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    請問高低溫試驗箱復疊式制冷在-70℃的原理和特點有哪些?


    請問高低溫試驗箱復疊式制冷在-70℃的原理和特點有哪些?

       高低溫試驗箱http://www.dghuanyi.com/products_content-569444.html在做-70℃的試驗時一般采用復疊式制冷的方式來完成,對于采用氨、R22等中溫制冷劑的壓縮式制冷系統,即使采用多級壓縮,但能夠到達的最低蒸發溫度仍有一定的局限!那么,高低溫試驗箱復疊式制冷具有什么原理和特點呢?

       1.蒸發溫度必須高于制冷劑的凝固點(比如:氨的凝固點為-77.7℃);

       2.制冷劑的蒸發溫度過低,其相應的蒸發壓力也很低。當蒸發壓力低于0.1~0.15bar 時,外界空氣易滲入系統,嚴重影響系統的正常運行(如:氨在蒸發溫度為-65℃時,pk= 0.156bar );

       3.蒸發壓力很低時,制冷劑氣態比容很大,單位容積制冷功率很小,要求壓縮機的體積流量很大。

       因此,為獲得-60~70℃的低溫,需采用低溫制冷劑(凝固點低,沸點也很低),如R13、 R14等(R13的凝固點為-181℃ ,沸點為-81.4℃ ; R14的凝固點為-184.9℃ ,沸點為-127.9℃ ) 。但這類制冷劑的臨界溫度很低,采用一般冷卻水,存在以下局限:

       -由于水溫接近其臨界溫度,使氣態制冷劑難以冷凝;

       -即使冷凝,由于接近臨界點,不但冷凝壓力高,而且比潛熱小,因而制冷效率也很低。

       為降低冷凝溫度,需采用另一臺制冷裝置為其冷凝器提供冷源,與之聯合運行,及所謂的復疊式制冷循環(高低溫試驗箱一組壓縮機采用R404A制冷劑,另一組壓縮機采用R23制冷劑為前面這組壓縮機冷凝器提供冷源)。

       高低溫試驗箱復疊式壓縮制冷系統的特點

       1.兩臺制冷機聯合運行,高溫級制冷機的蒸發器為低溫級制冷機的冷凝器提供冷源;

       2.為確保低溫級的所需冷凝溫度,高溫級制冷機的蒸發溫度需低于低溫級冷凝溫度3-5℃;

       3.復疊式制冷循環既保留了中、低溫制冷劑各自的優點,又克服了它們不足,使制取很低的溫度成為可能(深冷)。

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