Re: [TRNSYS-users] R: R: WSHP - heat pump with radiant panel

[David BRADLEY <d.bradley@tess-inc.com>]

Jacopo,

  In addition to Jeff's comment about adding piping and making sure that you have a short timestep, the layout of the components looks correct; do make sure that the thermostat's "conditioning signal" output is connected to the liquid pumps so that there is flow only when there is active heating.

  The next step in debugging the simulation is to put in some Type65s (online plotters) and plot the mass flow and temperature of the liquid leaving each of the components in the loops of your system. This will tell you whether the system is operating as intended and just doesn't have enough capacity to keep the building up to temperature or if perhaps there is an incorrect connection somewhere among the components.

kind regards,

 David

On 06/16/2022 17:18, Jacopo Valente via TRNSYS-users wrote:

 

Da: Jacopo Valente via TRNSYS-users
Inviato: venerdì 17 giugno 2022 00:12
A: thornton@tess-inc.com; TRNSYS users mailing list at OneBuilding.org
Cc: Jacopo Valente
Oggetto: [TRNSYS-users] R: WSHP - heat pump with radiant panel

 

In my idea the thermostat controls the zone temperature of the type690 and gives the control signal to the heat pump.
I try to attach the image again.

 

Da: thornton@tess-inc.com
Inviato: giovedì 16 giugno 2022 23:53
A: TRNSYS users mailing list at OneBuilding.org
Cc: Jacopo Valente
Oggetto: Re: [TRNSYS-users] WSHP - heat pump with radiant panel

 

On 2022-06-16 16:19, Jacopo Valente via TRNSYS-users wrote:

> Equa 3 is the input for the lumped capacitance and this input is the
> sum between the loads and the “top surface heat transfer” of
> radiant floor. However i don’t understand why my system doesn’t
> work: it seams the pump doesn’t exchange and the output temperature
> remains constant.

Without seeing your project my first guess is that you don't have
anything turning the pumps on; the thermostat is only connected to the
heat pump.

Beyond that, PLEASE add some pipes between the components and make sure
you are operating at reasonable time steps - 5 minutes or so.

Jeff

----
Jeff Thornton
President
Thermal Energy System Specialists (TESS)
3 N. Pinckney Street - Suite 202
Madison WI 53703
(608) 274-2577
www.tess-inc.com

 

 

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-- 
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley@tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com