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14.1.2
EXPANSION VESSEL SIZING
The following information is based on a static head of 35mtrs and a cold fill pressure of 3.5bar. If the system has different
parameters, a more detailed calculation will need to be made.
V V = S V * e
0.45
Where:
V V
=
Vessel Volume
S V
=
System Volume
e
=
Coefficient of Expansion
Flow Temp.
Flow Temp.
14.1.3
COEFFICIENT OF EXPANSION OF WATER AT 3.8 BAR COLD FILL PRESSURE
14.2
CIRCULATING PUMPS
A suitable primary pump, sized in accordance with 14.2.1 should be fitted to the inlet to the boiler.
Primary pumps are available from Lochinvar Limited as ancillary items.
ΔT (°C):
13.89
Model
l/sec
Metre-H
HCB46CE
0.69
3.90
HCB61CE
0.98
5.79
HCB86CE
1.32
3.51
*Boiler primary system piping based on 6 meters of piping, 4 - 90° elbows, and 2 - fully ported ball valves.
14.2.1
SYSTEM TEMPERATURE RISE CHART (*I
Model
HCB46CE
HCB61CE
HCB86CE
14.2.2
PRIMARY SHUNT PUMP FOR USE WITH HERALD BOILER RANGE
(See 14.1.3)
30
35
C
e
0.005
0.006
0.008
65
70
C
e
0.020
0.023
0.026
16.67
0
l/sec
Metre-H
0
2
2
0.58
3.35
0.81
3.96
1.10
2.77
P
NCLUDES
40
45
50
55
0.010
0.012
0.015
75
80
82
85
0.030
0.031
0.033
19.44
l/sec
Metre-H
0
l/sec
2
0.50
2.90
0.44
0.69
2.77
0.61
0.95
2.23
0.83
P
)
RIMARY
IPING
Primary shunt pump
LM900139A
LM900139A
LM900139A
60
0.017
90
0.037
22.22
25.00
Metre-H
0
l/sec
Metre-H
2
2.59
0.38
2.16
2.44
0.54
2.16
1.86
0.74
1.52
0
2
47
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