摘要：一份詳細(xì)的理論分析,提出了兩級libr/h20吸收制冷系統(tǒng),是由一個(gè)蒸發(fā)器、低壓吸收器、低壓發(fā)生器、高壓吸收器、高壓發(fā)生器、冷凝器、低壓熱交換器和高壓熱交換器組成.是通過低溫?zé)嵩打?qū)動(dòng)的. 由理論分析和初步實(shí)驗(yàn)比較結(jié)論表明,發(fā)展理論分析體系可以合理準(zhǔn)確地描述一個(gè)實(shí)際系統(tǒng),并且今后的有廣闊的發(fā)展前途。
關(guān)鍵字:吸收；溴化鋰--水溶液；雙級
文獻(xiàn)著作上的吸收式制冷系統(tǒng)是由低品位的能量驅(qū)動(dòng)的,例如:太陽能,工業(yè)廢熱.圖1-5說明這些系統(tǒng)按照不同的工質(zhì)一般分為兩種類型:吸收式制冷系統(tǒng),利用水和溴化鋰工質(zhì)對,氨水工質(zhì)對,水-氯化鋰工質(zhì)對;吸附系統(tǒng),使用氯化物和氨吸附劑,水-硅膠,水合物,活性炭-甲醇.但是,只有吸收式制冷系統(tǒng)利用水合溴化物作為工質(zhì)對得以成功運(yùn)作并已投入商業(yè)使用中。
單級溴化鋰吸收式制冷系統(tǒng)通常是由一個(gè)蒸發(fā)器,一個(gè)吸收器,一個(gè)發(fā)生器,一個(gè)冷凝器和一個(gè)熱交換器組成.這個(gè)系統(tǒng)的運(yùn)作中,水作為制冷劑,溴化鋰作為吸收劑,并且熱源要求至少要在攝氏86度以上,為了達(dá)到一個(gè)合理的制冷系數(shù)(COP)。然而,存在大量小于86攝氏度的低溫?zé)嵩?例如:工業(yè)廢熱,太陽能和地?zé)?如果這些低溫?zé)嵩茨鼙焕没蛟倮?它不但可以提高能源系統(tǒng)的整體效率,而且還可以減少對環(huán)境的熱污染。
雙級溴化鋰制冷系統(tǒng),以水作為制冷劑,溴化鋰作為吸附劑,然而它的運(yùn)行要求75到86攝氏度的熱源即可并且它的制冷系數(shù)(COP)在0.38以上,這樣的系統(tǒng)可以達(dá)到當(dāng)冷凝水是


Abstract: A detailed theoretical analysis is presented for a two-stage LiBr/H20 absorption refrigeration system, which consists of an evaporator, a low-pressure absorber, a low-pressure generator, a high-pressure absorber, a high-pressure generator, a condenser, a low-pressure heat exchanger and a high-pressure heat exchanger, driven by a low-temperature hot source. A comparison of results from the theoretical analysis and preliminary experiment indicates that the theoretical analysis developed can represent a real system with a reasonable accuracy, and is useful for future development.
Keywords: absorption； water-lithium ；bromide；two-stage
Literature on absorption refrigeration systems driven by a low-grade energy source such as solar energy or waste heat in industries has been presented 1-5. These systems can in general be classified into two types according to the different working fluids: absorption refrigeration systems, using water-lithium bromide (LiBr/H20), water-ammonia (H20/NH3), water-lithium chloride (LiCI/H20); and adsorption systems, using ammonia calcium chloride (CaCI2/NH3), water-silica-gel, water zealot, activated charcoal-methanol (CH3OH). However, only absorption refrigeration systems using water lithium bromide as working fluid have been operated successfully and have found commercial applications.