新型露點蒸發(fā)冷卻系統(tǒng)理論與實驗研究
發(fā)布時間：2018-09-09 11:08
【摘要】：蒸發(fā)冷卻技術(shù)是一種可再生和可持續(xù)發(fā)展的冷卻方式,具有節(jié)能、環(huán)保、經(jīng)濟的突出特點。如何提高蒸發(fā)冷卻系統(tǒng)能量利用效率、增強其顯熱處理能力是目前研究的主要方向。本文針對傳統(tǒng)蒸發(fā)冷卻系統(tǒng)存在的問題,利用露點間接蒸發(fā)冷卻熱力過程理想情況下趨于可逆的特性,綜合考慮熱力性能、體積、實用性等因素,提出了基于復(fù)合叉流露點式間接蒸發(fā)冷卻器的新型露點蒸發(fā)冷卻系統(tǒng),并進行了理論和實驗研究。主要研究內(nèi)容包括:(1)建立了傳統(tǒng)蒸發(fā)冷卻系統(tǒng)和新型露點蒸發(fā)冷卻系統(tǒng)的火用分析模型,計算并分析比較了典型工況下二者的能源有效利用情況,結(jié)果新型系統(tǒng)火用效率提高約2%、有效輸出火用增加約16.9%,表明新型系統(tǒng)具有更高的火用效率和更大的有效火用輸出能力。此外,新型系統(tǒng)送風(fēng)的溫度和含濕量明顯低于傳統(tǒng)蒸發(fā)冷卻系統(tǒng),從而具有更強承擔(dān)熱濕負荷的能力。(2)設(shè)計并建立了單級叉流露點式間接蒸發(fā)冷卻器實驗系統(tǒng)和三級新型露點蒸發(fā)冷卻實驗系統(tǒng),根據(jù)我國不同地區(qū)空氣濕球溫度的變化情況,利用實驗室中空氣預(yù)處理裝置模擬了八種典型氣候條件,對系統(tǒng)的冷卻性能進行了實驗研究,分析了影響冷卻性能的因素,討論并分別給出了單級系統(tǒng)和三級系統(tǒng)在不同工況下對八種典型氣候條件的適用性,同時也獲得了單級系統(tǒng)和三級系統(tǒng)在八種典型氣候條件下冷卻性能的變化情況。(3)建立了單級叉流露點式間接蒸發(fā)冷卻器及三級新型露點蒸發(fā)冷卻系統(tǒng)的熱質(zhì)交換數(shù)學(xué)模型,計算并分析了通道寬度、通道長度、開孔率、換熱面積比等結(jié)構(gòu)參數(shù)以及空氣狀態(tài)參數(shù)對濕球效率、露點效率、制冷量等冷卻性能的影響規(guī)律,實現(xiàn)了單級叉流露點式間接蒸發(fā)冷卻器及三級新型露點蒸發(fā)冷卻系統(tǒng)結(jié)構(gòu)參數(shù)以及運行參數(shù)的優(yōu)化匹配。在最優(yōu)結(jié)構(gòu)參數(shù)和運行參數(shù)條件下,兩者的濕球效率分別為122%和134%。(4)評價了改進型叉流露點式間接蒸發(fā)冷卻器與傳統(tǒng)板式間接蒸發(fā)冷卻器的冷卻性能,分析了兩種間接蒸發(fā)冷卻器冷卻性能的影響因素,對二者在不同環(huán)境空氣狀態(tài)參數(shù)下的適用性進行了綜合評價。在典型工況下,兩種冷卻器單獨使用且空氣流量較小時,露點式的冷卻能力較傳統(tǒng)板式最高提升了20.1%;兩種冷卻器分別用于三級蒸發(fā)冷卻系統(tǒng)第一級時,傳統(tǒng)板式在空氣流量較大時冷卻能力較露點式最高提升了9.7%;分別用于三級蒸發(fā)冷卻系統(tǒng)第二級時,露點式的冷卻能力較傳統(tǒng)板式最高提升了42.4%。此外,揭示了改進型叉流露點式間接蒸發(fā)冷卻器內(nèi)熱質(zhì)傳遞規(guī)律,指出了其內(nèi)部熱質(zhì)交換的薄弱區(qū)域,并提出了進一步提高其冷卻性能的新思路。
[Abstract]:Evaporative cooling technology is a kind of renewable and sustainable cooling method, which has the outstanding characteristics of energy saving, environmental protection and economy. How to improve the energy utilization efficiency of evaporative cooling system and enhance its sensible heat treatment capacity is the main research direction at present. In view of the problems existing in the traditional evaporative cooling system, the characteristics of dew-point indirect evaporative cooling process tend to be reversible under ideal conditions, and the factors such as thermodynamic performance, volume, practicability and so on are considered in this paper. A new type of dew point evaporative cooling system based on compound cross point indirect evaporative cooler is proposed and studied theoretically and experimentally. The main research contents are as follows: (1) the exergy analysis models of the traditional evaporative cooling system and the new dew point evaporative cooling system are established, and their energy efficiency under typical working conditions is calculated and compared. Results the exergy efficiency and effective output exergy of the new system were increased by about 2 and 16. 9 respectively, which indicated that the new system had higher exergy efficiency and greater effective exergy output ability. In addition, the air temperature and moisture content of the new system are significantly lower than those of the conventional evaporative cooling system. Therefore, it has stronger ability to bear heat and humidity load. (2) the experimental system of single-stage outpouring point indirect evaporative cooler and three-stage new-type dew point evaporative cooling system are designed and established. According to the change of air wet bulb temperature in different regions of China, Eight typical climatic conditions were simulated by using the air pretreatment device in the laboratory. The cooling performance of the system was studied experimentally, and the factors affecting the cooling performance were analyzed. The applicability of single-stage system and three-stage system to eight typical climatic conditions under different operating conditions are discussed and given respectively. At the same time, the change of cooling performance of single-stage system and three-stage system under eight typical climatic conditions is also obtained. (3) the mathematical model of heat and mass exchange of single-stage outpouring point indirect evaporative cooler and three-stage new-type dew point evaporative cooling system is established. The influence of structural parameters such as channel width, channel length, opening rate, heat transfer area ratio and air state parameters on cooling performance such as wet bulb efficiency, dew point efficiency and refrigerating capacity are calculated and analyzed. The optimization and matching of the structure parameters and operation parameters of the single stage outpouring point indirect evaporative cooler and the three-stage new-type dew point evaporative cooling system are realized. Under the optimal structural parameters and operating parameters, the wet bulb efficiencies are 122% and 134% respectively. (4) the cooling performance of the improved fork point indirect evaporative cooler and the traditional plate indirect evaporative cooler is evaluated. The factors influencing the cooling performance of two indirect evaporative coolers are analyzed and their applicability under different ambient air state parameters are comprehensively evaluated. Under typical conditions, the cooling capacity of dew point type is increased by 20.1when the two coolers are used separately and the air flow rate is small, and the two coolers are used in the first stage of three-stage evaporative cooling system respectively. The cooling capacity of the traditional plate type is 9.7g higher than that of the dew point type when the air flow rate is larger, and the cooling capacity of the dew-point type is 42.4% higher than that of the traditional plate type when it is used in the second stage of the three-stage evaporative cooling system respectively. In addition, the heat and mass transfer law in the improved fork discharge indirect evaporative cooler is revealed, the weak area of heat and mass exchange in the improved fork type indirect evaporative cooler is pointed out, and a new idea for further improving its cooling performance is put forward.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU831
本文編號：2232202
[Abstract]:Evaporative cooling technology is a kind of renewable and sustainable cooling method, which has the outstanding characteristics of energy saving, environmental protection and economy. How to improve the energy utilization efficiency of evaporative cooling system and enhance its sensible heat treatment capacity is the main research direction at present. In view of the problems existing in the traditional evaporative cooling system, the characteristics of dew-point indirect evaporative cooling process tend to be reversible under ideal conditions, and the factors such as thermodynamic performance, volume, practicability and so on are considered in this paper. A new type of dew point evaporative cooling system based on compound cross point indirect evaporative cooler is proposed and studied theoretically and experimentally. The main research contents are as follows: (1) the exergy analysis models of the traditional evaporative cooling system and the new dew point evaporative cooling system are established, and their energy efficiency under typical working conditions is calculated and compared. Results the exergy efficiency and effective output exergy of the new system were increased by about 2 and 16. 9 respectively, which indicated that the new system had higher exergy efficiency and greater effective exergy output ability. In addition, the air temperature and moisture content of the new system are significantly lower than those of the conventional evaporative cooling system. Therefore, it has stronger ability to bear heat and humidity load. (2) the experimental system of single-stage outpouring point indirect evaporative cooler and three-stage new-type dew point evaporative cooling system are designed and established. According to the change of air wet bulb temperature in different regions of China, Eight typical climatic conditions were simulated by using the air pretreatment device in the laboratory. The cooling performance of the system was studied experimentally, and the factors affecting the cooling performance were analyzed. The applicability of single-stage system and three-stage system to eight typical climatic conditions under different operating conditions are discussed and given respectively. At the same time, the change of cooling performance of single-stage system and three-stage system under eight typical climatic conditions is also obtained. (3) the mathematical model of heat and mass exchange of single-stage outpouring point indirect evaporative cooler and three-stage new-type dew point evaporative cooling system is established. The influence of structural parameters such as channel width, channel length, opening rate, heat transfer area ratio and air state parameters on cooling performance such as wet bulb efficiency, dew point efficiency and refrigerating capacity are calculated and analyzed. The optimization and matching of the structure parameters and operation parameters of the single stage outpouring point indirect evaporative cooler and the three-stage new-type dew point evaporative cooling system are realized. Under the optimal structural parameters and operating parameters, the wet bulb efficiencies are 122% and 134% respectively. (4) the cooling performance of the improved fork point indirect evaporative cooler and the traditional plate indirect evaporative cooler is evaluated. The factors influencing the cooling performance of two indirect evaporative coolers are analyzed and their applicability under different ambient air state parameters are comprehensively evaluated. Under typical conditions, the cooling capacity of dew point type is increased by 20.1when the two coolers are used separately and the air flow rate is small, and the two coolers are used in the first stage of three-stage evaporative cooling system respectively. The cooling capacity of the traditional plate type is 9.7g higher than that of the dew point type when the air flow rate is larger, and the cooling capacity of the dew-point type is 42.4% higher than that of the traditional plate type when it is used in the second stage of the three-stage evaporative cooling system respectively. In addition, the heat and mass transfer law in the improved fork discharge indirect evaporative cooler is revealed, the weak area of heat and mass exchange in the improved fork type indirect evaporative cooler is pointed out, and a new idea for further improving its cooling performance is put forward.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU831
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