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  1. 行業動態

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    行業動態

    冷干機蒸發溫度為什么不能很低?

    來源:杭州優聯超濾設備有限公司  日期:2017-05-02 13:35:34  點擊:2485  屬于:行業動態
    冷干機在正常情況下,蒸發器表面有一層膜狀冷凝水存在。在計算蒸發器冷負荷時已經考慮到這一情況。如果蒸發溫度降得很低,使換熱銅管表面溫度在零度以下,水蒸氣就會在銅管表面凝結成霜,由此產生的問題是
    冷干機在正常情況下,蒸發器表面有一層膜狀冷凝水存在。在計算蒸發器冷負荷時已經考慮到這一情況。如果蒸發溫度降得很低,使換熱銅管表面溫度在零度以下,水蒸氣就會在銅管表面凝結成霜,由此產生的問題是:
    Under normal circumstances, there is a layer of film condensation water on the surface of the evaporator. This has been taken into account when calculating the cooling load of the evaporator. If the evaporation temperature is very low, so that the surface temperature of the copper pipe is below zero, the water vapor will condense on the surface of the copper tube into frost, the problem is:
    ①水蒸氣“升華為霜”比“凝結為露”要多吸收約15%的冷量;
    Water vapor "sublimation" as frost "condensation" to absorb more than 15% of the amount of cold;
    ②霜的熱導率只有水的1/4,使管外空氣不能充分冷卻,而同時管內蒸發溫度卻有進一步降低的趨勢,如此循環的結果,必將給制冷系統帶來許多不良后果(譬如產生“液壓縮”);
    The thermal conductivity rate of only 1/4 of water frost, the air outside the tube can not be fully cooled, while tube evaporation temperature has further decreased, so the results will bring many adverse consequences to the refrigeration system (such as "liquid compression");
    ③從空氣流通徑講,霜的存在會使空氣阻力增加,使供氣壓力降低,嚴重時甚至會使氣路堵塞;
    Speaking from the air circulation, the presence of frost will increase the air resistance, so that the supply pressure is reduced, and even serious gas road blockage;
    ④從系統能耗來講,蒸發溫度過低導致壓縮機制冷系數大幅下降,能耗增加。所以含濕量很大的壓縮空氣進入冷干機工作時,冷媒在管內的蒸發溫度至少應保證蒸發器銅管表面溫度在零度以上。試圖通過定時化霜的辦法來降低蒸發溫度,冷干機是不能接受的。
    From the energy consumption of the system, the evaporation temperature is too low, which leads to the decrease of the compressor refrigeration coefficient and the increase of energy consumption. Therefore, a large amount of compressed air into the cold dry machine, the refrigerant in the tube evaporation temperature should be at least to ensure that the surface temperature of the evaporator tube above zero. It is not acceptable to try to reduce the evaporation temperature by the method of timing defrosting.
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