Sealed combustion is a standard feature, where the unit draws oxygen directly from the outdoors rather than from the indoor air you are heating. Consequently, the exhaust that is vented outside is much cooler than that of a conventional furnace, often appearing as a white vapor.
Understanding Phase Change Heat Transfer in High Efficiency Furnaces
In contrast, a high efficiency furnace typically boasts an AFUE of 90% or higher, meaning that for every dollar spent on fuel, 90 cents or more is converted into usable warmth for your home. Unlike older models that allowed heated air to escape up the flue, these modern systems capture and reuse heat that would otherwise be lost.
By capturing dust and allergens through advanced filtration, these units provide a health benefit that extends beyond simple temperature regulation. High efficiency furnaces represent a significant evolution in home heating technology, designed to minimize energy waste while maximizing comfort.
Understanding Phase Change in Heat Transfer for High Efficiency Furnaces
The Condensation Process The transition to a secondary heat exchanger necessitates a change in the physical state of the exhaust byproduct. For example, a furnace with an 80% AFUE rating loses 20% of its energy through exhaust or other losses.
More About How do high efficiency furnaces work
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