本文選題：混凝土輻射供暖系統(tǒng) + 蓄放熱特性　； 參考：《清華大學》2015年碩士論文

【摘要】：混凝土輻射空調系統(tǒng)作為一種區(qū)別于傳統(tǒng)對流空調系統(tǒng)的空調方式,在住宅供暖、大空間供冷供暖等領域得到廣泛應用�；炷凛椛淇照{系統(tǒng)的末端是具有較大熱慣性的混凝土,且具有較大的鋪設面積。穩(wěn)態(tài)情況下,混凝土輻射末端主要以長波輻射換熱形式與室內換熱,且對人體具有較大的角系數(shù);在室內外條件發(fā)生較大變化或者間歇供熱等情況下,混凝土輻射末端良好的蓄放熱特性會平抑室內熱環(huán)境的波動,維持室內熱環(huán)境的恒定。目前,輻射末端與對流末端的比較多以模擬計算為主,同時混凝土建筑蓄熱的研究較多忽略了蓄放熱特性對室內熱環(huán)境的影響,混凝土熱慣性和相應熱源結合的應用案例和計算較少。本論文主要針對上述問題展開研究,對混凝土輻射供暖房間和傳統(tǒng)對流末端供熱房間的熱舒適性和負荷進行了對比,對混凝土末端的慣性利用及相應熱源匹配展開相關研究。通過分塊離散混凝土輻射末端的方式,考慮混凝土埋管內流動熱媒的溫度變化,建立起混凝土末端的準二維傳熱模型;通過狀態(tài)空間法對圍護結構進行離散劃分,建立起整個圍護結構的矩陣傳熱方程。將混凝土末端傳熱模型和圍護結構傳熱模型聯(lián)立,可以對混凝土輻射末端供暖房間進行穩(wěn)態(tài)計算和非穩(wěn)態(tài)計算。提出了圍護結構等效熱損失溫度的概念,在等效熱損失溫度和人體操作溫度的基礎上利用相對變化系數(shù)△t_(loss)/△t_(op)比較末端穩(wěn)態(tài)傳熱性能,末端較小的相對變化系數(shù)△t_(loss)/△t_(op)對應末端在相同的操作溫度情況下房間負荷較低。針對混凝土輻射末端的慣性利用和熱源匹配形式,選取了兩個應用案例進行研究。將混凝土輻射末端與城市集中熱網(wǎng)結合,并采用合適的通斷控制策略,可以最大限度降低供熱系統(tǒng)回水溫度,提高系統(tǒng)能源利用效率。將混凝土輻射末端與太陽能熱源結合組成分散式太陽能供暖系統(tǒng),應用在太陽能資源豐富的青藏高原地區(qū),房間溫度可以在全天保持在17℃以上,且室內溫度波動較少,供暖效果良好;利用動態(tài)熱阻對分散式供暖系統(tǒng)的傳熱過程進行了研究,提出了運行改進的相關優(yōu)化策略。
[Abstract]:As a kind of air conditioning system different from the traditional convection air conditioning system, the concrete radiation air conditioning system has been widely used in residential heating, large space cooling heating and other fields. The end of the concrete radiative air conditioning system is the concrete with large thermal inertia, and has a large laying area. Under steady state, the radiation end of concrete is mainly in the form of long wave radiation heat transfer and indoor heat transfer, and has a large angle coefficient to the human body, in the case of large change of indoor and outdoor conditions or intermittent heating, etc. The good heat storage and exothermic property of the radiation end of concrete will restrain the fluctuation of indoor thermal environment and maintain the stability of indoor thermal environment. At present, the comparison between the radiation end and the convection end is mainly based on the simulation calculation, and the research on the heat storage of concrete buildings neglects the influence of the heat storage and exothermic characteristics on the indoor thermal environment. The application and calculation of concrete thermal inertia and corresponding heat source are few. In this paper, the thermal comfort and load of the concrete radiant heating room and the traditional convection end heating room are compared, and the inertia utilization of concrete end and the corresponding heat source matching are studied. The quasi-two-dimensional heat transfer model of concrete end is established by taking into account the temperature change of flowing heat medium in concrete pipe, the state space method is used to divide the enclosure structure, and the heat transfer model of concrete end is established by dividing the radiating end of concrete into blocks and considering the temperature change of flowing heat medium in concrete pipe. The matrix heat transfer equation of the whole envelope structure is established. The heat transfer model of concrete end and the heat transfer model of enclosure structure can be used to calculate the steady and unsteady state of concrete radiating end heating room. In this paper, the concept of equivalent heat loss temperature of enclosure structure is proposed. Based on the equivalent heat loss temperature and the operating temperature of human body, the steady-state heat transfer performance of the end is compared by using the relative coefficient of variation t _ (loss) / t _ (op). The relative coefficient of variation (t _ (loss) / t _ (op) corresponding to the lower end is lower room load at the same operating temperature. Aiming at the inertial utilization and heat source matching of the radiation end of concrete, two application cases are selected to study. Combining the radiation end of the concrete with the urban centralized heat network and adopting the appropriate on-off control strategy, the backwater temperature of the heating system can be minimized and the energy utilization efficiency of the system can be improved. A distributed solar heating system is formed by combining the radiation ends of concrete with solar heat sources. The system is applied to the Qinghai-Tibet Plateau, where solar energy resources are abundant. The room temperature can be kept above 17 鈩，

本文編號：2088191