Our optimization project: "old" heating system

  1. The heating system in words and pictures
  2. An overview of 10-years successful energy-saving in figures
  3. Graphs of running the heating


The heating system until 2001

A look at the picture will show you that the boiler isn't exactly state-of-the-art (1985 model, we changed it in March, 2001). Since optimization began, no changes have been made to the house, and the inside temperatur was always 20ºC. It should be remembered that the boiler has to warm the hot water too.

View of system: burner and distribution
View of system: burner and distribution
  • Measured against a 10-year average, we still managed to achieve
    • a reduction of 27.3% in oil consumption!
  • Since we started to look after things, one side-effect was the reduction in the switch on/off frequency
    • from 13627 times "ON" per year
    • to only 3420 times, which is 76% less or only one-quarter of what it was before! (A "normal" burner switches about 20'000 - 30'000 times a year.)
  • Changes of this kind naturally save oil and reduce CO2, soot and pollution. The many other strategies we used in achieving this are our secret.

 

Data of the old system from 1985 - 2001

  • Multi-purpose system with water heating via a KL-MT 3.1
  • (Elco-) Klöckner cast-iron boiler, nominal heating power output 15kW
  • Oil burner KL 20.1
  • optimized burner output now with Werner nozzle 0.3 = 11kW.
  • Distribution: Mixing valve downstream of underfloor heating.
Werner-nozzle
 

Special control and adjustment features

The combination of two sensors in the heating circuit forming one mean value (at the very top of the picture) is a tailor-made unit from Klöckner 1988 (thanks to Herr Pieck, because Klöckner had nothing like that in the standard range) this came out of an idea I got from Velta.
 
This mode of adjustment was the precursor of the Veltamat adjuster shown above, and has similar properties to the Klöckner adjuster used.
Ideal Graph of temperatures
Ideal Graph of temperatures [Source: Velta]

Wear or rust?

Reducing the enormously high waste gas temperature (approx. 200░C or higher) was achieved using special metal inserts. No trace of corrosion could be found 14 years later, even though the system was always started near the dew point.

 

An overview of 10-years successful energy-saving in figures

Year Outside temp.
Mean{░C}
No. degree days
15/20{d*K}
Burner
on/off
Burn
time{h}
Oil used
{L/m▓}      #10
What we did
1990 11.4 3147 measurable measurable 10.98 12.14 15/9: Switch-on & running time counters built in
1991 10.5 3540 13627 1781 12.78 12.16 -
1992 10.9 3291 10055 1473 12.15 12.42 -
1993 10.4 3509 12011 2089 11.31 11.85 -
1994 11.3 3188 11070 1493 9.76 10.30 04/94 Data gathering unit built in
1995 11.3 3811 6289 1677 10.32 10.38 Min. running time &
lower limit temp. changed
1996 9.3 3948 3626 1918 11.72 9.99 Jan.: Atomizer of 0.3/60º etc..
1997 11.1 3295 3274 1487.8 8.57 8.75 Heating pump control & warm water vacation switch installed
1998 11.0 3290 3749 1554.6 8.73 8.95 Test: boiler cleaned, when waste gas >220ºC
1999 11.6 3209.4 3234 1429 8.19 8.59 (Jan.: This table created :-) long time off in summer
2000 11.6 3049 2879 1340.4 7.97 8.80 reducing the burners on/off
10 years' total mean
1991-00 10.90 3366 6986.8 1624.34 10.20 10.30 18.54% annual running time of burner
Savings in 2000, baseline 1991-1993 75.8%   27.3% 170.-euro oil +
  33.-euro tax

Key to the 10-years overview:
*
Temperatures
& statistics
These data have been logged by us since installing the data logger. The years before we relied on external data recording.
Click on an annual mean temperature to see a graph showing the statistical break-down of temperatures over the year in a new window.
#10
Oil consumption
The left-hand value is the consumption-to-surface ratio,
the right-hand value is the calculated mean requirement, standardized to a number of degree days over a 10-year period.
The 25-year mean of number of degree days (1973-1998) is 3498.
~
Current status
All figures are for one year, the current status is the 1.3.2001


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page written 01.1.1999, last change 17:34 10.1.2003, Freitag