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RE: [EnergyPlus_Support] Chilled ceiling with available conrete ceiling for passive cooling

Geert,

A couple of comments on your question 1:

a) You can define the chilled ceiling over a sub-surface of the ceiling (e.g. a door in EnergyPlus terminology). If you are using DB you can associate the chilled ceiling with a sub-surface simply by setting the internal source option for the sub-surface construction but not for the main background ceiling construction.

b) Have you considered modelling the chilled ceiling as a passive chilled beam? Because of the gap between the main concrete ceiling construction and the finned tubes this may be more appropriate?

My guess in answer to Question 2 is that no, the chilled ceiling assembly will block radiation exchange between the concrete ceiling and the occupants/rest of zone.

Regards,

Andy

Andy Tindale
DesignBuilder Software Ltd
www.designbuilder.com
Tel: +44 (0)1453 755500


-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Geert Bellens
Sent: 30 July 2013 12:14
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Chilled ceiling with available conrete ceiling for passive cooling

I've been asked to simulate an office with a chilled ceiling (metal plates with tubes filled with cold water).

The office has this chilled ceiling for +- 75% of the surface. 

The ceiling is hanging beneath the concrete ceiling. Leaving a space (+- 20 cm)between them.

This space has to make passive nightcooling possible. At night cool outdoor air can cool the concrete ceiling.

Two questions:

1) modelling the chilled ceiling is no problem. But the concrete wont be 'visible' for natural nightcooling for 75% of the surface. Anyone an idea how to model that ?

2) Is this really effective ? Suppose the concrete ceiling is cooled by natural nightventilation. Does the radiation of the concrete slab has an effect on the buildinguser, if there is a chilled ceiling between them ?

Geert





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------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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