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HEatIng load calcUlatIon
Heating load
Firstly determine the required heating
load of the building. observe the
calculation to Din en 12831 for
reliable quotations and design.
the heating load can also be
estimated for dual-mode heat pump
systems with an existing heat source.
1. Subject to the heated living space
see adjacent table for the heating
load per m² living space.
Q
n
= living space
x
watt/m²
2. Subject to oil consumption
the annual consumption can be
determined from the average oil
consumption over the last five years.
Q
n
= b
a
x
h
x
H
u
/ b
VH
Q
n
= Heating load (kw)
b
a
= Annual oil consumption (l)
h
= seasonal efficiency [to Din] (
h
= 0.7)
H
u
= Calorific value of fuel oil
(10 kwh/l)
b
VH
= Hours run at full utilisation
(average value 1800 h/p.a.)
brief formula
Q
n
= b
a
/ 250
3. Subject to gas consumption
the annual consumption can be
determined from the average gas
consumption over the last five years.
Q
n
= b
a
x
h
/ b
VH
Q
n
= Heating load (kw)
b
a
= Annual gas consumption (kwh)
h
= seasonal efficiency [to Din] (
h
= 0.8)
b
VH
= Hours run at full utilisation
(average value 1800 h/p.a.)
Detached or two-family home
thermal insulation of
the external wall
window
Floors
w per m²
living space
no
single glazed
1
160
no
single glazed
2
140
no
double glazed
1 to 2
100
yes
double glazed
1 to 2
80
yes
low-e glass
1 to 2
50
Summary of Contents for Heat pumps
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Page 183: ...183 www stiebel eltron COM Accessories for heating heat pumps ...