In response to JudyJPG's post from November 04 2009 01:43PM
JudyJPG said…
This is interesting to know, and I hope someone can explain way, since dryers use a large proportion of costs on an electric bill.
Great question to ask.
"ENERGY STAR is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices."
Officially, ENERGY STAR does not label clothes dryers because "there is little difference in energy use among models."
Here are some ways to reduce energy consumption when using your clothes dryer: If you have it, use the moisture sensor "auto dry" function instead of timed dry; clean out the lint trap every time you use the dryer; scrub the lint trap filter if you use dryer sheets - dryer sheets can leave a film on the filter that reduces air flow and, over time, can affect the performance of the motor. Consider using a toothbrush to scrub it clean once a month.
There is, actually, some significant total energy use differences in dryers, but, sadly, because they are not rated by ENERGY STAR, people do not see the value. One of the very best dryers is the Kenmore Elite Oasis Steam 68082. Nearly all dryers have one motor that turns the drum and additionally have a belt from that one motor that turns the blower fan; the 68082 has a second DC MOTOR that turns the blower fan. A DC fan motor is like a treadmill motor, it can be varied to any speed from full speed to off and anywhere in between. The blower motor in the 68082 will vary, blowing out only the volume of air that is actually required to quickly dry the clothes.
One way to understand it is: your car doesn't have any heat during winter until the engine is warm, it doesn't do any good to have the heater fan on full blast until the engine has warmed up.
Another way to think of it is: your clothes dryer is forcing air from inside your home to the outside - all of that air is replaced with unheated or non-airconditioned air from outside. It makes sense to limit that air to the minimum, efficient flow.
-Barry