No mass flow in PlantLoop when adding Pipes

asked 2017-09-06 01:24:44 -0600

Hannes gravatar image

updated 2017-09-06 10:49:23 -0600

I´m modelling a hot water plant loop with several Water use connections.

Heat source is district heating, var. speed pump is in supply side. Set Point Manager is Scheduled.

When I run the simulation everything is fine, requested mass flows are met in each node, as well as setpoint temperatures.

But when i add indoor Pipes in front of the water use connections, to simulate the heat loss of circulating the hot water, there is no mass flow at all through them, even though the requested mass flow is the same as before.

Does anyone have an idea how i can model the plant loop with water use connections and indoor pipes for calculating the heat loss? I couldn´t find any special Requests for Pipe:Indoor in the documentation.

image description

Mass Flow is there as it should be until node 229. In every other node before the pipes is no mass flow at all, but in inlet node of supply side is the mass flow back agian.

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Comments

Can you open the resulting IDF file and post the resulting Pipe:Indoor object? (If OS 2.x is used, go to model/run/in.idf (replace model by whatever your model.osm is named)). Perhaps a picture of the OS App inspector showing the pipe:indoor object would be nice too.

Julien Marrec gravatar imageJulien Marrec ( 2017-09-06 02:59:15 -0600 )edit

Pipe:Indoor, ZI Zone 7, !- Name Pipe Construction, !- Construction Name Node 224, !- Fluid Inlet Node Name Node 267, !- Fluid Outlet Node Name Zone, !- Environment Type Thermal Zone 7, !- Ambient Temperature Zone Name , !- Ambient Temperature Schedule Name , !- Ambient Air Velocity Schedule Name 0.02208, !

Hannes gravatar imageHannes ( 2017-09-06 03:32:39 -0600 )edit