本文選題：翅片管式換熱器 + 平行流式冷凝器��； 參考：《天津大學》2014年碩士論文

【摘要】：隨著社會的進步和人民生活水平的提高，制冷空調走進人們的日常生活，其能源消耗也占總能耗相當大的比例，而且其所用的制冷劑也會對環(huán)境造成不利影響。國際社會對能源短缺和環(huán)境保護問題日益關注，制冷空調能源的高效利用以及制冷劑的替代問題成為行業(yè)熱點問題。 換熱器是制冷空調系統(tǒng)中的重要設備之一。對它的運行性能仿真模擬的準確性，對于換熱器本身以及整個制冷系統(tǒng)的優(yōu)化設計和減小能源消耗是很重要的。分析低GWP工質空調換熱器的性能會對環(huán)保制冷劑的研究與替代有理論指導意義。綜上所述，本文的研究工作主要有下面幾項。 本文在國內外現有研究成果的基礎上，考慮了制冷劑的壓降以及實際流動狀態(tài)，建立了翅片管式蒸發(fā)器與冷凝器的穩(wěn)態(tài)分布參數數學模型。利用Visual Basic計算機語言編寫了翅片管式蒸發(fā)器和冷凝器的仿真計算程序，并開發(fā)了具有友好界面的仿真軟件。利用這個仿真軟件模擬了低GWP工質R290、HFO1234yf和HFO1234ze在翅片管式換熱器中的流動和換熱特性。分析了改變迎面風速、制冷劑質量流量以及管徑尺寸時換熱量和壓降的變化情況，并與現在廣泛使用的R410A進行了性能的對比分析。 利用焓差熱平衡室，在R290制冷系統(tǒng)中對翅片管式蒸發(fā)器和冷凝器的工作性能進行了測試，利用測試的數據驗證了模型的正確性。除此之外還利用文獻中實驗數據對模型進行了驗證。通過這兩方面的驗證，證明了所建模型具有一定的精度，可以用來對翅片管式換熱器的性能進行仿真模擬。 建立了汽車空調中廣泛使用的平行流式冷凝器的穩(wěn)態(tài)分布參數模型，，并利用文獻中的實驗數據進行了對比驗證。最后，利用此模型對比分析了R134a及其潛在替代制冷劑HFO1234yf在平行流式冷凝器中的流動和換熱特性。
[Abstract]:With the progress of society and the improvement of people's living standard, refrigeration and air conditioning come into people's daily life, its energy consumption also accounts for a large proportion of the total energy consumption, and the refrigerant it uses will also have a negative impact on the environment. The international community is paying more and more attention to energy shortage and environmental protection. The efficient utilization of refrigeration and air conditioning energy and the substitution of refrigerants have become hot issues in the industry. Heat exchanger is one of the important equipments in refrigeration and air conditioning system. The accuracy of the simulation is very important for the optimization design of the heat exchanger itself and the whole refrigeration system and the reduction of energy consumption. Analysis of the performance of low GWP refrigerant air conditioning heat exchangers will be of theoretical significance for the research and substitution of environmental refrigerants. To sum up, the research work of this paper mainly has the following several items. Based on the existing research results at home and abroad, considering the pressure drop of refrigerant and the actual flow state, a mathematical model of steady distribution parameters of finned tube evaporator and condenser is established. The simulation program of finned tube evaporator and condenser is programmed by Visual Basic language, and the simulation software with friendly interface is developed. The flow and heat transfer characteristics of low GWP refrigerant R290 HFO1234yf and HFO1234ze in finned tube heat exchanger are simulated by this simulation software. The changes of heat transfer and pressure drop when the wind speed, refrigerant mass flow rate and diameter of the tube are changed are analyzed and compared with that of R410A, which is widely used now. The performance of finned tube evaporator and condenser was tested in R290 refrigeration system by using enthalpy differential heat balance chamber. The correctness of the model was verified by the test data. In addition, the model is validated by experimental data in the literature. It is proved that the model has certain precision and can be used to simulate the performance of finned tube heat exchanger. The steady-state distribution parameter model of parallel flow condenser which is widely used in automobile air conditioning is established and compared with the experimental data in literature. Finally, the flow and heat transfer characteristics of R134a and its potential alternative refrigerant HFO1234yf in parallel flow condenser are analyzed by using this model.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB657.2

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