[TRNSYS-users] R 1347: Time-base, high insulation and high thermal mass combined with floor heating

[Noortje Alders]

Dear TRNSYS users,

I want to analyze the thermal behaviour of a dwelling with floor heating 
in detail. Attatched is a drawing of the floor construction. The 
time-base is set by 1 hour by default. I would like to set this 
time-base to a lower value (eg 15 minutes or less) to be able to analyse 
the reaction to change in occupancy with accordingly changing 
ventilation, heating setpoint and internal gain. However, the high 
thermla mass and high insulation value doesn't allow me to because the 
stability criteria are not fullfilled. ("Error creating the wall 
transfer coefficients: Stability criteria not fullfilled"). In a 
previous thread of the forum (
http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/2012-November/024387.html 
) I read that there is a "trick" for this. You can devide one layer in 
the ground floor (e.g. the concrete slab) with an active layer. However, 
if I try I get the message that only one active layer is allowed. Is 
there another way to tackle this problem?

Kind regards,

Met vriendelijke groet,
Noortje Alders


Postbus 696
2700 AR Zoetermeer
T: 079 3470309
E: n.alders at peutz.nl
W: www.peutz.nl
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