Building control strategies were then developed to take advantage of the PCM s latent heat capacity

Document Sample
Building control strategies were then developed to take advantage of the PCM s latent heat capacity Powered By Docstoc
					                                       Abstract
The combination of building structure, renewable components, and management
systems provides new opportunities for exploiting natural energy and minimising impact
on the environment. Using hybrid solutions that integrate different sources of renewable
energy and demand reduction components constitutes an effective way to improve
overall energy efficiency and create appropriate load profiles for the local deployment of
alternate energy sources. In the present work, phase change material (PCM) is employed
to lower the temperature of a photovoltaic (PV) panel to ensure maximum cell efficiency
and protect cells from excessive heat. This hybrid system, termed PV/PCM, allows the
stored heat to be recovered using air or water flow. The behaviour of the PCM will be
altered by the fact that the thermal properties of specific heat, density and conductivity
are continually changing, with new values depending on the context temperature and
the phase change temperature range. The PCM behaviour is represented by a new
algorithm, which was constructed, validated, and incorporated within a state-of-the-art
building energy simulation program, ESP-r, with interactions taking place between PV
and PCM physical models. Building control strategies were then developed to take
advantage of the PCM’s latent heat capacity, especially under peak load operation or
when high PV temperature is observed. The integration of building control systems with
the charging-discharging of the PCM layer enables the program user to control the
quality and efficiency of these processes, and allows for the optimal use of the thermal
energy stored.

The thesis describes the form of the developed PV/PCM model and presents the results
from its empirical validation. Finally, the thesis applies the new model to investigate the
impact on building energy efficiency of deploying PV/PCM in practice.

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:14
posted:10/3/2012
language:English
pages:1