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At 23:03 11/26/2006, Aquila wrote:<br>
<blockquote type=cite class=cite cite=""><font size=2>1. Definition<br>
</font><br>
<font size=2>1)</font> <font size=2>inlet
temperature : is this the initial temp. of water after heating or the
initial temp. before heating?</font></blockquote><br>
the inlet temperature is simply the temperature of water that is entering
the floor. <br><br>
<blockquote type=cite class=cite cite=""><font size=2>2)</font>
<font size=2>gain : is this means the
basic heat gain for floor heating by the boiler or an additional heat
gain except the boiler?</font></blockquote><br>
I am not sure where the gain is applied to the fluid.<br><br>
<blockquote type=cite class=cite cite=""><font size=2>2. about ¡®min.
inlet mass flowrate¡¯<br>
</font><br>
<font size=2>1)</font> <font size=2>What¡¯s
the meaning and purpose of determining ¡®min. desired inlet mass
flowrate¡¯ ? And why the unit of it needs square meter(m2) ?
</font></blockquote><br>
the active layer is developed using a series of correlations that derive
in part from experimental results. The correlations are only valid within
certain ranges of floor thickness, tube diameter to spacing ratio, and
flow rate. It is okay if the fluid does not flow through the floor at all
(flow rate = 0) but if there is flow, then the flow must be above a
certain specific flow rate kg/h.m2. The area refers to the area of the
floor through which fluid is flowing. Information about the mathematics
of the active layer model can be found in section 6.3.2.4 of the
documentation set (manual 06-Multizone Building modeling with Type56 and
TRNBuild).<br><br>
<blockquote type=cite class=cite cite=""><font size=2>2)</font>
<font size=2>How the ¡®min. allowed inlet
mass flowrate¡¯ will be decided?</font></blockquote><br>
I believe that the minimum flow rate is simply 13 kg/h.m2.<br><br>
<blockquote type=cite class=cite cite=""><font size=2>3. about
¡®autosegmentation¡¯<br>
</font><br>
<font size=2>1)</font> <font size=2>What¡¯s
the exact relationship between ¡®min. desired inlet mass flowrate¡¯ and
the number of segmentation ?</font></blockquote><br>
if you want to use a smaller flow rate than is allowed for your actual
floor area, you need to break up the floor into a series of smaller
segments. To do so, enter the lowest flow rate that you want to be able
to use and click the autosegment button. The floor should be broken up
into its component parts automatically.<br><br>
<blockquote type=cite class=cite cite=""><font size=2>2)</font>
<font size=2>If the value of ¡®min.
desired inlet mass flowrate¡¯ is larger than ¡®min. allowed inlet mass
flowrate¡¯, the simulation don¡¯t work with the following error
message. Do I have to use autosegmentation always when I use the
active layer?<br>
</font><br>
¡® Specific fluid mass flow of active layer in surface 1 below minimum
value of <u>32.76 kg/m2h</u> Please, increase the minimum mass flow rate
or ?se the autosegmentation feature of TRNBuild for subdividing the
surface.¡¯</blockquote><br>
the error message means that your fluid mass flow rate is smaller than
the minumum allowable fluid mass flow rate. For a time there was a bug in
calculating the minimum and you would sometimes get the error even though
the actual flow rate was high enough. Make sure that you are using the
latest version (TRNSYS 16.1).<br><br>
Kind regards,<br>
David<br>
<x-sigsep><p></x-sigsep>
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