7
Hoval STU Wood Pellet Boiler
Type
150
200
250
300
350
425
500
600
800
1000
• Output Maximum
kW
170
220
270
325
376
450
501
650
800
1200
• Output Minimum
kW
51
85
95
115
117
150
150
250
320
350
Nominal Output
kW
156
200
250
300
376
425
501
600
800
1085
• Full Load (nominal Output) Efficiency nCV %
88.4
89.0
89.6
90.1
90.7
90.7
90.7
91.6
92.6
93.5
• Part Load Efficiency nCV
%
85.2
86.5
87.8
89.1
90.4
90.5
90.6
91.0
91.3
91.7
• Flue Gas Temperature Nominal Output
°C
146
152
159
165
171
170
168
159
150
140
• Flue Gas Temperature Min. Output
°C
97
98
99
99
100
90
80
80
80
80
• Full Load Carbon Dioxide
%
11.7
12.4
12.8
13.2
13.2
13.2
13.3
13.8
14.4
14.9
• Flue Gas Mass Flow
(1)
kg/h
380
500
620
740
890
1050
1250
1490
1980
2470
Pellets
(2)
• Diameter
mm
6 - 8
6 - 8
6 - 8
6 - 8
6 - 8
6 - 8
6 - 8
6 - 8
6 - 8
6 - 8
• Length
mm
20 - 30
20 - 30
20 - 30
20 - 30 20 - 30
20 - 30
20 - 30
20 - 30
20 - 30
20 - 30
• Consumption at nominal Output
kg/h
37
47
58
69
86
98
115
136
180
242
• Maximum Operating Temperature
°C
90
90
90
90
90
90
90
90
90
90
• Minimum Boiler Return Temperature
°C
60
60
60
60
60
60
60
60
60
60
• Operating Pressure
bar
3
3
3
3
3
3
3
3
3
3
• Test Pressure
bar
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
• Hydraulic Resistance at 82/71°C
kPa
0.56
0.93
1.45
2.09
2.07
2.65
3.68
5.28
5.87
6.11
• Water Flow Rate 82/71°C
kg/s
3.4
4.3
5.4
6.5
8.2
9.2
10.9
13.0
17.4
21.7
• Hydraulic Resistance at 80/60°C
kPa
0.2
0.3
0.4
0.6
0.6
0.8
1.1
1.6
1.8
1.9
• Water Flow Rate 80/60°C
kg/s
1.9
2.4
3.0
3.6
4.5
5.1
6.0
7.2
9.6
11.9
• Boiler water content
litres
605
824
795
795
1110
1070
1473
1458
2592
2731
• Flue Connection ID
(3)
mm
200
200
250
250
250 - 300
300
300
350
350 - 400 350 - 400
• Min Bouyancy Required at outlet
Pa
10 - 30
10 - 30
10 - 30
10 - 30
10 - 30
10 - 30
10 - 30
10 - 30
10 - 30
10 -30
(under pressure or draught)
• Electrical Supply
(4)
ph/v/Hz 3/400/50 3/400/50 3/400/50 3/400/50 3/400/50 3/400/50 3/400/50 3/400/50 3/400/50
3/400/50
• Dry Weight (approx)
kg
1860
3050
3150
3150
3231
3480
3966
4060
6994
7384
Indicitive Emissions at Full Load
• CO Corrected 10% O
2
mg/m
3
354
275
195
116
36
69
102
72
43
13
• Particulate Corrected 10% O
2
mg/m
3
81
67
52
38
23
87
150
105
25
15
• NOx
mg/MJ
64
68
72
76
80
78
75
82
90
97
(1) Under Typical Combustion Conditions Full Load.
(2) Assumed Moisture Content 10%, CV 4.83 nkWh/Kg.
(3) Suggested Flue Diameter - ID fan has Rectangular section - actual can depend on flue route. Figures indicated deliver efflux velocities 5 - 7 m/s at full load.
(4) 32 Amp 400V 3 Phase Supply to Stoker Control Panel.
Technical Data
STU Wood-Pellet Boiler
Note:
An adequate Pump overrun period is required to dissipate heat within a STU boiler following each operating period. This should
be determined at the time of commissioning.
