Technical data

GUH RANGE PROPANE GAS FIRED UNIT HEATERS
Page 36 of 41
7.0 Technical Data
Formulae for calculating efficiency are detailed as follows
q1 is the heat of the dry products of combustion (% of heat released per unit volume of gas)
q2 is the heat of the water vapour contained in the products of combustion (% of heat released per unit
volume of gas)
C
1
is the mean specific heat of the dry products of combustion (in MJ / (m
3
K)
t1 is the average combustion air temperature (in
o
C)
t2 is the average temperature of the products (in
o
C)
H
i
is the net calorific valueof the gas at 1013 mbar and 15
o
C, dry (in MJ / m
3
)
H
s
is the gross calorific value of the gas at 1013 mbar and 15
o
C, dry (in MJ / m
3
)
Vf
is the volume of dry products of combustion per unit volume of gas (in m
3
)
Vf is calculated from the volume of CO
2
(
V
CO
2
) produced by the combustion of 1m
3
of gas (see table
below), and
from the CO content of the products of combustion (
V
CO
2
M)
VCO
2
Vf = ---------------- x 100
V CO
2
M
Ref Gas G110 G120 G20 G25 G30 G31
V CO
2
0.26 0.32 1 0.86 4 3
The net efficiency , E (net) (in % ) is given by : E (net) = 100 + (q1 = q2)
Where t
2
– t
1
H
s
- H
i
q1 = C1 x Vf ------------------ x 100 q2 = 0.077 ------------------- (t
2
– t
1
)
H
i
H
i
7.1 Technical Data Common Information
Gas supply Types
I
3P
Destinations BE FR GB IE NL
Appliance Type B
11
PIN / report no 63AQ0533 / 160009
Electrical Supply 230V 50Hz 1ph
Fuse Rating 6 / 10 AMP
IP Rating IP44
Fan Limit Settings Fan On 60ºC Fan Off 30ºC Limit 100ºC