[TRNSYS-users] Output problem Type 460 Hypocaust

Dear TRNSYS users,

I use TYPE 460 to simulate a hypocaust (air-to-soil exchanger). I added the parameter definition of my model. The model runs properly and the output parameters seem to be realistic (although one would expect to have more effect on air temperatures).

The output temperatures are realistic. However the output variables flow and velocity give strange results. The output values for Fair and Vair between 0 and 1 meter in the hypocaust are alright, but between 19 en 20 m the output value 0 is given. These outputs are bold in the file below. I investigated this problem and my conclusion is that only between 0 and 1 m in the hypocaust a value is given, regardless of the position of the output.

My question, is it possible that this is a error in type 460 or is something wrong in my model. It makes no sense that the velocity and flow have realistic values between 0 and 1 m and are have the value 0 after that section.

Thanks in advance.

Kind regards,

T. van Brakel

Parameter definition file:

************************************************

* TYPE 61 SUPPLIED PARAMETERS

*===============================================

* Nmod,Nsec,Nsoil,Nsurf,NI,NJ,NK [-]:

2 2 2 2 18 4 5

* DX [m]:

5.0000E+00 2.0000E+00 2.0000E+00 2.0000E+00

2.0000E+00 2.0000E+00 2.0000E+00 2.0000E+00

3.0000E+00 3.0000E+00 3.0000E+00 3.0000E+00

2.0000E+00 5.0000E+00

* DY [m]:

5.0000E+00 2.0000E+00 0.1000E+00 0.08860E+00

* DZ [m]:

1.0000E+00 0.1772E+00 1.0000E+00 0.80000E+00

7.0000E+00

* TypSec [-]:

1 1 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1

* TypSoil for front surface [-]:

0 0 0 0

* TypSoil for sec# 1 [-]:

1 1 1 1

0 1 1 1 1 0

0 2 2 2 2 0

2 2 2 2

* TypSoil for sec# 2 [-]:

1 1 1 1

0 1 1 1 1 0

0 1 1 1 0 0

0 1 1 1 1 0

0 2 2 2 2 0

2 2 2 2

* TypSoil for rear surface [-]:

0 0 0 0

* PosInf [-]:

1 1 1 1 1 1

* Kair0 [kJ/K m2],Kair1 [(kJ/K m2)/(m/s)]:

10.80E+00 14.2+00

* LamSoil [kJ/hr K m], CvSoil [kJ/K m3]:

1.08 1.3E+03

8.64 2.5E+03

* LamTub [kJ/hr K m], CvTub [kJ/K m3]:

0.612 1.3230E+03

* ThTub [m], CtubCor [-], Cfric [-]:

6.0000E-03 0.8862E+00 0.1000E-01

* TypWatFlow [-], Vwat [m/h]:

1 1 1

0.0000E+00 0.0000E+00 0.0000E+00

* NiniSoil,NiniWat [-]:

6 1

* TiniSoil [degC], PosIniSoil [-]:

0.30E+01 1 1 1 18 4 1

0.44E+01 1 1 2 18 3 2

0.58E+01 1 1 3 18 4 3

0.75E+01 1 1 4 18 4 4

0.86E+01 1 1 5 18 4 5

0.44E+01 3 4 2 13 4 2

* ThIniWat [m], PosIniWat [-]:

0.0000E+00

* Nopt [-]:

* TypOpt [-], PosOpt [-]:

1 3 4 2 4 4 2 !Tair, 0 - 2 m.

1 4 4 2 5 4 2 !Tair, 2 - 4 m.

1 5 4 2 6 4 2 !Tair, 4 - 6 m.

1 6 4 2 7 4 2 !Tair, 6 - 8 m.

1 7 4 2 8 4 2 !Tair, 8 - 10 m.

1 8 4 2 9 4 2 !Tair, 10 - 12 m.

1 9 4 2 10 4 2 !Tair, 12 - 14 m.

1 10 4 2 11 4 2 !Tair, 14 - 16 m.

1 11 4 2 12 4 2 !Tair, 16 - 18 m.

1 12 4 2 13 4 2 !Tair, 18 - 20 m.

23 4 4 2 4 4 2 !Fair, Flow rate 0 - 1 m.

23 11 4 2 11 4 2 !Fair, Flow rate 19 - 20 m.

24 4 4 2 4 4 2 !Vair, Velocity air 0 - 1 m.

24 11 4 2 11 4 2 !Vair, Velocity air 19 - 20m.

101 1 1 1 18 1 1 !Tsoil, T soil 0-1 m

101 1 1 2 18 1 2 !Tsoil, T soil 1-1.2 m

101 1 1 3 18 1 3 !Tsoil, T soil 1.2-2.2 m

101 1 1 4 18 1 4 !Tsoil, T soil 2.2-3 m

101 1 1 5 18 1 5 !Tsoil, T soil 3.0-10 m

10 3 4 2 13 4 2 !Tsoil, T hypocaust

15 3 4 2 13 4 2 !Psoil(0) Energy rate diffused