Drawing pipes
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The selection of the diameter of the pipes is explained in the following chapter of this Wiki "Select pipes" https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089367328/Select+pipes. Pipe length and pipe type are self-evident.
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The thermal losses can also be added to the pipes. If you click on the pencil on the right in the main parameter list, the pop-up shown below will appear. The classes that can be selected are based on the German standard DIN EN 12828.
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The isolation value changes depending on the pipe diameter, this is shown in the table below for class 1 to class 6. The thermal losses will be calculated during a dynamic simulation in the function of the pipe length, pipe diameter, isolation class, and environment temperature.
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But this is a very time-consuming job, therefore we advise using the isolation classes.
Class 1 | Class 2 | Class 3 | Class 4 | Class 5 | Class 6 | Custom | ||
DN15 | 0,279 | 0,247 | 0,216 | 0,187 | 0,1598 | 0,1344 | 0,063 | W/mK |
DN20 | 0,293 | 0,257 | 0,224 | 0,193 | 0,1642 | 0,1346 | 0,069 | W/mK |
DN25 | 0,312 | 0,277 | 0,236 | 0,202 | 0,1708 | 0,1424 | 0,077 | W/mK |
DN32 | 0,332 | 0,288 | 0,248 | 0,211 | 0,1774 | 0,1472 | 0,085 | W/mK |
DN40 | 0,352 | 0,304 | 0,26 | 0,22 | 0,184 | 0,152 | 0,092 | W/mK |
DN50 | 0,392 | 0,335 | 0,284 | 0,238 | 0,1972 | 0,1616 | 0,107 | W/mK |
DN65 | 0,451 | 0,382 | 0,32 | 0,265 | 0,217 | 0,176 | 0,127 | W/mK |
Example parameters for the custom isolation in the table above
Lamda Lambda isolation = 0,021 W/mK
Isolation thickness = 0,06 m
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bends, diameter transitions, and taps in the distribution grid
fittings such as collectors and closing, mixing, or controlling cranes
Devices devices like heaters, boilers, filters, batteries, heat exchangers, etc.
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The user only needs to fill in the ζ-values for the supply tube, Hysopt then calculates the additional pressure drop for the supply and return pipe.
In de following links can find some tables with ζ-values
Length surplus percentage
Instead of filling in all the ζ-values per pipe segment in Hysopt. The , the user can also choose to add a percentage extra pressure drop per pipe segment.
Depending on the tubing configuration of the installation, this percentage may vary from 10% to 40%, only when using steel pipes. With a normal configuration, a percentage of 20% can be held. In the case of an installation with many turns per meter, 30-40% can be held. When using a plastic tube, the percentage ranges from 50% to 70%, again depending on the tubing configuration.
Selecting pipes in Hysopt
After the action "compute Compute design flows" you go to the next step "Select pipes".
See https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089367328/Select+pipes for more information.