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US4294223A Bi-loop heat recovery system for an oil fired furnace 失效
燃油炉双回路热回收系统

Bi-loop heat recovery system for an oil fired furnace
摘要:
A heating system for dwellings or other enclosures includes a furnace in which a burner is isolated from a hot air or water system, and receives substantially all of its combustion air from outside the enclosure and preheated. A heat exchanger is provided between exhaust gases from the burner of the furnace and the combustion air.
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