公开(公告)号：US4989781A

公开(公告)日：1991-02-05

申请号：US478128

申请日：1990-02-06

申请人： Eric C. Guyer ,  Martin K. Gollin

发明人： Eric C. Guyer ,  Martin K. Gollin

IPC分类号： F23L15/04 ,  F24H8/00

CPC分类号： F24H8/003 ,  F23L15/045 ,  F28D21/0007 ,  F28D5/02 ,  Y02B30/104 ,  Y02E20/348

摘要： A forced hot-water heating system in which sensible and latent heat remaining in flue gases after contact with a primary heat exchanger is recycled into incoming cold air by a second heat exchanger. The heater, humidified intake air is then directed to a fuel burner, and reduces the amount of fuel necessary to achieve a given amount of heat exchange at the primary heat exchanger at normal operating return-water temperatures.