久久狼啪_午夜欧美精品久久久久久久国产片_精品偷拍A片综合网站_丰满熟妇影院_一区二日韩久久精品_欧美日本熟女 视频_精品久中文网_人妻丰满熟妇av无码区乱,精品久久久久久无码专区不卡,久久久无码人妻精品无码_涩久久天堂_中文字幕91在线观看_日韩精品久久九_欧美一区二区三区视频播放_久久久久久久久久久久久659,午夜福利理论片高清在线,亚洲日韩欧美综合,天美传媒后妈儿子,免费羞羞午夜爽爽爽视频,国产在线精品一区二区在线看,部毛片片免费观看,亚洲国产av深夜福利,午夜影院视费看,亚洲中文字幕精品无码久久,婷婷成人基地,欧美日韩性生活片,久久爱电影,国产精品户露在线户外直播 ,亚洲欧美国产精品一区,舌头添高潮级毛片,欧美精品亚洲天堂,久久久久久久久麻豆,含羞草传媒免费观看视频,国产成人综合一区二区,国产亚洲精品成人A片麻豆,黄色成人一级片,国产精品久久久久5252,阿娇艳Z门照片无码AV4I ,国产欧美日韩另类专区,福利国产在线

　　Noise and quietness in stainless steel ventilation pipe will affect the inner lining of sound absorption pipe. The decibel of attenuation is the measurement of various shapes and sizes of lined and unlined rectangular pipes per foot of pipe length, as well as various frequencies of ventilation pipes in Shandong Province.

　　衰減與吸收系數(shù)有關(guān)，吸收系數(shù)與管道截面尺寸有關(guān)，研究發(fā)現(xiàn)，山東通風(fēng)管道的襯砌與Sivian的理論公式更接近，而不是其他明顯已經(jīng)提出的公式。該測量還通過連接到系統(tǒng)的5000cfm容量風(fēng)扇的噪聲進(jìn)行。人們發(fā)現(xiàn)噪音是由摩擦產(chǎn)生的。

　　The attenuation is related to the absorption coefficient, which is related to the pipe section size. It is found that the lining of Shandong ventilation pipe is closest to sivian's theoretical formula, rather than any other formula that has been put forward. The measurement is also carried out by noise from a 5000 CFM capacity fan connected to the system. It is found that noise is caused by friction.

　　在高達(dá)每分鐘1500英尺的速度下，無論是有內(nèi)襯還是沒有內(nèi)襯的空氣，與管道內(nèi)壁的空氣相比都是微不足道的，噪音是由風(fēng)扇葉片產(chǎn)生的。在流動(dòng)系統(tǒng)中引入了一種特殊的擋板結(jié)構(gòu)來測量靜度和空氣阻力的影響。吸收劑襯里管的摩擦阻力與未襯里管的摩擦阻力測量方法相同。

　　At speeds of up to 1500 feet per minute, air with or without lining is negligible compared to the air inside the pipe, and the noise is generated by the fan blades. A special baffle structure is introduced into the flow system to measure the influence of static and air resistance. The friction resistance of the absorber lined pipe is the same as that of the unlined pipe.

　　當(dāng)通風(fēng)道與外風(fēng)道并列時(shí)，可采用輪式換熱器。輪子的一半在一根管子里，一半在另一根管子里。

　　When the ventilation channel is parallel with the external air channel, the wheel type heat exchanger can be used. Half of the wheel is in one pipe, half in the other.

　　當(dāng)山東風(fēng)管輪轉(zhuǎn)動(dòng)時(shí)，加熱爐管中的車輪部分對穿孔車輪結(jié)構(gòu)進(jìn)行加熱。位于冷卻管中的車輪部分從穿孔的車輪結(jié)構(gòu)中去除熱量。輪子也可以用干燥劑處理，這樣水也可以從一條小溪轉(zhuǎn)移到另一條小溪。

　　When the Shandong air duct wheel rotates, the wheel part of the heating furnace pipe heats the perforated wheel structure. The part of the wheel in the cooling pipe removes heat from the perforated wheel structure. Wheels can also be treated with desiccant so that water can also be transferred from one stream to another.

　　車輪沒有完全密封，車輪本身的體積從一個(gè)管道泄漏到另一個(gè)。因此，需要在流之間零轉(zhuǎn)移(交叉污染)的應(yīng)用程序不能使用輪子。車輪需要并排和同樣大小的管道，限制了許多應(yīng)用程序所需的包裝自由度。但并非更不重要的是，輪子是帶有馬達(dá)、傳動(dòng)帶、滑輪、軸承等的主動(dòng)移動(dòng)機(jī)器，需要高技能的維修人員來保持輪子轉(zhuǎn)動(dòng)。

　　The wheels are not completely sealed and the volume of the wheels themselves leaks from one pipe to another. Therefore, applications that require zero transfer (cross contamination) between flows cannot use wheels. Wheels need to be side-by-side and the same size of pipe, limiting the freedom of packaging required by many applications. Last but not least, the wheel is an active moving machine with motor, drive belt, pulley, bearing, etc. it requires highly skilled maintenance personnel to keep the wheel rotating.