Numerical analysis of heat transfer and airflow in double skin facades integrated with amorphous silicon PV cells

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Numerical analysis of heat transfer and airflow in double skin facades integrated with amorphous silicon PV cells

 

Author: Sun, Mingqing
Title: Numerical analysis of heat transfer and airflow in double skin facades integrated with amorphous silicon PV cells
Degree: M.Eng.
Year: 2015
Subject: Heat -- Transmission.
Fluid dynamics.
Facades.
Building-integrated photovoltaic systems.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: viii, 46 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2826135
URI: http://theses.lib.polyu.edu.hk/handle/200/8227
Abstract: In recent years, building energy consumption in space air-conditioning have increased, and the solar heat and loss via glass curtain walls are responsible for a large portion of this load. Apparently the improvements in developing new types of glass curtain wall is needed. During the past years, advanced semi-transparent PV glazing systems have been developed and applied in buildings in HongKong. Semi-transparent building windows integrated with photovoltaics (BIPV), different from conventional PV technology, can not only generate electricity, such see-through amorphous silicon (a-Si) PV facades can also enhance daylight utilization and function as building envelops. Double skin facade technology is reported in this paper. With appropriate optimization measures adopted, such double-glazing facades (DFS) can reduce the heat losses in winter and heat gains in summer respectively via the building envelopes.This dissertation presents a numerical analysis of heat transfer and air flow dynamics based on the preliminary experimental results. Different two-dimension models were performed in Computational Fluid Dynamics platform to investigate the complex phenomenon in velocity and temperature fields with mixed radiation and natural convection heat transfer considered. Standard k-ε turbulence model was employed to solve the problem.Experimental results indicate that the air velocity field is a consequence of non-uniform distribution of the temperature field. The air flow in the cavity affect the thermal behavior and energy performance of the PV-DSF system. The later analysis of the simulation results illustrates that the variation of the air cavity width and inlet opening size considerably affected the total performance of the PV-DSF system. The comparison of the numerical models clarified that the optimum design configuration with cavity width L=0.1m and inlet opening height H0=0.2m achieved outstanding performance in terms of thermal and energy behavior.

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