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XI. Water Piping (continued)
D. Temperature Rise and Heat Exchanger Head Loss
1. The AMP heat exchanger adds pressure drop to the system which must be accounted for in the design of the
piping configuration and pump selection.
2. For systems with glycol mixture, the flow rate specified in Table 20 will increase as specified in Table 24 due
to the extra frictional loss introduced by the glycol. Size pump accordingly.
3. Strictly follow glycol manufacturer's guidelines and recommendations when adding glycol in the heating system.
4. The system should be designed to maintain the recommended water flow rate shown in Table 20 while never
exceeding the range of absolute flow rates shown in Table 23. Exceeding the maximum water flow rates can
cause pipe erosion, damage the flow switch, and allow unsafe operation.
a. Maintaining sufficient flow through the boiler will help prevent the buildup of scale.
Table 20: Temperature rise, flow rate, and head loss
Recommended Range
Delta 20 °F
Delta 25 °F
AMP
Head
Boiler
GPM
Loss
GPM
Model
(ft)
1000
97
11.1
78
1250
121
15.8
97
1500
146
15.3
116
2000
194
19.7
155
2500
242
15.4
194
3000
291
20
232
3500
339
14.4
271
4000
388
18.1
310
Required Flow = Output×1000/(500×ΔT), where flow rate is in GPM, output is in MBH, and ΔT is in 0F, Outputs are
shown in Table 1.
This Boiler has a temperature rise limit of 55 °F
20
16.7
13.35
10
6.7
3.35
0
Delta 30 °F
Delta 35 °F
Head
Head
Loss
GPM
Loss
GPM
(ft)
(ft)
7.8
65
5.9
55
11.1
81
8.3
69
10.8
97
8.1
83
13.9
129
10.5
111
11.3
161
8.9
138
14.6
194
11.3
166
10.0
226
7.6
194
12.4
258
9.3
221
50
100
150
Water Flow Rate (gal/min)
Figure 15: Heat exchanger water pressure loss
Delta 40 °F
Delta 45 °F
Head
Head
Loss
GPM
Loss
GPM
(ft)
(ft)
4.6
49
3.7
43
6.5
61
5.3
54
6.3
73
5.1
65
8.2
97
6.7
86
7.2
121
6.1
107
9.2
145
7.7
129
6.1
170
5.2
150
7.4
194
6.1
172
1250 MBtu/h
1500 MBtu/h
2000 MBtu/h
3000 MBtu/h
4000 MBtu/h
200
250
300
40
Delta 50 °F
Delta 55 °F
Head
Head
Loss
GPM
Loss
GPM
(ft)
(ft)
3.1
40
2.6
35
4.4
50
3.7
44
4.2
60
3.6
53
5.6
80
4.7
71
5.2
97
4.6
88
6.6
116
5.8
105
4.5
135
4.0
123
5.3
155
4.7
141
350
400
Head
Loss
(ft)
2.3
3.2
3.1
4.1
4.0
5.1
3.7
4.2
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