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-> 行業(yè)資訊－ 翅片管是否越多越好？越高越好？
發(fā)布時間：(2018/9/22)
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翅片管是否越多越好？越高越好？ |
答案是否定的。并不是越多越好，也不是越高越好。原因如下：截至7月30日收盤，翅片管主力合約價格收于每噸3633元，成交驟降近20萬手至 141.2萬手。市場人士稱，銀行信貸緊張、負(fù)債率高企令翅片管業(yè)負(fù)重難行，期市翅片管成交量快速萎縮，預(yù)計資金面影響仍將壓制期價反彈。
The answer is No. Not the more, the better. The reason is as follows: as of July 30, the main contract price of finned tube closed at 3,633 yuan per ton, trading plunged nearly 200,000 hands to 1,142,000 hands. Market participants said that tight bank credit and high debt ratios make the finned tube industry difficult to carry the burden of rapid contraction in the futures market finned tube trading volume, expected capital impact will still suppress the price rebound.
對1米長的管子而言，設(shè)增加翅片以后的總傳熱面積為A，未增加翅片時的光管面積為A0,則A/A0 即為面積擴(kuò)大的倍數(shù)，稱為“翅化比”。選用多大的翅化比合適，要由應(yīng)用條件和優(yōu)化設(shè)計確定。一般，在能源工程上應(yīng)用的翅片管，其翅化比在 5---12 之間，而在空調(diào)，空冷行業(yè)，其翅化比在15—22 之間。
For a tube 1 m long, if the total heat transfer area after increasing fins is A and the area of the tube without increasing fins is A0, then A/A0 is the multiplier of the enlarged area, which is called "finning ratio". The choice of wing size ratio is appropriate, and it should be determined by application conditions and optimization design. Generally, finned tubes used in energy engineering have finning ratios between 5 and 12, while those used in air conditioning and air cooling industries have finning ratios between 15 and 22.
翅片管是否越多越好？越高越好？
Is the more finned tubes the better? The higher, the better?
1.當(dāng)翅片管的傳熱面積增加一倍時，其換熱系數(shù)并不能增加一倍，而是要打一個折扣，一般為（0.9---0.7），而且翅片越高，此折扣值越大，甚至降到（0.5）以下。這說明，翅片越高，翅片效率就越低，增加翅片的經(jīng)濟(jì)性就下降了。
1. When the heat transfer area of finned tube doubles, the heat transfer coefficient can not be doubled, but a discount, generally (0.9-0.7), is required. The higher the fin, the greater the discount, or even lower than (0.5). This shows that the higher the fin is, the lower the fin efficiency is, and the economic increase of the fin will decrease.
2.如果翅片太高太密，容易產(chǎn)生積灰問題，而且清灰困難。
2. if the fins are too high and too dense, it is easy to cause ash accumulation and difficult to remove dust.
3.翅片太高太密，會增加工藝難度，提高加工成本。
3. the fins are too high and too dense, which will increase the technological difficulty and improve the processing cost.辛苦整理.轉(zhuǎn)載請注明http://www.wxsxsjx.com
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