| 摘要 |
An improved regenerative absorption refrigeration cycle having a high COP and a commercially practicable pumping system. In the basic cycle, an ammonia/water solution is boiled in an externally-heated generator (11). The boiled-off ammonia vapor is cooled (14) in a regenerator (16), condensed (28), expanded to low pressure (32), and boiled in an evaporator (34) to extract heat from fluid circulating to and from a cooling load (41). The low-pressure liquid ammonia returns (46) to the regenerator (16) and is absorbed back into the low-pressure water from the generator. The solution is then cooled in a low-pressure absorber (50), pumped (53) to a high-pressure conduit (57) which is heated by the regenerator heat before going back to the generator 11. The improved cycle uses at least one intermediate absorber stage 60 to absorb more ammonia vapor (69, 71) into the solution coming from the lower pressure absorber (50) to produce a cooled solution of higher ammonia concentration. This higher concentration can be used to precool (87) the liquid refrigerant prior to expansion (32). Liquid is injected (106) into the ammonia vapor returning (46) to the regenerator to boil and transport heat from the cold end to the hot end of the regenerator. The ammonia vapor is injected into the water in the regenerator at distributed points (101, 102, 103, 19) along the flow path of the water for better heat balance. |
