[TRNSYS-users] Cooling with lake water

Diego A. Arias daarias at wisc.edu
Fri Apr 21 06:36:20 PDT 2006

Dear Johan,

I do not know of any component that models the behavior of a stratified 
However, you may want to try Type 4, which simulates the performance of 
a storage tank subject to thermal stratification.  The tank is divided 
in N nodes, and energy balance equations are solved for each one of the 
However, there are a couple of issues to take into account:
- Type 4 was developed having domestic hot water applications in mind, 
i.e., the objective is to heat the water and the magnitude of the volume 
is very different.  Type 4 has 3 operation modes: Mode 1 and 2 have 
fixed locations for the source and load streams,  and the location of 
the load stream in these two modes is at the highest point of the tank 
(highest temperature).  You could use Mode3, which allows you to specify 
the nodes where the load and source streams are located.
- You can use 2 heating elements in Type 4.  I think that you could use 
them to simulate an energy input from the sun.

Please let me know what you think about this strategy.  If you find that 
Type4 does not suit your needs, I can help you developing a new component.
Best regards,


Desmedt Johan wrote:
> Dear TRNSYS users,
> I'm looking for a type in TRNSYS for simulating a pond or lake with 
> water (volume: 600000 m³, depth: 10 m) for cooling purposes. The 
> temperature at the bottom of the lake is around 6°C.  Is there a type 
> available in the TRNSYS library which could could serve for this 
> application? A model with stratification possibilities would be nice.
> Thanks a lot!!
> Johan Desmedt
> ========================================
> Johan Desmedt
> Expertisecentrum Energietechnologie
> Boeretang 200
> B-2400 Mol (Belgie)
> tel: +
> fax: +
> email: johan.desmedt at vito.be
> http:\\www.vito.be
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