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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, ____________________________ arsenal
research Geschäftsfeld Nachhaltige Energiesysteme /
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