1. Depending on the type of integration
the BIPV thermal models are described in different places. IntegratedSurfaceOutsideFace
typically uses the CTF model for surface heat transfer that includes internal
source/sink. This was originally implemented for radiant systems and is documented
in the Engineering Reference under Radiant System Models-> One Dimensional
Heat Transfer Through Multilayered Slabs. IntegratedExteriorVentedCavity
thermal model is described in Collector Heat Balance section under Solar
Collectors.
2. The convection coefficient models
depend on the temperatures involved and will account for the elevated
temperatures of an absorbing surface like PV.
The production of electricity in a PV
doesn’t create heat, the sun does. In the E+ model, the electricity
exported by PV is energy lost from the surface, not added. Electricity
production is considered an energy sink in the surface heat transfer models.
From:
Sent: Thursday, December 24, 2009
2:44 AM
To:
Subject: [EnergyPlus_Support]
Adding photovoltaic to the surface_heat transfer model
I have been using EP to model the performance of PV
electric generator and its effect on the thermal performance of the building.
My understanding is that the PV on the building surface absorbs solar radiation
and turns part of it into electric power. EP calculates the electric generation
using three models: Simple, EquivalentOne-
When PV turns solar radiation into usable electric power, heat is generated in
the cell, which leads to the increase of cell temperature and reduces the
performance efficiency of the PV cell. Plus, this changes the heat balance on
the building surface. It seems that EP considers this and offers "Heat
Transfer Integration Model". I can select from "Decoupled", "DecoupledUllebergD
I looked them up in the EngineeringReferenc
I would like to know:
1. Where can I find detailed information about how these heat transfer integration
models? I am aware that InputOutputReferenc
2. When adding PV, it drastically changes the convective heat transfer on the
building surface. The produced heat, i.e., rising temperature of the cell will
affect the heat transfer through the building surface. Does EP take these into
account and how?
Thank you very much for reading my long question!
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