Instruction manual for installation and operation of automatic pellet burner “ERATO GP20+”
(Version :
02.02.2010 10:36
)
p.
30/50
mass on the period of time, during which the fuel is transported and
accumulated).
Here is a sample for application of such an approach:
o
Determine the fuel flow rate
( for an hour or less, for example a
shorter period of time – 15 minutes=1/4 hour)- m
fuel
=7.68 kg/h.
Calculate the instant fuel flow rate (m’
fuel
), (divide fuel flow rate per
hour on 3600 , where 1 hour = 3600 seconds) and achieve m’
fuel
=
0.002133 kg/s;
o
Determine/consider the gross calorific value of the fuel
– for example
wood pellets have calorific value H
pellets
= 17.2 MJ/kg = 17200 kJ/kg.
In case other dimension of the calorific value is more convenient to
apply, for example – kWh/kg, then the calculation is as follows :
common wood pellets have gross calorific value of 4.77 kWh/kg
(which is equal to 17.2 MJ/kg);
o
Determine/consider the net efficiency of the system: pellet burner-
heat consumer unit
at nominal thermal capacity mode –
η
system
=89%=0.89. If the net efficiency is not know a priory, a good
initial guess is
η
system
=85%=0.85.
o
Calculate the thermal capacity of the heat consumer unit
-
6
.
32
002133
.
0
*
17200
*
89
.
0
'
*
*
_
=
=
=
fuel
fuel
system
consumer
heat
m
H
P
η
kW if the
calorific value of the fuel is applied in dimension – MJ/kg. In case that
the calorific value of the fuel is applied in other dimension, for
example kWh/kg, then the calculation is as follows
6
.
32
68
.
7
*
77
.
4
*
89
.
0
*
*
_
=
=
=
fuel
fuel
system
consumer
heat
m
H
P
η
kW;
o
The same algorithm should be followed for calculating thermal
capacity of the heat consumer in case that the fuel calorific value
differs that cited above or the required thermal capacity of the unit is
lower that the nominal one;
The producer reserves the right to change the factory defined values of
operating parameters of the burner without prior notice;
5.2.6.
Adjustment process of the burner, according to the heat
demand of a consumer
It is recommended to make appropriate adjustments of operating
parameters of the burner in order to obtain high efficiency and reliable
performance of the unit,
considering the thermal load. This is achieved by
appropriate adjustment of the position of the thermal capacity potentiometer.
