22 Jan '14, 11am

Building Science: Will a Gas Furnace Dry Out a Home’s Air?

Think about that a second. The air in your house has a certain amount of moisture in it. That air, with its moisture, gets pulled into the return duct, goes across the furnace’s heat exchanger Device that transfers heat from one material or medium to another. An air-to-air heat exchanger, or heat-recovery ventilator, transfers heat from one airstream to another. A copper-pipe heat exchanger in a solar water-heater tank transfers heat from the heat-transfer fluid circulating through a solar collector to the potable water in the storage tank. , and then put back into the house. If there’s no duct leakage and no humidifier or dehumidifier in the system, the amount of moisture that goes in is the same amount that comes out. The air gets heated so the relative humidity drops, but the air isn’t any drier in terms of absolute humidity.

Full article: http://www.greenbuildingadvisor.com/blogs/dept/building-s...

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