Buderus 21 - Design Procedure for Two-Pipe System

Applications manual
| 27
Panel Radiator
Design Manual
Panel Radiator Design Manual | 12.2009 Technical specications are subject to change without prior notice
Design Procedure for Two-Pipe System
1. Determine individual heat loads.
2. Select desired overall temperature drop of systems
(∆T); i.e. 20°F (11°C), 30°F (17°C) or 40°F (22°C).
3. Compute loop ow rate GPM from:
GPM = Q / 500 / ∆T
4. Use Figure 10 or the Conversion Factors in Table 9 to
determine output of radiator models in case of lower
supply temperatures.
5. Use the Pressure Drop Chart on pages 30-31 as a
guide to set the ow setter valve for each radiator to
ensure proper ow through each radiator. Adjust ow
setter valves as needed based on system
performance. Close down the ow setter on “hot”
radiators by dialing in a lower setting on the adjustment
ring, or adjust the ow setter to a higher setting for
“cool” radiators.
6. Size piping based on system ow rate; size circulator
based on ow rate and overall system pressure drop.
Table 14
1 Select
room
sequence
Room 1 Room 2 Room 3 Room 4
2 Heat load
per room
3 (BTU/hr)
4 Available
wall space
(ft)
5 Minimum
Required
Heat Load
per linear
ft (BTU/ft)
ΔT =___ºF Supply temp(room1) =max supply
temp= _______ ºF
6 Total
heat load
(BTU/ft)
Q = __________BTU/Hr
7 Total loop
GPM GPM(loop) = Q / (500xΔT) = ______ GPM
8 Supply
temp per
room
____ºF ____ºF ____ºF ____ºF
9 List
possible
radiator
Models
and sizes