especially in the transition season, winter), the evaluation index of the cooling tower under the non rated operating conditions is put forward, and the four variable model of the cooling tower is selected as the analysis model, and the calculation of the model is calculated by Matlab programming. The comparison between the measured value and the measured value shows that the relative error of the two is less than 5%, and the validity of the model is verified. Based on the four variable model, the heat and humidity exchange characteristics of the cooling tower are analyzed and studied. The results show that the temperature change of the outdoor wet bulb directly affects the output of the cooling tower, and the variable water regulation of the cooling tower is more than that of the cooling tower. In addition, taking Nanjing area as an example, based on the operating conditions of variable water quantity in the cooling tower, the optimum water and gas ratio of the cooling tower in summer load peak (7,8 month) was analyzed. The appropriate water and gas ratio of summer load in Pinggu period (6,9 month) was mu =0.3~1 (W=0.67W0~1.33W0), and the appropriate water and gas ratio of summer load in the summer period (6,9 month) was mu =0.3~1 (W=0.4W0~1.33W0). In the transitional season, the suitable water / gas ratio for cooling tower operation in winter is =0.5~0.76 (=W/G0, W=0.67W0~W0).
Based on the above research, this paper further analyzes the suitable conditions for the cooling tower to be used in the conventional air conditioning system. The calculation and analysis results show that, for the conventional air conditioning system, the cooling tower should give priority to the variable water regulation during the summer operation, which is more conducive to improving the energy efficiency of the system, and the appropriate water and gas ratio in the cooling tower of the 7,8 month. For =0.5~1, the appropriate water and gas ratio is =0.3~1 in the month of 6,9, while in the transition season and winter, when the cooling tower should be used for free cooling system, the temperature of the cooling tower is less than 9 C, the ratio of water to gas is =0.5~0.76, and the free cooling system of the cooling tower is more efficient in the winter and transition season in Nanjing and in November. This study further analyzes the time of the cooling tower free cooling system suitable for the 31 provincial capital cities in China. The analysis results can provide reference for the design and operation of the cooling tower free cooling system. In addition, the heat accumulation problem of the soil source heat pump system in a small residential building area in Nanjing area is solved. For the analysis object, a new method of soil compensation and cooling in the transition season of cooling tower is put forward, and the suitable conditions for the whole year operation of the cooling tower in this system are analyzed. The results show that the suitable water and gas ratio is mu =0.3~1 in the 6,9 month of Nanjing and the appropriate water and gas ratio, and the appropriate water and gas ratio of the cooling tower is =0.5~0. in the transition season (March, November, and the month). 76. the results of the study show that the problem of soil thermal accumulation can be effectively suppressed by the method of soil compensation and cooling in the transition season of cooling tower. The results can provide reference for the efficient and energy-saving operation of the cooling tower and the system optimization design for the whole year.
【學位授予單位】：北京工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU831

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相關(guān)期刊論文 前2條

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2 徐欣;楊木和;;應(yīng)用冷卻塔免費供冷技術(shù)的特性分析[J];制冷技術(shù);2012年02期

本文編號：2014836