通風(fēng)管道設(shè)備負(fù)壓風(fēng)機的降溫原理是什么

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　　通風(fēng)管道設(shè)備負(fù)壓風(fēng)機的降溫原理介紹

　　Introduction of cooling principle of negative pressure fan for ventilation pipeline equipment對于車間的降溫通風(fēng)工程，我們要了解負(fù)壓風(fēng)機的降溫原理，只有熟悉它才能做好車間的通風(fēng)工程。

　　For the cooling and ventilation engineering of the workshop, we should first understand the cooling principle of the negative pressure fan. Only by familiarizing with it can we do the ventilation engineering of the workshop well.

　　一、換氣降溫：由于陽光照射建筑物、機器設(shè)備、人體等熱源導(dǎo)致需要通風(fēng)的場所氣溫高于室外。負(fù)壓風(fēng)機能將室內(nèi)熱氣迅速排出，讓室溫和外界溫度持平，不于車間內(nèi)溫度升高。

　　1. Ventilation and cooling: The temperature of places requiring ventilation is higher than that of outdoors because of the sunlight illuminating buildings, machinery and equipment, human body and other heat sources. Negative pressure fan can expel the hot air quickly, keep the room temperature and the outside temperature level, so as not to increase the temperature in the workshop.

　　二、空氣流動帶走人體熱量，空氣流動加速汗液蒸發(fā)而吸收人體熱量，從而讓人體感覺涼爽，和自然風(fēng)一樣涼爽。

　　2. Air flow takes away human heat. Air flow accelerates the evaporation of sweat and absorbs human heat, thus making the human body feel cool, as cool as natural wind.

　　三、負(fù)壓風(fēng)機只有通風(fēng)降溫的作用，沒有制冷的功能，涼爽是人體的感覺。負(fù)壓風(fēng)機能降多少溫度的說法是無知的。

　　3. The negative pressure fan only has the function of ventilation and cooling, and has no refrigeration function. Coolness is the human body's feeling. It is ignorant to say how much temperature can be lowered by a negative pressure fan.

　　四、和水簾配合使用，在夏季炎熱的時候可將車間內(nèi)溫度控制在28攝氏度以內(nèi)。但人體的涼爽感覺可與空調(diào)相比，稍長時間對著水簾的人會感覺冷而受不了。

　　4. Cooperating with water curtain, the temperature in workshop can be controlled within 28 degrees Celsius at the hottest time in summer. But the human body's cool feeling can be compared with air-conditioning, a little longer in front of the water curtain will feel cold and unbearable.

　　如何測定通風(fēng)管道內(nèi)的風(fēng)速及風(fēng)量？

　　How to measure the wind speed and volume in the ventilation duct?

　　通風(fēng)管道內(nèi)風(fēng)速及風(fēng)量的測定，是通過測量壓力換算得到的。

　　The measurement of wind speed and volume in ventilation duct is obtained by measuring pressure conversion.

　　據(jù)了解，要想測得管道中氣體的真實壓力值，除了正確使用測壓儀器外，合理選擇測量斷面、減少氣流的擾動對測量結(jié)果的影響很大。

　　It is understood that in order to measure the real pressure of gas in the pipeline, besides the correct use of pressure measuring instruments, reasonable selection of measurement section and reduction of air disturbance have a great impact on the measurement results.

　　測量斷面應(yīng)盡量選擇在氣流平穩(wěn)的直管段上。測定動壓時如發(fā)現(xiàn)任何一個測點出現(xiàn)零值或負(fù)值，表明氣流不穩(wěn)定，該斷面不宜作為測定斷面。

　　The measurement section should be chosen as far as possible in the straight pipe section with smooth air flow. If zero or negative values are found at any measuring point during the dynamic pressure measurement, which indicates that the air flow is unstable, the section should not be used as the measuring section.

　　當(dāng)測量斷面設(shè)在彎頭、三通等異形部件前面(相對氣流流動方向)時，距這些部件的距離應(yīng)大于2倍管道直徑。

　　When the measuring section is located in front of the elbow, tee and other special-shaped parts (relative flow direction), the distance from these parts should be greater than 2 times the diameter of the pipeline.

　　當(dāng)測量斷面設(shè)在彎頭、三通等異形部件后面時，距這些部件的距離應(yīng)大于4～5倍管道直徑。

　　When the measuring section is behind the elbow and tee, the distance from these parts should be greater than 4-5 times the diameter of the pipeline.

　　當(dāng)測試現(xiàn)場難于滿足要求時，為減少誤差可適當(dāng)增加測點。但是，測量斷面位置距異形部件的小距離少是管道直徑的1.5倍。

　　When the test site is difficult to meet the requirements, in order to reduce the error, the measurement points can be increased appropriately. However, the minimum distance between the measured section position and the special-shaped parts is at least 1.5 times the diameter of the pipeline.