[esp-r] Water flow network model

[wakana-m at ec.hokudai.ac.jp]

Dear all,

I study about ceiling radiation system.
So I'm trying to use water flow network.

As preliminary steps, I tried making simple model of water flow network 
model.
The model has three zones, a, b and c.
The number of nodes of flow network are three.
The node type are "internal:unknown". The nodes are associated with each 
zone.
The initial temperature of three zones are input.

I use constant mass flow rate component, type 35.
And three nodes are connected as below.
a ->b, b->c, c->a

I started its simulation. I chose "integrated simulation".
I input library name, simulation period, start-up period duration and 
time step.
After invoke simulation, the simulator was suddenly shut down.
When I use air flow network using same model, I could simulate it.

So I'd like to ask you how to modify my model.
We would really appreciate your advice.

Best regards,

Wakana Matsumoto