發(fā)布時間：2018-04-19 16:22

  本文選題：空調(diào)水系統(tǒng) + 最不利熱力環(huán)路��； 參考：《大連理工大學(xué)》2013年碩士論文

【摘要】：隨著我國經(jīng)濟社會的高速發(fā)展,建筑能耗在社會總能耗的比例越來越大,己由2007年的24.5%增加到2012年的32%,而大型公共建筑能耗占建筑總能耗的22%,中央空調(diào)系統(tǒng)的耗電量占大型公共建筑總耗電量的50～60%,中央空調(diào)系統(tǒng)必將成為建筑節(jié)能的重點。在空調(diào)系統(tǒng)的實際運行中,首先,絕大多數(shù)的空調(diào)水系統(tǒng)末端沒有連續(xù)型電動調(diào)節(jié)閥,很難實現(xiàn)對空調(diào)水系統(tǒng)末端設(shè)備的調(diào)節(jié)控制,加大了水系統(tǒng)的輸送能耗。其次,空調(diào)水系統(tǒng)在啟動時間和啟動方式上相差很大,完全憑運行人員主觀經(jīng)驗啟�？照{(diào)系統(tǒng),缺乏科學(xué)的決策。另外,在許多變頻控制的空調(diào)水系統(tǒng)中,水泵變頻控制的依據(jù)---水系統(tǒng)壓差監(jiān)測點位置的選擇也多種多樣,導(dǎo)致空調(diào)水系統(tǒng)循環(huán)泵能耗大小不一。因此,針對上述問題,根據(jù)對實際空調(diào)系統(tǒng)檢測和診斷結(jié)果,以及空調(diào)水系統(tǒng)諸多問題的研究要求,建立通用的空調(diào)水系統(tǒng)智能控制試驗平臺。針對上述問題進行研究開發(fā),對降低空調(diào)系統(tǒng)運行能耗、建筑節(jié)能減排具有重要的學(xué)術(shù)和實用價值。 首先,本文針對某實際空調(diào)系統(tǒng)的檢測,針對空調(diào)水系統(tǒng)控制調(diào)節(jié)性問題,設(shè)計并建設(shè)了中央空調(diào)系統(tǒng)智能控制試驗平臺,包括空調(diào)水系統(tǒng)、電氣系統(tǒng)和網(wǎng)絡(luò)控制系統(tǒng)。在此基礎(chǔ)上對試驗臺各設(shè)備、管路、傳感器、執(zhí)行機構(gòu)等機電設(shè)備系統(tǒng)的特性進行測試分析,為后續(xù)的試驗研究工作奠定了試驗基礎(chǔ)。, 其次,本文引入空調(diào)水系統(tǒng)最不利水力環(huán)路和最不利熱力環(huán)路的概念,并進行了辨析,針對末端沒有閥位反饋的空調(diào)水系統(tǒng),提出了以房間溫度和供回水溫差為參考量的空調(diào)水系統(tǒng)最不利熱力環(huán)路辨識方法,通過試驗驗證了該方法的可行性。 第三,本文針對空調(diào)系統(tǒng)的啟動時間和啟動方式,試驗研究空調(diào)水系統(tǒng)并聯(lián)水泵啟動臺數(shù)和上班前預(yù)冷啟動時間,分析了空調(diào)水系統(tǒng)總體能耗大小,結(jié)果表明,針對本試驗系統(tǒng)中的兩臺并聯(lián)水泵,在預(yù)冷階段同時聯(lián)合啟動要比單獨啟動一臺時能耗要小。 最后,本文針對水泵變頻控制中壓差參考點的選擇進行了研究,試驗表明,壓差參考點設(shè)置在空調(diào)水系統(tǒng)主干管中間位置時,循環(huán)水泵的能耗最低。 上述問題為空調(diào)水系統(tǒng)在實際運行中普遍存在的共性問題,所研究的調(diào)節(jié)控制方法對實際空調(diào)水系統(tǒng)的運行調(diào)試具有較大的參考價值。
[Abstract]:With the rapid development of our country's economy and society, the proportion of building energy consumption in the total energy consumption of society is increasing.It has increased from 24.5% in 2007 to 32% in 2012, while the energy consumption of large public buildings accounts for 22% of the total energy consumption of buildings, and the power consumption of central air conditioning system accounts for 50% of the total energy consumption of large public buildings, so the central air conditioning system will become the focus of building energy saving.In the actual operation of air conditioning system, first of all, most of the air conditioning water system end no continuous electric control valve, it is difficult to achieve the air conditioning water system terminal equipment regulation control, increasing the energy consumption of water system.Secondly, there is a great difference in starting time and starting mode of air conditioning water system. It is completely based on the subjective experience of the operator to start and stop the air conditioning system, so it lacks scientific decision.In addition, in many air conditioning water systems controlled by frequency conversion, the selection of pressure difference monitoring points of water system based on frequency conversion control of water pump is various, which leads to different energy consumption of circulating pump in air conditioning water system.In view of the above problems, according to the test and diagnosis results of actual air conditioning system and the research requirements of many problems of air conditioning water system, a general intelligent control test platform for air conditioning water system is established.Aiming at the above problems, it is of great academic and practical value to reduce the energy consumption of air conditioning system and to save energy and reduce the emission of buildings.Firstly, the intelligent control test platform of central air conditioning system is designed and constructed, which includes air conditioning water system, electric system and network control system.On this basis, the characteristics of each equipment, pipeline, sensor, actuator and other electromechanical equipment system of the test bed are tested and analyzed, which lays the test foundation for the subsequent test research.Secondly, this paper introduces the concepts of the most unfavorable hydraulic loop and the most unfavorable thermal loop of the air conditioning water system, and analyzes it, aiming at the air conditioning water system with no valve feedback at the end.A method for identifying the most unfavorable thermal loop of air conditioning water system using room temperature and temperature difference between supply and return water as reference is proposed. The feasibility of this method is verified by experiments.Thirdly, aiming at the starting time and starting mode of air conditioning system, the paper studies the number of parallel water pump start-up units and pre-cooling start-up time before going to work, and analyzes the total energy consumption of air conditioning water system. The results show that,For the two parallel water pumps in this test system, the energy consumption of the two parallel pumps in the pre-cooling stage is lower than that in the single start-up stage.Finally, this paper studies the choice of reference point of pressure difference in variable frequency control of water pump. The experiment shows that when the reference point of pressure difference is set in the middle of the main pipe of air conditioning water system, the energy consumption of circulating water pump is the lowest.The above problems are the common problems in the practical operation of air conditioning water system, and the methods of regulating and controlling are of great reference value to the operation and debugging of air conditioning water system.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU831

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本文編號：1773830