本文關(guān)鍵詞：冷卻塔復合式地源熱泵系統(tǒng)控制策略研究及實現(xiàn)　出處：《東華大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 冷卻塔 地埋管 地源熱泵 自動控制 LabVIEW

【摘要】：節(jié)能已經(jīng)成為建筑業(yè)每年都要推進的強制性工作�？照{(diào)系統(tǒng)的節(jié)能是建筑節(jié)能中一個迫切需要解決的問題。近年來,地源熱泵空調(diào)系統(tǒng)以其突出的環(huán)保和節(jié)能特性,得到了廣泛的應用。但在系統(tǒng)的實際運行中,當夏季排至土壤中的熱量大于冬季從土壤中吸收的熱量時,就會產(chǎn)生熱堆積效應,使土壤溫度逐年升高,與地源熱泵系統(tǒng)的換熱溫差也逐漸偏離穩(wěn)定數(shù)。土壤溫度的升高對機組的2和制冷效率都有非常大的影響,因此解決熱堆積問題對土壤源熱泵系統(tǒng)的正常運行十分關(guān)鍵。 冷卻塔復合式地源熱泵系統(tǒng)即把地源熱泵系統(tǒng)與冷卻塔結(jié)合使用的系統(tǒng)形式,此方法可有效的改善地源熱泵系統(tǒng)的運行性能,減少地埋管數(shù)量減少占地面積,平衡地埋管選題全年的放熱量和吸熱量,解決土壤的熱積聚問題,使地源熱泵系統(tǒng)的優(yōu)越性能得到充分的發(fā)揮。 由于冷卻塔復合式地源熱泵系統(tǒng)組成復雜,人工控制操作誤差較大,不能充分發(fā)揮冷卻塔復合式地源熱泵系統(tǒng)節(jié)能高效的優(yōu)勢。為了解決目前冷卻塔復合式地源熱泵系統(tǒng)在運行控制方面存在的問題,本文提出了一種新的冷卻塔和地埋管系統(tǒng)復合運行的控制策略,并開發(fā)了一套能夠有效實現(xiàn)相應控制軟件。 首先對冷卻塔復合式地源熱泵系統(tǒng)控制策略進行分析比較。國內(nèi)外學者對冷卻塔復合式地源熱泵系統(tǒng)進行了大理的模擬研究,得出了三種常用控制策略：冷卻塔開啟時間控制、熱泵熱源側(cè)進(出)口流體最高溫度控制、地埋管換熱器進(出)水溫度與室外空氣濕球溫度的溫差控制。在總結(jié)前人的研究成果的基礎(chǔ)上,為了充分利用有利的室外空氣條件,本文提出了如下控制策略：在制冷季初期和末期冷卻塔單獨運行,在制冷季中期采用地埋管換熱器進(出)水溫度與室外空氣濕球溫度的溫差控制方式進行冷卻塔和地埋管系統(tǒng)的復合運行。 其次對冷卻塔的數(shù)學模型進行分析。根據(jù)Merkel首先建立的冷卻塔的熱焓平衡方程式,類比于顯熱換熱器的效能-傳熱單元數(shù)法計算公式,利用迭代計算得到的冷卻塔出水溫度。但結(jié)果精度不能滿足自動控制系統(tǒng)的要求,因此選用直接影響冷卻塔出水溫度的室外空氣濕球溫度作為控制參數(shù)。 然后在理論研究基礎(chǔ)上,本課題組搭建了一個冷卻塔復合式地源熱泵實驗平臺。并根據(jù)該實驗平臺昀具體情況,設(shè)計了一套以傳感器和執(zhí)行機構(gòu)為現(xiàn)場元件層、PLC控制器和單回路控制器為控制層、Lab VIEW上位機軟件為管理層的三層網(wǎng)絡控制方案,對整個控制系統(tǒng)硬件和各控制層之間的數(shù)據(jù)交換進行整體設(shè)計、調(diào)試。 再次,根據(jù)所確定的控制策略和現(xiàn)有實驗平臺開發(fā)了一套可視化程度高、使用方便的冷卻塔復合式地源熱泵自動控制軟件。該軟件能對系統(tǒng)的運行參數(shù)實時監(jiān)測;能對系統(tǒng)的運行參數(shù)進行設(shè)定和調(diào)控;能對空調(diào)系統(tǒng)溫度超限、系統(tǒng)故障進行報警提示;并能將系統(tǒng)數(shù)據(jù)實時顯示、儲存及打印。 最后,對冷卻塔復合式地源熱泵自動控制系統(tǒng)的硬件配合和軟件控制進行了現(xiàn)場調(diào)試和分析,得出該控制系統(tǒng)運行穩(wěn)定,系統(tǒng)數(shù)據(jù)的采集、顯示、等都運行正常。該系統(tǒng)能根據(jù)地埋管出水溫度和室外濕球溫度的變化自動調(diào)節(jié)冷卻塔和地埋管系統(tǒng)的運行方式,通過設(shè)定適當?shù)倪\行參數(shù),可以是冷卻塔和地埋管系統(tǒng)有機的配合運行,有效降低冷卻水溫度,達到提升機組性能、緩解地下土壤熱不平衡的作用。
[Abstract]:Energy saving has become mandatory in architectural industry every year. To promote energy-saving air-conditioning system is an urgent need to address the issue of building energy conservation. In recent years, ground source heat pump air conditioning system with environmental protection and energy saving characteristics of its outstanding, has been widely used. But in the actual operation of the system, when the summer came to the soil heat is greater than that in winter the heat absorbed from the soil, will produce the heat accumulation effect, the soil temperature increased year by year, and the temperature difference of ground source heat pump system also deviates from the stability number. The rise of soil temperature on the unit has a very large impact on 2 and cooling efficiency, so to solve the problem of heat accumulation the normal operation of GSHP system is very important.
The cooling tower HGSHP that GSHP system with cooling tower system combined with the form of use, this method can improve the performance of GSHP system running effectively, reduce the number of buried pipe to reduce the area, balance of heat and heat absorption on buried pipe topics throughout the year, to solve the problem of soil heat accumulation, the superior performance of the ground source the heat pump system into full play.
Because the cooling tower HGSHP complex, manual control error is large, can not give full play to the advantages of the cooling tower HGSHP energy efficient. In order to solve the cooling tower HGSHP in operation control problems, this paper proposes a new operation system of composite pipe cooling tower and ground control strategy, and developed a set of effective realization of the corresponding control software.
The control strategy of the cooling tower HGSHP were analyzed and compared. The domestic and foreign scholars have conducted research on the simulation of cooling tower of Dali HGSHP, obtained three kinds of control strategies: cooling tower opening time control, heat pump side into (out of) the highest temperature is in fluid control, ground heat exchanger inlet (outlet) temperature difference between water temperature and outdoor air wet bulb temperature control. On the basis of previous research on the outdoor air in order to make full use of favorable conditions, this paper puts forward the following control strategies: running alone in the cooling season at the beginning and end of the cooling tower in the middle of season, refrigeration by heat exchanger in (a) temperature control mode of water temperature and outdoor air wet bulb temperature of the composite pipe system cooling tower and ground.
Secondly, analysis on the cooling tower. The mathematical model of enthalpy balance equation of cooling tower is established based on Merkel's formula of effectiveness in analogy to the sensible heat exchanger number of heat transfer unit, cooling tower outlet temperature calculated by iteration. But the accuracy can not meet the requirements of automatic control system, so the the direct effect of cooling tower outlet temperature of outdoor air wet bulb temperature as control parameters.
Then on the basis of theoretical research, the research group set up a cooling tower for hybrid ground source heat pump experimental platform. Based on the experimental platform of Yun specific situation, a set of sensor and actuator field element layer design, PLC controller and single loop controller for the control layer, Lab VIEW PC software for management the three layer network control scheme, the hardware of the whole control system between the data exchange layer and the control of the overall design, debugging.
Again, according to the control strategy and the existing experimental platform for the development of a set of high degree of visualization, automatic control software using cooling tower hybrid ground source heat pump is convenient. The software can monitor the operating parameters on the system; to the system operation parameter setting and control; air conditioning system to the temperature gauge, system failure alarm; and can be real-time display system of data storage and printing.
Finally, the hardware and software control automatic control system of cooling tower composite GSHP on-site debugging and analysis, the control system is stable, the system of data acquisition, display, such as normal operation. The system can according to the change of water temperature of buried pipe and outdoor wet bulb temperature automatic control and cooling tower the underground pipe system operation mode, operation by setting appropriate parameters, can be run with the organic system of pipe cooling tower and ground, effectively reduce the temperature of the cooling water, improve the unit performance, ease the underground soil heat balance effect.

【學位授予單位】：東華大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU83

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本文編號：1396949