[esp-r] Re: thermal mass inside a zone + thickness of walls in geometry

[Geissler Achim]

... on second thought, there is a third possibility, however, I am not sure this is already in the development_branch version of ESP-r and I do not know how you set this up (probably via a flow network): You can fill a zone with water.

Achim


-----Ursprüngliche Nachricht-----
Von: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von Geissler Achim
Gesendet: Mittwoch, 19. Oktober 2011 18:04
An: hannah.neumann at ise.fraunhofer.de; esp-r at lists.strath.ac.uk
Betreff: [esp-r] Re: thermal mass inside a zone + thickness of walls in geometry

Dear Hannah

In regard to (1), yes. You basically have two possible approaches available, IMO: 
(a) You can hang additional surfaces in the zone, this will add mass according to constructions, however, this will not reduce the air volume in the zone
(b) You can make a "zone in a zone", e.g. a protrusion from the floor in the desired dimensions. This will also add mass according to the constructions and it will reduce the air volume.

In regard to (2), all dimensions are internal, so no, the thickness of your construction is not taken into account. This is important especially for the calculation of a "equivalent" U-value or for entering thermal bridges - you need to use psi-values derived for internal dimensions, also.

Achim


-----Ursprüngliche Nachricht-----
Von: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von Hannah Neumann
Gesendet: Mittwoch, 19. Oktober 2011 13:48
An: esp-r at lists.strath.ac.uk
Betreff: [esp-r] thermal mass inside a zone + thickness of walls in geometry

Dear all,

I have got two questions:

1) Is it possible to insert thermal mass into a zone? I would like to exchange the air inside the zone by thermal mass or at least insert thermal mass into the zone and reduce the amount of air inside the zone.
If yes, how can it be done?

2) Are the dimensions I define in the geometry-file the inside or the outside dimensions of a room? Means, is the thickness of the walls, that is defined in the construction-file in any way considered in the geometry of the zone?

Thank you very much for your help!
Best regards,
Hannah


--
Dipl.-Ing. (FH) Hannah Neumann
Division Thermal Systems and Buildings
Fraunhofer Institut für Solare Energiesysteme ISE Heidenhofstraße 2, 79110  Freiburg, Germany
Phone:  +49 (0) 7 61/ 45 88 - 54 31    Fax:  +49 (0) 7 61/ 45 88 - 91 32
hannah.neumann at ise.fraunhofer.de
www.ise.fraunhofer.de

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