Building automation – impact on energy efficiency - Siemens ...

AUTOMATIC CONTROL
1 HEATING CONTROL BT Reason for energy savings
1.6 Generator control for combustion and district heating
The goal consists generally in minimizing the generator operation
temperature
0 Constant temperature control The generator continuously provides the highest design
temperature of all consumers, resulting in significant
energy losses under part load conditions.
1 Variable temperature control depending on outdoor temperature
2 Variable temperature control depending on the load:
E.g. depending on supply water temperature
1.7 Generator control for heat pumps
The goal consists generally in minimizing the generator operation
temperature
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Generation temperature is controlled depending on the
outside temperature (corresponding to the probable
temperature demand of the consumers), considerably
reducing energy losses.
Generation temperature is controlled depending on the
effective heat demand of the consumers, keeping energy
losses at the generator to an optimum (low).
0 Constant temperature control Generation temperature is controlled depending on the
outside temperature (corresponding to the probable
temperature demand of the consumers), thus increasing
the COP.
1 Variable temperature control depending on outdoor temperature
2 Variable temperature control depending on the load:
E.g. depending on supply water temperature
Generation temperature is controlled depending on the
effective temperature demand of the consumers, keeping
the COP at an optimum (high).
Priority control adapts current generation output (with
priority to renewable forms of energy) to current load in an
energy-efficient manner.
1.8 Sequencing of different generators Priority control adapts current generation output (with
priority to renewable forms of energy) to current load in an
energy efficient manner.
0 Priorities only based on running time
1 Priorities only based on loads 10 Only the generators for covering the current load are in
operation.
2 Priorities based on loads and demand of the generator capacities
3 Priorities based on generator efficiency
The generator operational control is set individually to
available generators so that they operate with an overall
high degree of efficiency (e.g. solar, geothermic heat, cogeneration
plant, fossil fuels)
At increasing output stages of all generators (e.g. 1 : 2 : 4,
etc.)
a) adaptation of the current generator output to load can
be more precise,
b) the large generators operate in a more efficient
partial load range
The generator operational control is set individually to
available generators so that they operate with an overall
high degree of efficiency or using the cheapest energy
form (e.g. solar, geothermic heat, cogeneration plant,
fossil fuels).
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