畢業(yè)設(shè)計(jì)外文翻譯----冷卻系統(tǒng)利用流體吸熱交換器-預(yù)覽頁
【正文】 ger effects the performance of a refrigeration system by in 4 fluencing both the high and loW pressure sides of a system. Figure 2 shoWs the key state points for a vapor pression cycle utilizing an idealized liquidsuction heat exchanger on a pressureenthalpy diagram. The enthalpy of the refrigerant leaving the condenser (state 3) is decreased prior to entering the expansion device (state 4) by rejecting energy to the vapor refrigerant leaving the evaporator (state 1) prior to entering the pressor (state 2). Pressure losses are not shoWn. The cooling of the condensate that occurs on the high pressure side serves to increase the refrigeration capacity and reduce the likelihood of liquid refrigerant flashing prior to reaching the expansion device. On the loW pressure side, the liquidsuction heat exchanger increases the temperature of the vapor entering the pressor and reduces the refrigerant pressure, both of Which increase the specific volume of the refr igerant and thereby decrease the mass floW rate and capacity. A major benefit of the liquidsuction heat exchanger is that it reduces the possibility of liquid carryover from the evaporator Which could harm the pressor. Liquid carryover can be readily caused by a number of factors that may include Wide fluctuations in evaporator load and poorly maintained expansion devices (especially problematic for thermostatic expansion valves used in ammonia service). 5 （翻譯） 冷卻系統(tǒng)利用流體吸熱交換器 摘錄 加熱裝置在許多冷卻系統(tǒng)中被用到，用以制冷時(shí)遺留在蒸發(fā)器中的冷卻氣體和離開冷凝器發(fā)熱流體之間的能量的熱交換 .這些流體吸收或吸收熱交換器 ,在一些情形中，他們降低了系統(tǒng)性能 , 然而系統(tǒng)的某些地方卻得到了改善 . 雖然以前研究員已經(jīng)調(diào)查了流體吸熱交換器的性能 , 但是這項(xiàng)研究可能從早先研究的三種方式被加以區(qū)別 . 首先，這份研究開辟了一個(gè)無限的嶄新的與流體吸熱交換器有關(guān)聯(lián)的群體 .其次，這份研究拓寬了早先的分析包括新型制冷劑。很明顯， ASHRAE(1998) 液體 吸加熱 交換器的確是有效的他表現(xiàn)在 : 1)增加系統(tǒng)性能 2)液體制冷劑防止散發(fā)氣體進(jìn)入擴(kuò)充裝置。 McLinden(1990) 用了相關(guān)的原則評(píng)價(jià)新的制冷劑被預(yù)期的效果 . 他指出作為理想的特殊性氣體使用在流體吸熱交換器中增加這項(xiàng)系統(tǒng)的性能 (談到制冷劑的復(fù)雜的分子結(jié)構(gòu) )。（包括流體吸熱交換器的影響）被預(yù)知的毛細(xì)管流速是早先評(píng)價(jià)的 10%，再冷卻水平的真實(shí)測量值在 之內(nèi)。圖 2 關(guān)節(jié)點(diǎn)是蒸汽壓縮周期利用理想化的流體吸熱交換器在一個(gè)壓力 焓圖表表示出來的 . 離開冷凝器的制冷劑進(jìn)入膨脹閥，離開蒸發(fā)器蒸汽制冷劑進(jìn)入壓縮機(jī)，焓減少。 7
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