Simulation Of A Full Scale Trombe Wall System
Author(s)
R. L. Frederick & F. Acuña
Abstract
Two dimensional transient modelling of the flow and heat transfer in an
idealized Trombe wall system was performed for a fixed set of physical
dimensions. The governing equations were solved using multiphysics software.
Buoyancy and thermal accumulation in a brick wall are the main effects
considered. During operation, the solid and fluid temperatures constantly
increase, while circulation flow rates, which are significant from the start, show a
slow decrease. The room is heated by the parallel mechanisms of buoyancy flow
from the collector space and directly by the hot wall, but the latter effect
becomes progressively more important. Heat losses through the glazed surfaces
of room and collector are of similar magnitude. However, when the wall
clearances are closed the collector loss shows an important increase. The role of
the typical Trombe wall circulation in the control of heat losses is discussed.
Keywords: Trombe wall system, natural convection, numerical models.
1 Introduction
In this paper a two dimensional simulation of a conventional Trombe wall
system is described. The importance of passive solar heating systems in latitudes
that favour winter solar collection on vertical walls has increased in recent years.
These systems are known to depend on buoyancy as the main driving force for
air flow, and on the accumulation of energy by a massive wall for thermal
comfort in periods of time without solar energy input [1, 2]. Given the low flow
rates that occur in such devices, the Trombe wall system is a very interesting
subject for numerical simulation, especially because the experimentation in such
systems is still relatively expensive.
The thermal performance of Trombe wall systems has been studied by
experimental and numerical methods. Numerical predictions of the thermal
Keywords
Trombe wall system, natural convection, numerical models.
Related Book
Other papers in this volume
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