Photo credit: USDOE
|
Remember that Freon can and does pick up
heat all the way down to 360 degrees
below zero.
The hotter the weather, the more heat
that Freon picks
up from the air and the closer the temperature gets to
360 degrees below zero, the less heat that it
picks up.
Freon can still pick up some
heat at 359 degrees below zero.
Remembering this can help in understanding why
we
can save money with Alternative Energy.
The heat pumps being used today run on 220
volts, but
if we use wind and solar power to run the
compressor,
fan and relay the electric company will
only need to
be used as a backup system.
Heat pumps can be extremely efficient in their use of
energy.
But one problem with most heat pumps in colder weather
is that the
coils on the outside air unit collect ice.
The heat pump has to melt this ice periodically, so it
switches itself back
to an air conditioner, then,
an electric coil heater comes on to heat up the coils.
To avoid pumping cold air into the house in air conditioner mode,
the heat
pump can light up burners or electric strip heaters
to heat the cold air
that the air conditioner is pumping out.
Once the ice is melted, the heat pump switches back
to heating mode and
turns off the burners.
Geothermal Heat Pumps
A Geothermal Heat pump
works just like the ones that have
been around for years, except because
the ground water
is around 55 degrees, not the outside temperature,
the compressor runs for a shorter
period of time
and therefore costs less to operate.
The heat exchanging tubes are in the ground, instead
of in the air.
In a geothermal system, water-filled tubes buried in the
ground
pick up the ground’s heat
about 50° to 55° year round
and circulate that water
to the heat pump.
You have to use a compressible gas system, or Air
conditioner,
when you compress the Freon from a large volume
to a small
volume, you also compress
the larger volume’s heat, so by definition,
there’s a lot more heat per
unit
in the smaller volume,
the surface of what’s holding the compressed gas gets
hot too.
Photo credit: USDOE
|
Now, if you blow air across that hot surface, you can
heat your house.
When you blow air across the hot surface, you take the
heat out
of the compressed gas, cooling it
and the gas turns
into a
liquid.
In order to turn it back into a gas,
you have to warm it up
take the pressure off and give it a place to expand
into.
At this point in the cycle, the fluid is now just about
freezing
temperature (32°), so the 50° water
from the ground has plenty of heat to warm
it up, unlike the outside air in
colder weather.
Photo credit: USDOE |
When you want to cool your house, the system runs
in reverse,
heat from the house expands the liquid into a gas and
the
warmed water in the ground loops stores its heat
in
the earth from warm water temperature,
to the 50 to 55 ground
temperature.
Ground source or Geothermal heat pumps have
several
advantages over fuel burning furnaces.
They’re environmentally friendly and efficient.
Since the energy to heat your house
comes from the sun
and the earth’s core, all you pay for is the
electricity
to run the compressor, the blower and the water pump.
It’s
common to get 3 to 5 times the energy
out of a heat pump than what you put into it.
Geothermal systems help heat your hot water.
Compressors are not 100% efficient and produce a little
“waste” heat, called
“superheat”, since the compressor’s
job in the heat pump is to make gas
hot.
Today’s Geothermal systems have a water-filled jacket,
called a
“desuperheater” which takes that extra heat
and pumps it into your water
heater.
Every time the compressor runs
to either heat or
cool your house you’re getting “free” hot water.
Geothermal systems are versatile and quiet and
its
really easy to have forced-air heating and cooling,
or radiant in-floor
heat, in your basement or garage.
Places to learn more:
Department of Energy
Heat Pumps
Geothermal Education
Geothermal Heat Pumps
Geothermal
Technologies Program
Geothermal Heat Pump
Geothermal Heat Pumps
Heat Pumps, How Well Do They Work?
How
Air-Source Heat Pumps Work
How the
Heat Pump Operates
For further
information about any
of these and
other energy saving ideas,
please
contact me.
You
may contact Sachem Walkingfox at:
sachemuncas at centurylink.net
My other web sites are at:
Sachem Speaks Wordpress
My Smudging Blog Spot
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Last edited November 12, 2022
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