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.--Universidad de ChileFacultad de Ciencias Físicas y MatemáticasAlejandra Vargas CáceresEstudiante Ingeniería Civil Mecánica
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Heating Demand.jpg
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