Re: [TRNSYS-users] type 703 parameters

["eleni ampatzi" <eampatzi@googlemail.com>]

Dear David and Abdullahi,

Thank you very much for the replies. Just one more question. What about parameter No 22 'Slab U-value'? Do I need to calculate this in type 56 for the specific floor element (and which N-type is this, I am using TRNSYS 16_1 and I cannot find this out) and pass it on type 703? The manual says that this is not required, but it is confusing for me, since it is one of the parameters of the type. Thank you in advance,

Best Regards

Eleni

2008/12/8 <aa1@brighton.ac.uk>

Eleni,

 

You can have some of the parameters for Type 77 from the NASA Surface Meteorology and Solar Energy database. You can have the annual average, monthly average and annual amplitude of soil surface temperature that you can use as inputs to Type 77 for any location around the world. I think you will need to register before you can have access to the database.

 

Best regards

Abdullahi

 

Abdullahi Ahmed (BSc. MSc.) Postgraduate researcher

School of the Environment

University of Brighton

Cockcroft Building

Lewes Rd.

Brighton

BN2 4GJ

 

Tel: +44 01273 643455

 

-----Original Message-----
From: David Bradley [mailto:bradley@tess-inc.com]
Sent: 08 December 2008 18:53
To: eleni ampatzi
Cc: trnsys-users@cae.wisc.edu
Subject: Re: [TRNSYS-users] type 703 parameters

 

Eleni,
  Sorry for the delay in getting back to you. I think that "undisturbed" in this case is just referring to the temperature of soil far enough away from the building that it is not affected by anything other than the time of year and depth. You can use the Type77 Ground Temperature model to get the soil temperature. A good guess for the average annual deep earth soil temperature is the average annual air temperature. The amplitude is the difference between the maximum average monthly temperature and the minimum average monthly temperature (you should be able to figure that out from the data file). The shift is the day on which the minimum temperature occurs and again should be obtainable from the weather file.
Kind regards,
 David


eleni ampatzi wrote:

Dear All,

I am using type 703 and I have a question regarding parameters 8,9,10 which refer to the surface temperature- temperature of undisturbed soil. What does 'undisturbed soil' mean exactly? I can get measurements from local weather stations regarding the soil temperature at various depths; hourly values measured at 10cm depth, daily values taken at 9am for 30cm and 100cm depth.

If I use average soil temperature measurements for 10cm depth, would that be a correct dataset to use in orfed to derive mean surface temperature, amplitude of surface temperature and day of min surface temperature? Would surface temperature differ a lot from the soil temperature at 10cm? Thank you in advance

Best Regards

Eleni

--
Eleni Ampatzi
PhD Candidate
Welsh School of Architecture
Cardiff University

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-- 
Eleni Ampatzi
PhD Candidate
Welsh School of Architecture
Cardiff University