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Re: [TRNSYS-users] On using Type 653 radiant floor correctly

Javier,

I took a look at the code for Type 653 and found a small problem with the circuit definitions.  The pipe length entered as a parameter should be per circuit and I have added this clarification in the profroma.  But I also found and fixed a problem with the HX calculation with multiple circuits.   In the short term, just use 1-circuit in your model and put in the total pipe length for all of the circuits.  To get more energy into and out of the slab, you'll simply have to increase the inlet flow rate as the heat transfer is a simple effectiveness solution.

 

Jeff

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com

On 05/09/2017 10:59 am, Javier Vega via TRNSYS-users wrote:

Hello TRNSYS users,
 
I'm using a Type 653 radiant floor to transfer energy to a TRNSYS Type 56 building. I'm using the model in "Mode 1", which means the module is not coupled to Type 56 but it computes all outputs through an energy balance. Then, I transfer the energy to the thermal zone as a Gain Input.
 
My first design, lead me to set 1600 (kg/h) of water flow on Type 653. Nonetheless, the system behaviour made me rise the flow to somewhat 2500 (kg/h) to meet thermal confort.
 
This would lead to water speeds to high in the circuit, so it's unrealistic. So I want to set the design to maybe 3 parallel circuits.
 
The thing is, I don't understand well how the module should be used then. If I set 3 identical parallel circuits in Parameter 19, should I set in Parameter 16 "Total pipe lenght" the sum of the 3 circuits or the length of each one?
 
Either way, in both scenarios I obtain less energy gains than with a sole circuit. I don't really understand why this happens if the heat transfer is considered with an effectiveness approach. It is supposedly the same total inlet flow with the same temperature and the same effectiveness assumption.
 
Kind regards,
Javier Vega
 
 

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