分析一“夏”宏展冷熱沖擊試驗箱的充注結(jié)合系統(tǒng)

? ?冷熱沖擊試驗箱 以 -70 ℃ 為設(shè)計工況:低溫室溫度恒定為 -70 ℃ ,被測元件的轉(zhuǎn)換時間不大于 5min 。蒸發(fā)器內(nèi)制冷劑在 -75 ℃ 溫度下蒸發(fā),壓縮機吸氣溫度為 10 ℃ ,可保證進入壓縮機的制冷劑懔氣態(tài)工質(zhì)。為了便于循環(huán)中工質(zhì)計算,作為以下假設(shè):?
1. 忽略管道內(nèi)的壓力損失,系統(tǒng)中只有高壓 Pk 、中壓 Pm 、低壓 Po 。?
2. 循環(huán)時熱量交抽換只在換熱器內(nèi)進行,換熱器、管道與環(huán)境無熱量交換,而且各換熱器間無相互干擾。?
3.?冷熱沖擊試驗箱混合式質(zhì)循環(huán)時,高低溫制冷劑在精餾柱內(nèi)完全分離,在循環(huán)中無有害積液。?
4. 制冷劑充注時,結(jié)合系統(tǒng)工作原理和系統(tǒng)各點狀態(tài)進行分析和比例計算,來確定高低溫工質(zhì)組分構(gòu)成。?


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