[TRNSYS-users] concrete core cooling modelled with active layer
Pol Olivier
Olivier.Pol at arsenal.ac.at
Tue Feb 6 06:43:58 PST 2007
Dear TRNSYS users,
I am modelling a concrete core cooling (activation of storage mass of slabs) with an active layer (with TRNSYS 16.01).
Relevant data are:
- distance to edge of the slab: 12cm
- pipe spacing: 20cm
- flow mass: 12kg/h.m²
- Temperature of supply air into the rooms: 19°C
According to the definition of outputs for a surface, the energy abstracted from the room into the slab should be QCOMI and QCOMO (considering both l-wave radiation and convection).
My results are:
- inlet temperature 19°C, QCOMImax=15W/m²
- inlet temperature 17°C, QCOMImax=20W/m² (average air temperature in summer: 21°C)
- inlet temperature 17°C, without cooling of supply air, COMImax=25W/m² (average air temperature in summer: 22°C)
The values I obtain for QCOMI and QCOMO are much lower than the ones obtained in the practice (usually between 40 and 60W/m²).
I tried different variations (simulation time step, distance to the edge of the slab, flow mass and auto-segmentation, internal calculation of convective heat transfer coefficient, number of loops) without success...
Are QCOMI and QCOMO the right outputs?
Thank you for your suggestions,
Olivier Pol.
____________________________
arsenal research
Geschäftsfeld Nachhaltige Energiesysteme /
Business Field Sustainable Energy Systems
DI Olivier Pol
Austria, 1210 Vienna, Giefinggasse 2
ph: +43 (0) 50550-6592, f: +43 (0) 50550-6613
mobile: +43 (0)664/ 62 07 890
olivier.pol at arsenal.ac.at <mailto:olivier.pol at arsenal.ac.at>
www.arsenal.ac.at <http://www.arsenal.ac.at/>
_________________________
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