發(fā)布時間：2018-05-02 11:51

  本文選題：土壤源熱 + 泵系統(tǒng)累計冷熱��； 參考：《華中科技大學(xué)》2013年碩士論文

【摘要】：近年來，節(jié)能環(huán)保的地源熱泵系統(tǒng)成為人們關(guān)注的焦點。夏熱冬冷地區(qū)冷熱負(fù)荷的不平均導(dǎo)致了土壤源熱泵系統(tǒng)存在熱積累，而帶有輔助散熱裝置的土壤源熱泵系統(tǒng)在理論上可有效的解決這一問題。目前，國內(nèi)常用的兩種系統(tǒng)形式是：地埋管-冷卻塔混合式土壤源熱泵系統(tǒng)和土壤源熱泵-冷水機組聯(lián)合運行系統(tǒng)。但實際工程中，由于設(shè)計、施工等原因，系統(tǒng)仍舊存在一定程度的熱積累。并且，國內(nèi)頻頻將地源熱泵系統(tǒng)應(yīng)用于大型公建工程中，這類建筑的“內(nèi)區(qū)”冬季仍需供冷，建筑冬夏累計冷熱負(fù)荷差更大。因此大型公共建筑冷熱負(fù)荷的累計冷熱負(fù)荷比對土壤源熱泵系統(tǒng)的性能參數(shù)影響值得探究。 本文選取武漢某一辦公樓建筑為對象，利用DeST-C模擬建筑全年動態(tài)冷熱負(fù)荷。以此辦公樓為原型，通過擴大或縮小單層面積以及改變層數(shù)，得到大小不同的建筑面積和相應(yīng)的累計冷熱負(fù)荷比。為了研究的目的，這些累計冷熱負(fù)荷比的間隔是相對均勻的。利用TRNSYS對不同累計冷熱負(fù)荷比下兩種系統(tǒng)進行了20年仿真模擬，分析各種累計冷熱負(fù)荷比模型下土壤平均溫度變化趨勢和熱泵系統(tǒng)（包括熱泵機組、冷水機組、冷熱源側(cè)水泵和冷卻塔）的能耗狀況，比較單位能耗（系統(tǒng)獲得每千瓦的冷量或熱量所需電能）以獲得系統(tǒng)的經(jīng)濟性評價。 以土壤源熱泵系統(tǒng)20年的土壤平均溫度和單位能耗兩項指標(biāo)為依據(jù)，分析總結(jié)出以下結(jié)論： （1）對于地埋管-冷卻塔混合式土壤源熱泵系統(tǒng)，由于熱積累效應(yīng)，熱泵系統(tǒng)隨著累計冷熱負(fù)荷比的增加，土壤平均溫升更大，速度更快，熱泵進口溫度也越高，單位能耗增加，熱泵系統(tǒng)運行費增加。 （2）對于土壤源熱泵-冷水機組聯(lián)合運行系統(tǒng)，如按照冬夏承擔(dān)峰值負(fù)荷相等的方法進行熱泵系統(tǒng)設(shè)計，土壤熱積累現(xiàn)象極其嚴(yán)重，建議按照冬夏累計排熱量和取熱量相等的方法進行設(shè)計。這種設(shè)計方法下，土壤熱積累現(xiàn)象明顯小于地埋管-冷卻塔混合式土壤源熱泵系統(tǒng)。 （3）同樣的累計冷熱負(fù)荷比情況下，土壤源熱泵-冷水機組聯(lián)合運行系統(tǒng)與地埋管-冷卻塔混合式土壤源熱泵系統(tǒng)相比單位能耗較小，初投資較大。若綜合考慮系統(tǒng)初投資和運行費的話，土壤源熱泵-冷水機組聯(lián)合運行系統(tǒng)獲得每千瓦的冷量或熱量花費較少。 本文在分析累計冷熱負(fù)荷比對兩種土壤源熱泵系統(tǒng)性能參數(shù)的影響的基礎(chǔ)上，，給出了兩種系統(tǒng)的經(jīng)濟性分析，為其進一步的推廣應(yīng)用提供一定的參考。
[Abstract]:In recent years, energy-saving and environmental-friendly ground-source heat pump system has become the focus of attention. The uneven heat and cold loads in hot summer and cold winter area lead to the existence of heat accumulation in the ground-source heat pump system, and the ground-source heat pump system with auxiliary heat dissipation device can effectively solve this problem in theory. At present, two kinds of systems are commonly used in our country: the hybrid ground source heat pump system with buried pipe and cooling tower and the combined operation system of ground source heat pump and water chillers. However, the system still has a certain degree of heat accumulation due to design, construction and other reasons in practical engineering. In addition, the ground-source heat pump system is frequently used in large-scale public construction projects in China. The "inner zone" of this kind of building still needs to be cooled in winter, and the accumulated cold and heat load difference in winter and summer is even greater. Therefore, the influence of accumulative cold and heat load ratio of large public buildings on the performance parameters of ground-source heat pump system is worth exploring. In this paper, an office building in Wuhan is selected as an object, and DeST-C is used to simulate the annual dynamic cooling and heat load. By enlarging or reducing the single-layer area and changing the number of floors, the different building area and the corresponding cumulative cold and heat load ratio can be obtained by using this office building as a prototype. For the purposes of the study, the intervals between these accumulative cold and heat load ratios are relatively uniform. Two kinds of systems with different accumulative cold and heat load ratios were simulated by TRNSYS for 20 years. The variation trend of soil average temperature and the heat pump system (including heat pump unit, chiller unit) were analyzed under various accumulative cold and heat load ratio models. The energy consumption of water pumps and cooling towers on the side of cold and heat sources is compared to the energy consumption per kilowatt, which is required by the system to obtain the economic evaluation of the system. Based on the two indexes of average soil temperature and unit energy consumption of the GSHP system for 20 years, the following conclusions are concluded: (1) for a ground-buried tube-cooling tower hybrid ground-source heat pump system, due to the effect of heat accumulation, with the increase of the accumulative ratio of cold and heat load, the average temperature of the ground temperature rises more rapidly, and the inlet temperature of the heat pump is also higher, and the unit energy consumption increases. The operating cost of heat pump system is increased. 2) for the combined operation system of ground-source heat pump and chiller, if the heat pump system is designed according to the method of equal peak load in winter and summer, the phenomenon of ground heat accumulation is extremely serious. It is suggested that the design should be carried out according to the equal method of summertime and summertime accumulative heat discharge. Under this design method, the phenomenon of soil heat accumulation is obviously smaller than that of hybrid ground source heat pump system with buried pipe and cooling tower. 3) under the same accumulative cold and heat load ratio, the combined operation system of ground-source heat pump and chillers is less energy consumption and larger initial investment than the hybrid ground-source heat pump system with buried tube-cooling tower. If the initial investment and operating cost of the system are taken into account, the combined operation system of ground-source heat pump and water chiller can achieve less cooling or heat cost per kilowatt. On the basis of analyzing the effect of accumulative cold and heat load ratio on the performance parameters of two kinds of ground-source heat pump systems, this paper gives the economic analysis of the two systems, which provides a certain reference for its further popularization and application.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU83

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李愷淵;王景剛;;冷卻塔輔助冷卻地源熱泵技術(shù)經(jīng)濟分析[J];建筑節(jié)能;2007年01期

2 張勇;王晏平;陳正順;;混合式地源熱泵控制方法分析[J];建筑節(jié)能;2009年02期

3 張時聰;徐偉;;國際地源熱泵技術(shù)發(fā)展及工程應(yīng)用情況[J];工程建設(shè)與設(shè)計;2007年03期

4 陳友明;李季勛;;夏季新型混合地源熱泵系統(tǒng)經(jīng)濟性分析[J];湖南大學(xué)學(xué)報(自然科學(xué)版);2009年S2期

5 王松慶;張旭;鮑謙;劉俊;高軍;;負(fù)荷不平衡率對不同地埋管布置形式下土壤溫度場影響的研究[J];建筑科學(xué);2010年08期

6 楊衛(wèi)波;施明恒;;混合地源熱泵系統(tǒng)(HGSHPS)的研究[J];建筑熱能通風(fēng)空調(diào);2006年03期

7 徐偉;;《中國地源熱泵發(fā)展研究報告》(摘選)——國際國內(nèi)地源熱泵技術(shù)發(fā)展[J];建設(shè)科技;2010年18期

8 宋著坤;趙軍;李新國;黃濤;;地源熱泵冬夏兩季運行性能分析與實驗研究[J];流體機械;2006年02期

9 余延順;馬娟;;負(fù)荷分布對地源熱泵系統(tǒng)長期運行特性的影響[J];南京理工大學(xué)學(xué)報;2011年02期

10 王勇;付祥釗;;影響地源熱泵系統(tǒng)牲能的負(fù)荷特征與特征參數(shù)[J];暖通空調(diào);2008年05期

本文編號：1833753