Abstract
Heat transfer devices are provided in many refrigeration systems to exchange energy betWeen the cool gaseous refrigerant leaving the evaporator and Warm liquid refrigerant exiting the condenser. These liquid-suction or suction-line heat exchangers can, in some cases, yield improved system performance While in other cases they degrade system performance. Although previous researchers have investigated performance of liquid-suction heat exchangers, this study can be distinguished from the previous studies in three Ways. First, this paper identifies a neW dimensionless group to correlate performance impacts attributable to liquid-suction heat exchangers. Second, the paper extends previous analyses to include neW refrigerants. Third, the analysis includes the impact of pressure drops through the liquid-suction heat exchanger on system performance. It is shoWn that reliance on simplified analysis techniques can lead to inaccurate conclusions regarding the impact of liquid-suction heat exchangers on refrigeration system performance. From detailed analyses, it can be concluded that liquid-suction heat exchangers that have a minimal pressure loss on the loW pressure side are useful for systems using R507A, R134a, R12, R404A, R290, R407C, R600, and R410A. The liquid-suction heat exchanger is detrimental to system performance in systems using R22, R32, and R717.
摘錄
加熱裝置在許多冷卻系統(tǒng)中被用到，用以制冷時遺留在蒸發(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調查了流體吸熱交換器的性能, 但是這項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無限的嶄新的與流體吸熱交換器有關聯(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。第三, 研究包括壓力的沖擊降低了流體吸熱交換器的系統(tǒng)性能. 在簡單的技術信息分析中表明流體吸熱交換器對冷卻系統(tǒng)性能的沖擊可能導致錯誤的結論.從詳細說明分析里,它能得出一個結論，那就是液體- 吸加熱交換器在低壓區(qū)域上的臨界壓力使用 R507A ， R134a ， R12 ， R404A ， R290 ，R407C ， R600 和 R410A這些制冷劑，對系統(tǒng)是有用的。而使用 R22 ， R32 和 R717對系統(tǒng)的性能是有害的.