[TRNSYS-users] About heating output of type 927

[Ale Vargas]

I'm sorry, I forgot the image of heating demand of my house

Kind regards,

Alejandra.

2018-04-23 20:04 GMT-03:00 Ale Vargas <ale.varc93 at gmail.com>:

> Hello everyone! I'm working on the design of a hybrid heating system (for
> a house) composed by a ground source heat pump and solar collectors
> (flat-plate collectors). As a first step, I decided to model (with TRNSYS
> 17) the system without flat-plate collectors (just ground source heat pump)
> to analize the behavior of the system without hybridization.
>
> At first, I modeled the house without the heating system to define the
> heating demand (with "ideal heating type" defined in TRNBuild). The graph
> of hourly heating demand during 1 year makes sense (climate of Santiago,
> Chile, Sudamérica), with higher demand in July and smaller in January (I
> attached the graph in this email as "Heating Demand").
>
> Then, I modeled the control system with type 2b,  the house with type 56,
> the heat pump with type 927 and the ground source heat exchanger with type
> 997. I defined the active layer to model radiant floor, and I connected
> everything between types to simulate. I plotted the heating output of the
> heat-pump, and I should have the same curve as the heating demand, but it
> is quite different  (I attached the graph in this email as "Heating
> Output 1")
>
> So, I changed the radiant floor to type 653 (Simplified radiant floor),
> and I removed the active layer. Then, I obtained another graph, that is
> quite different to the heating demand too (I attached the graph in this
> email, as "Heating Output 2")
>
> I attached the input file (as "Input File 1".txt and "Input File 2".txt)
> and a image of the simulation studio of the first and second situation
> previously described as "Simulation Studio 1.jpg" and "Simulation Studio
> 2.jpg" (the first with active layer and the second one without active
> layer).
>
> I defined the time step to 1 minute in last case, and 1 hour in the first
> one, I plotted the temperatures inside the house (in both cases) and it
> seems to be right but I don't know why heating output of heat-pump is
> different to the heating demand... (ok, I understand that both graphs have
> to be different, but in this situation is very different than expected!) My
> system delivers more heat in May than in July or August, and it doesn't
> make sense. I have spent a lot of time trying to fix this situation!!
>
> So...My questions are:
>
> *1. Why the difference between heating demand of the house and heating
> output of the system is too large*? It seems to be wrong.
>
> *2. Which outputs of type 653 (simplified radiant floor) corresponds to
> the heat that radiant floor delivers to the house? I plotted "Top Surface
> Heat Transfer", but the heat that delivers is too small...*
>
> I would be very grateful if someone can help me to solve this problem!!!
>
> Kind regards,
>
> Alejandra.
> --
>
> *Alejandra Vargas Cáceres*
>
> *Estudiante Ingeniería Civil Mecánica*
>
> *Facultad de Ciencias Físicas y Matemáticas*
>
> *Universidad de Chile *
>



-- 

*Alejandra Vargas Cáceres*

*Estudiante Ingeniería Civil Mecánica*

*Facultad de Ciencias Físicas y Matemáticas*

*Universidad de Chile *
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