| 摘要 |
A recuperative furnace system for space air and domestic hot water wherein a combustion product heat exchanger and a space air heat exchanger are each operated in counterflow manner. The dew point of the combustion products are elevated before entry into the combustion product heat exchanger and the water to be heated is introduced at the top at a temperature substantially below the natural dew point of the combustion products so that the fins of the heat exchanger are maintained in a substantially continuous wet state by enhanced condensation. The water thus heated is conveyed to a space air heat exchanger in counterflow to the space air so that the space air is heated to a relatively hot temperature (e.g. about 120 DEG F.) while still cooling the water to a low enough temperature (e.g. 90 DEG F.) so that the water can be looped back to the combustion product heat exchanger and still provide continuous wet operation. Alternately, the hot water can be diverted for domestic use and/or used to heat water in a stratified hot water tank.
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