本文關鍵詞：毛細管重力循環(huán)供冷末端設備性能研究　出處：《天津商業(yè)大學》2013年碩士論文　論文類型：學位論文

  更多相關文章： 毛細管網 重力循環(huán)供冷末端裝置 補助制冷 供冷特性

【摘要】：降低以供冷為主的建筑能耗，利用地表水和可再生能源等高溫能源供冷，實現(xiàn)能源的階梯利用是目前建筑能源領域的研究課題之一。風機盤管聯(lián)合新風、全空氣等空調系統(tǒng)形式在現(xiàn)代建筑中被廣泛采用，通過空氣對流的形式進行熱量交換，室內溫度分布容易出現(xiàn)不均勻性，而且會造成能源的巨大浪費。輻射空調供冷方式作為一種新型、節(jié)能的空調方式，以毛細管為換熱元件，利用16~18℃冷水進行供冷，能夠有效利用低品位能源。 當房間維護結構的保溫措施做得比較好時，對于人員活動量比較小的房間，輻射空調方式有可能能夠滿足負荷要求，不需要額外的補助制冷方式。但是，在大部分情況下，供冷過程中輻射板的供冷能力受結露風險以及室內吊頂空間的限制，輻射吊頂不能完全消除室內顯熱負荷。當房間由于某種需要人員突然增多時，室內的負荷會相應跟著突然增大，由于輻射空調系統(tǒng)的降溫速度較慢，也需要補助制冷方式進行加速降溫處理。 在增加輻射空調末端制冷量的措施中，大都圍繞改變輻射板本身的結構的研究，在板表面進行一些技術處理，通過防結露的措施達到增加制冷量的目的。然而，此舉雖有效的提高了輻射板的供冷能力，但是仍不能達到單依靠輻射板消除全部室內負荷的效果。 重力柜是將毛細管網置于特殊制作的柜殼中，柜殼外表面上下開風口，依靠循環(huán)柜內空氣與室內空氣的密度差，室內與循環(huán)柜之間形成僅依靠熱壓作用的空氣自然對流循環(huán)，達到降低室溫的目的。 本文在設備結構參數(shù)的優(yōu)化研究中，通過Fluent數(shù)值模擬的方法得到設備的溫度場分布特性，分析了設備內置毛細管網的管間距、管排數(shù)以及安裝位置等參數(shù)對溫度場、冷量的影響，以及室內流場分布情況。 在設備的運行特性研究中，實驗方法研究重力柜的供冷能力以及重力柜壁面盤管的冷量貢獻率，使用吊頂輻射供冷系統(tǒng)時，在某些地區(qū)，當?shù)蹴斴椛洳荒芡耆覂蓉摵�，或者當房間負荷突然增加，室內溫度不能快速有效得到控制時，重力柜作為補助制冷設備起到補充冷量的作用，實驗方法研究重力柜的補助制冷性能以及對室內熱舒適性的影響。 研究結果表明：重力柜內置毛細管網管間距為20mm、管排數(shù)由1排增加到2、3排時，冷量由218.4W增加到430.1W、737.6W，能夠顯著提高重力柜的供冷性能；當內置1排毛細管網、管間距由30mm、減小到20mm、10mm時，冷量由197.4W增加到249.7W；重力柜厚度為150mm、內置1排毛細管網、管間距為20mm時，與后壁面、風口面距離分別為60、85.7mm時，冷量值達到最大218.4W。 當重力柜內置3排毛細管、入口速度為0.15m/s時，出風口冷空氣的影響范圍達到重力柜風口前方1.9m處；由于出風口周圍地面的溫度比較低，出風口周圍的地板結構具有蓄冷作用，使得地面以輻射、對流形式消除部分室內負荷，一定時間內也能維持供冷效果。由此可知，重力柜具有部分輻射供冷的效果。 重力柜聯(lián)合吊頂輻射板運行時，在室內達到穩(wěn)定狀態(tài)后，，距重力柜水平0.3m以內的區(qū)域，最大垂直溫差達到3.5℃；0.3m以外的區(qū)域，人體活動區(qū)溫度梯度在0.9-2.6℃內，符合ASHRAE手冊中人體熱舒適性標準的要求。因此建議采用重力循環(huán)系統(tǒng)形式時，將人員活動區(qū)設在距離重力柜水平0.8m以外的區(qū)域，由PMV和PPD值分析得知，重力柜對室內熱舒適性沒有影響。
[Abstract]:In order to reduce the cooling of the building energy consumption, the use of surface water and renewable energy such as high temperature and cooling energy, realize the energy ladder use is one of the research topics at present in the field of building energy. The fan coil combined with fresh air, the air conditioning system in the form of modern architecture is widely adopted by air convection in the form of heat exchange, indoor temperature distribution is not prone to uniformity, and will cause a huge waste of energy. The radiation cooling mode as a new type of air conditioning, energy saving, with capillary tube as heat transfer components, cooling by 16~18 C cold water, can effectively use the low grade energy.
When the room maintenance structure heat preservation measures are doing better, for a relatively small amount of personnel activity room, radiation air conditioning system has the potential to meet the load requirements, do not need to grant additional cooling. However, in most cases, the risk of condensation and cooling capacity by indoor ceiling space limit radiation panel cooling in the process of radiant ceiling can not completely eliminate indoor sensible heat load. When the room due to a sudden increase in the need for personnel, the indoor load will follow a sudden increase due to radiation air conditioning system cooling speed is slow, also need to grant cooling accelerated cooling treatment.
The increase in end radiation air conditioning refrigeration volume measures, mostly centered on the change of structure of the radiation plate itself, some technical process on the surface of the plate, through the condensation prevention measures to increase the cooling capacity. However, although this can effectively improve the cooling capacity of the radiation plate, but still can not achieve the single rely on radiation in eliminating all indoor load effect.
The gravity cabinet is to place capillary net in the special cabinet, and the outer surface of the cabinet is opened up and down, and the air density of the air in the circulation cabinet is different from that of the indoor air. Indoor air circulation is formed between the indoor cabinet and the circulation cabinet, and the natural convection circulation is only achieved by hot pressing, so as to achieve the purpose of reducing the room temperature.
Study on Optimization of structural parameters of the equipment in this paper, the temperature field distribution equipment is obtained through Fluent simulation, analysis of the tube spacing device with built-in capillary network, the number of tube rows and the installation position and other parameters on the temperature field, the effects of cold quantity, and indoor air flow distribution.
The operation characteristics of the equipment, the cooling capacity with cooling capacity of experimental methods to study the gravity tank and gravity tank wall coil, use ceiling radiant cooling system, in some areas, when the ceiling radiation cannot completely eliminate indoor load, or when a sudden increase in room load, the indoor temperature can not be controlled effectively when the gravity tank as subsidies to refrigeration equipment cooling capacity, cooling performance allowance experiment method to study the gravity tank and the influence of indoor thermal comfort.
The results show that: gravity capillary network cabinet built-in distance is 20mm, the tube row number of rows increases from 1 to 2,3, the cooling capacity increased from 218.4W to 430.1W, 737.6W, can significantly improve the cooling performance of the gravity tank; when the built-in 1 rows of capillary network, tube spacing by 30mm, reduced to 20mm, 10mm. The cooling capacity increased from 197.4W to 249.7W; gravity tank thickness is 150mm, built in 1 rows of capillary network, tube spacing is 20mm, and after the wall outlet surface distance is 60,85.7mm, the cooling capacity reaches the maximum value of 218.4W.
When the gravity tank built in 3 rows of capillary entrance velocity is 0.15m/s, the influence of cold air to air outlet at the gravity tank in front of 1.9m; for the air outlet of the surrounding ground temperature is relatively low, the floor structure around the air inlet with cold storage function, which makes the ground to radiation, convection eliminate indoor load, a certain period of time also can maintain the cooling effect. Therefore, the gravity part cabinet has radiation cooling effect.
Gravity tank combined with radiation board operation, to reach a steady state in the room, from within the gravity tank level of 0.3m area, the maximum vertical temperature difference reaches 3.5 DEG 0.3m; the area outside the area of human activities, the temperature gradient at 0.9-2.6 DEG C, in line with the ASHRAE Manual of human thermal comfort standards. It is proposed to use the gravity circulation the form of system, the personnel activity area is located in the distance from the gravity tank level 0.8m area by PMV and PPD value analysis shows that the gravity tank on indoor thermal comfort has no effect.

【學位授予單位】：天津商業(yè)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU831.4

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