| 摘要 |
<p>An improved heating system (10) is disclosed for providing heated air to a heated space, preferably using a gaseous fuel as the energy source. The system preferably includes an air heating sub-system (12), a compact combustion chamber (30), a separate cold air supply sub-system (14) for convey cold air from the heated space to the air heating sub-system, a combustion chamber heat exchanger (68) in fluid communication with the cold air supply sub-system for transferring heat thereto, and a separate air circulating sub-system (16) for withdrawing cold circulating air from the heated space. A mixing chamber (54) is provided for mixing heated air from the air heating sub-system with the cold circulating air to provide heated air to the space. The system also preferably includes separate sub-systems for supplying pressurized combustion air (18) and pressurized gaseous fuel (20) to the air heating sub-system and for forcibly conveying exhaust gases therefrom without the need for a draft-type chimney or stack. In one preferred embodiment, a vortex-type air separator (38) separates higher temperature and lower temperature combustion air, with the higher temperature air being used for combustion and the lower temperature air being heated in an exhaust gas heat exchanger (94) before being conveyed to the heated space. A novel control sub-system (22) is also provided for controlling the system, preferably in response to both indoor and outdoor temperatures, and for minimizing the number of energy wasting on/off cycles in operating the system.</p> |
