Metal buildings and heat exchangers

Heat exchangers should increase the heating performance by five to 10 percent, according to the U.S. Department of Energy. However, exchangers must be added to the unit during its initial installment.

The system uses a fan to heat the air by pushing it through hot tubes. The tubes allow the air to continue circulation instead of relying on natural convection. Heat exchangers also require frequent cleaning. Soot accumulating in the tubes affects the system's performance.

The ventilation rate of a traditionally leaky, drafty home is determined by the weather; the outdoor temperature dives stack effect in the home, and the wind just plain blows right through! The colder and windier it gets, the better ventilated your house is. When you build a tight home with a high-quality ventilation system, you control the ventilation rate. Complaints you may have heard about stuffiness and moisture problems in tight houses come from houses where the builder did not install a ventilation system commensurate with the quality of the house, or the system is not being controlled properly. HRVs can be retrofit in most existing homes, but a blower door test (check with your electric utility or heating contractor) should be performed first. HRVs are generally only used in homes which require mechanical ventilation, usually homes with a natural ventilation rate of less than .35 ACH.

 

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