Solar Panel construction
Stamp Module for the controller
reads 6 Thermal resistors for 6 temperatures
three AC 110 volts solid state contacts
five 1 amp. relays
106 sq. ft. or 10 sq. meters
6.7 ft high
16 ft long
by Thermafin www.solarenergy.com/
two pumps Taco 008 Glycol and
Taco 006 water
both at 6 gal/m
20 Ft. Heat exchanger 1/2" copper inside 1" copper pipe
one expansion tank
four 55 gal. drums for water storage
three 5 ft baseboard heaters
600 BTU / 32800 Max. = 18% in 2001
makes for not to good system . 8-(
System Efficiency 972 BTU / 32800 Max. 29% in
Makes for a better system. I reworked the solar panel. 8-)
Average Day at OHIO in DEC. with partly sun! My panels collect apx..
27 thousand BTU. It takes 220 gal of water
and warms it up by 15 deg.F. On a Max. sunny day I get apx.. 40 Thousand BTU. a increase of 22 deg.F.
I have changed my system so that I can use one 55 gal drum or four
55 gal drums to store the heat.
In NOV. to March I'll use only one 55 gal drum to store.
With the above figures. Only one drum it will raise the water temperature to around 130 deg.F. That will let the
Baseboard heaters work more efficient..
On Jan 12 2002 it was a sunny day in Ohio the 55 gal. drum got up to 132 deg. F. with outside temperature at a hi of 38 F.
That makes is 29,800 BTU of heat that's apx.. ( 600 BTU per sq. Meter ) of panel per hour.
In September of 2002 I reworked the solar panel . I added more Insulation and improved the air seal on the glass.
Well I got these
readings off the Heat exchanger.
first reading 1 1/2 hours of sun.
second readings 2 1/2 hours of sun.
third readings 3 1/2 hours of sun. that was at 12 noon. the air temp. of the solar panel was 135 deg. F.
all reading are to reference to the heat exchanger inputs and output.
Glycol out water in water out
84 80 72 80
96 92 79 87
110 99 86 108
The sun quit at 2:00 PM the 104 113
The to fluids flow in different directions
in the heat exchanger.
I know that's the correct way . I have added an motor speed control for the water pump , That
allows me to control the flow of the water in the heat exchanger. Right now it is set a about
60% motor speed. to get the highest temperature from the Heat exchanger.
Preheating House hot water
Another point is interest is my preheating of my cold water before it enters the hot water heater.
Our average usage of water is 900 gal. About 300 gal is hot water. In Dec. I get about 25 to 50 solar heat hours.
To cal. my apx.. savings of electric for a year use.
With out any usage of the solar panel it would take 212,800 BTU (62 KW.) to heat up that water .
The average water temp. coming the city water in Dec. in Ohio is 45 deg. F.
With 5 days of about 5 hours of sun in Dec.
That makes 60 gal will make it to 130 deg. F. = 40,056 BTU = 11.73 KW of electric power.
That makes 240 gal will make it to 65 deg. F. = 42,560 BTU = 12.468 Kw of electric power.
A savings of 24 KW. $3.98 in DEC. I expect that May-Oct the savings will =$10 per month.
Apx. $100 a year savings. Just in preheating my hot water.
Diagram of Solar System .
Frame view absorber plates
absorber plates mounted in
four 55 Gal Drums for heat storage
Has two pumps hear exchanger and expansion tank
and Home made controller. Via ( Stamp Module )
Heat exchanger 1/2" pipe inside 1" pipe
Home Brewed Stamp Module controller panel
20 ft. long.
Circuit board bottom view
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