發(fā)布時間：2018-02-09 09:27

  本文關鍵詞： 地埋管直供 輻射供冷 置換通風 控制策略 能耗預測　出處：《山東建筑大學》2017年碩士論文　論文類型：學位論文

【摘要】：地板輻射供冷耦合置換通風系統(tǒng)的空調技術比較成熟,但是在國內非常成功的應用實例并不常見。該系統(tǒng)最大的優(yōu)點是能夠實現(xiàn)冬夏共用同一套末端裝置,節(jié)省投資費用。其次,系統(tǒng)的舒適性也較好,冬季能夠實現(xiàn)“頭冷腳暖”的空調環(huán)境,夏季通過置換通風將室內的空氣均勻混合,減小垂直方向上的溫度分層,維持室內空氣品質良好。但是這種復合空調系統(tǒng)需要精確的控制系統(tǒng),實時監(jiān)測并調控室內溫濕度,避免地板表面結露,還要考慮樓板的熱惰性及溫度延遲現(xiàn)象。在盡量減少能耗的基礎上達到更佳的空調效果是本文研究的目的。本文以地埋管直供條件下的地板輻射供冷空調系統(tǒng)為研究對象,以濟南安泰智能工程有限公司辦公樓的空調系統(tǒng)為模型,以TRNSYS能耗仿真模擬軟件為工具,通過實驗和模擬相結合的手段,對該空調系統(tǒng)的控制運行策略和室內環(huán)境狀況進行了分析研究。在輻射供冷與置換通風聯(lián)合的條件下,通過對該辦公建筑中五樓室內溫度的實時監(jiān)測,以及對實驗數(shù)據(jù)的大量分析,總結出室內溫度分布規(guī)律為垂直方向上明顯的溫度分層。這對進一步分析房間溫度在空間垂直方向上變化趨勢有較大的幫助。對于地板輻射,當供水流量為工程經(jīng)驗值20000kg/h,分水器將總的供水量平均分配到每一層時,各樓層溫度存在明顯差異,并不是所有房間的溫度都能達到空調設計要求,常有高于27℃的情況。對此,提出供水流量根據(jù)室溫反饋進行按比例調節(jié)的方案,并且通過模擬發(fā)現(xiàn)該方案能夠有效緩解各樓層溫度不均的現(xiàn)象。對于地板輻射供冷系統(tǒng)中常常會出現(xiàn)的地板結露現(xiàn)象,針對常用避免結露的兩種方法(保持相對濕度不變的情況下,降低環(huán)境空氣溫度使其露點溫度小于地板表面溫度;在相同送風溫度的條件下,降低送風濕度)通過模擬實驗發(fā)現(xiàn)在地板輻射與置換通風相結合的空調系統(tǒng)中降低置換通風的相對濕度是避免地板結露最有效的方法。通過分析夏季室內溫度的變化情況,針對異常高溫天氣提出了一種新的控制策略,并對此展開了模擬研究:通過預測室外溫度,提前對地源井供水總流量進行控制。該方案雖然可以起到緩沖室內溫度大幅度升降的作用,但是由于輻射地板的熱惰性使得供冷量與供水流量變化并不成正比,而且這樣還會造成機組與泵的能耗增加。預判方案的提出雖然沒有解決異常天氣對室溫的影響,卻也證實了蓄熱地板良好的穩(wěn)定性。從本實驗方案的提出至驗證其不足的過程中,證實了地埋管直供復合空調系統(tǒng)中改變供水流量對室內溫度環(huán)境狀況影響較小,對下一步的控制策略優(yōu)化會有很大的指導意義。
[Abstract]:The air conditioning technology of floor radiation cooling coupled displacement ventilation system is quite mature, but it is not very common in China for very successful applications. The biggest advantage of this system is that it can share the same terminal device in winter and summer. Second, the comfort of the system is better. In winter, the air conditioning environment of "head cold foot is warm" can be realized. In summer, the indoor air is mixed evenly by displacement ventilation, and the vertical temperature stratification is reduced. Maintain good indoor air quality. But this composite air conditioning system requires accurate control system, real-time monitoring and control of indoor temperature and humidity, to avoid floor surface dew, The purpose of this paper is to achieve better air conditioning effect on the basis of reducing energy consumption as far as possible. In this paper, the floor radiant cooling air conditioning system under the condition of direct supply of underground pipes is taken as the research object. Taking the air conditioning system of the office building of Jinan Antai Intelligent Engineering Co., Ltd as the model, and using the TRNSYS energy consumption simulation software as the tool, the method of combining experiment and simulation is adopted. The control operation strategy and indoor environment condition of the air conditioning system are analyzed and studied. Under the condition of radiation cooling and displacement ventilation, the indoor temperature of the fifth floor of the office building is monitored in real time. By analyzing a large number of experimental data, it is concluded that the indoor temperature distribution is obviously stratified in the vertical direction, which is helpful for further analysis of the change trend of room temperature in the space vertical direction, and for floor radiation, When the water supply flow is an engineering experience value of 200kg / h and the water separator distributes the total water supply equally to each floor, there is a significant difference in the temperature of each floor, and not all rooms can meet the requirements of air conditioning design, and often the temperature is higher than 27 鈩，

本文編號：1497608