[esp-r] Re: phase change materials

[Arianna Sdei]

Hi Achim,
I am using phase change plasterboard via the active material database and I am using quite a bit of it. I am using it on all internal walls of two rooms in a house. It makes only a tiny difference to the temperature and I think I am not using it in the right way at the moment. I should be able to see a reduction of 1 or 2k but I am not. What can I look at? can the way I am positioning the material make any difference? I am trying to have the pcm exposed. Let me know,
Thank  you.
Arianna

From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Achim Geissler
Sent: 10 September 2014 18:16
To: esp-r at lists.strath.ac.uk Club
Subject: [esp-r] Re: phase change materials

Hi Arianna,

you write you can't see "substantial reduction" - but you do see a reduction? You will need quite a bit of PCM for substantial differences (.gt. 1 to 2 K), probably.

Which PCM model are you using? I think the basic "53" model cannot really take different temperatures for melting/solidification into account.

A simple approach for testing: If you have two otherwise identical surfaces, put the PCM in one and then look at the temperature profiles for a day for these surfaces (or split one of the PCM surfaces into two and remove the PCM from one of these). This should quickly give you an idea on if something is happening ("something" may be disappointingly small temperature differences).

Best
Achim



Von: esp-r-bounces at lists.strath.ac.uk<mailto:esp-r-bounces at lists.strath.ac.uk> [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von Arianna Sdei
Gesendet: Mittwoch, 10. September 2014 16:59
An: esp-r at lists.strath.ac.uk<mailto:esp-r at lists.strath.ac.uk> Club
Betreff: [esp-r] phase change materials

Dear All,

I am trying to use phase change materials, phase change plasterboard, via the active components. I am using a melting temperature of 26°C and a solidification temperature of 27°C. I am not sure about the solidification temperature and I would like to know if some of you can advise on this. I am trying to have the PCM exposed, so I always position it on the internal layer as I suppose when the software asks for the position it starts counting the existing layers from the exterior.

However I try, I can't see any substantial reduction in the indoor temperature during a hot summer month. Can any of you give some advice on how to reduce the indoor temperature further by changing the parameters?

Thank you in advance,

Best regards,

Arianna

Arianna Sdei

Research Fellow IFORE (Innovation For Renewal)

UNIVERSITY OF BRIGHTON

Moulsecoomb, Lewes Road, Brighton, BN2 4AT

mobile: 0044 (0)7981739024



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