This invention relates to a highly efficient refrigeration system and process, driven by low-grade heat and operated at pressures substantially below atmospheric, which provides cooling at temperatures generally within the range from about -12°C to about + 15 °C. Solutions of normally liquid, mutually soluble compounds, having substantially different boiling points, are employed as refrigerant and absorbent. Typically, the absorbent comprises a distillation bottoms fraction containing from about 65 to about 95 mol.% of the higher-boiling compound and the refrigerant comprises a distillation overhead fraction containing from about 93 to about 99 mol. % of the lower-boiling compound. Multi-effect modes may be employed. This invention also relates to the use of the aforesaid novel refrigeration system is a modified refrigeration system and process, employing two absorption refrigeration cycles in series operation, the first cycle comprising an ammonia-aqeous ammonia system and the second cycle comprising the aforesaid novel absorption system and process. Heat pumped up in the first ammonia cycle is absorbed in the second cycle by refrigerant at the coolant temperature achieved therein.
本发明涉及一种高效制冷系统和工艺,由低品位热量驱动,在压力大大低于大气压的条件下运行,制冷温度一般在-12℃至+15℃之间。制冷剂和吸收剂采用沸点基本不同的通常为液态的互溶化合物溶液。通常情况下,吸收剂由含有约 65 至约 95 摩尔%高沸点化合物的蒸馏底馏份组成,制冷剂由含有约 93 至约 99 摩尔%低沸点化合物的蒸馏顶馏份组成。可采用多效模式。本发明还涉及使用上述新型制冷系统的改良制冷系统和工艺,采用两个串联运行的吸收制冷循环,第一循环包括
氨-气
氨系统,第二循环包括上述新型吸收系统和工艺。在第一个
氨循环中被抽上来的热量在第二个循环中被达到冷却剂温度的制冷剂吸收。