STIEBEL ELTRON Heat pumps, Technical Manual

Page: 14 / 260

14 www.stiebel-eltron.CoM
EnErgy SavIngS ordEr EnEv [gErmany]
outline Din V 18599
Part 1
General statement procedure, terminology,
zoning and assessing fuel types
Part 2 Demand for useable energy for heating and cooling building zones
Part 3 Demand of useable energy for air treatment with energy
Part 4 Useable energy and net energy demand for lighting
Part 5 net energy demand of heating systems
Part 6 net energy demand of domestic ventilation systems
and air heating systems for residential buildings
Part 7 net energy demand for air handling and air conditioning systems
for non-residential buildings
Part 8 Useable energy and net energy demand for DHw heating systems
Part 9 net and primary energy demand of CHP systems
Part 10 Utilisation framework conditions, climate data
supplement 1 examples
system description - reference system technology
Central
low temperature boilers
heating Pressure-jet boilers
natural gas
installation outside the thermal envelope
system temperature 55/45 °C
Hydraulically balanced
twin-pipe heating system
Distribution lines - unheated area
riser and connection lines, internal
Dp constant
Pump sized in accordance with demand
wwb Common heat generation with the heating system
(central) indirectly heated cylinder
installation outside the thermal envelope
with DHw circulation
Dp constant
Pump sized in accordance with demand
Compensation options
the better the equipment performs,
the lower the requirement for thermal
insulation of the building envelope.
the eneV opens up interesting
compensation options. the optimum
use of primary energy is ensured
by systems such as heat pumps or
domestic ventilation systems with heat
recovery.
System technology
it is generally recommended to
calculate the heat source expenditure
of energy value in accordance
with the detailed procedure in Din
4701-10 applying manufacturer's
details. subject to heat source,
performance factors are applied at
different operating conditions that
can sometimes vary significantly from
standard values. this also applies to
the expenditure as a result of losses
and auxiliary energy, for example
caused by components such as
cylinders and auxiliary drives. stiebel
eltron offers you a calculation
service or the calculation basics and
software free of charge on CD roM.
EnEV for non-residential buildings
As part of the eneV 2007 update,
applicable from the 1st october
2007, the eU energy Performance of
buildings Directive" for the statement
of non-residential buildings was
adopted in the form of the extensive
standard Din V 18599 that determines
the calculations principles.
DIN V 18599 - Energy assessment of
buildings
Contrary to the calculation for
residential buildings to Din 4108
part 6 and Din 4701 part 10, the
Din V 18599 provides a statement
not only for the energy demand for
heating, DHw heating and domestic
ventilation, but also for cooling and
lighting. it comprises 10 parts that
are linked through cross-references.
the essential difference when
considering non-residential buildings
is the assessment of the respective
utilisation profile. the primary energy
demands are no longer simply
dependent on the area and volume
covered by the building envelope,
but additionally relate to different
room temperatures, lighting, air
changes, times of utilisation, density
of occupation and the internal heating
loads. A further update of the eneV
2007 (scheduled for 1 January 2009)
envisages replacement of the currently
applicable method of calculation for
residential buildings through that
specified in the Din V 18599.
The reference building procedure
to determine the permissible annual
primary energy demand of a non-
residential building, a reference
building is determined that in
geometry, net floor area, orientation
and utilisation profile matches the
building to be assessed perfectly.
the energy quality of the building
envelope of the reference building
is specified in the eneV via default
transmission heat transfer coefficient
Ht ‘. system technology is also
specified for the reference building
covering heating, DHw heating, air
conditioning, air handling technology
and lighting. For this reference
building, in the first instance the
permissible annual primary energy
demand is determined. then the
actual value is determined applying
the actual building characteristics
and system technology. to meet the
requirements of the eneV the existing
annual primary energy demand must
be below the maximum permissible
value of the reference building. Heat
pumps are particularly suitable heat
sources for heating and DHw heating,
as they deliver a more favourable
primary energy statement than the
reference system technology. this
enables the eneV requirements
to be met quite easily, given a
corresponding quality of the building
envelope.