Thermal and power behaviors of semi-transparent single-glazed photovoltaic (PV) window for office buildings in Hong Kong

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Thermal and power behaviors of semi-transparent single-glazed photovoltaic (PV) window for office buildings in Hong Kong

 

Author: Law, Kin-man
Title: Thermal and power behaviors of semi-transparent single-glazed photovoltaic (PV) window for office buildings in Hong Kong
Degree: M.Eng.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Office buildings -- China -- Hong Kong -- Energy consumption.
Solar energy -- China -- Hong Kong.
Building-integrated photovoltaic systems -- China -- Hong Kong.
Department: Dept. of Building Services Engineering
Pages: xiv, 126, [4] leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2303469
URI: http://theses.lib.polyu.edu.hk/handle/200/4455
Abstract: This paper develops an overall methodology for examining the thermal and power behaviors of semi-transparent single-glazed photovoltaic window for office buildings in Hong Kong. In order to estimate its overall energy performance, this study is conducted in terms of total heat gain, output power and daylight illuminance. Semi-transparent photovoltaic (STPV) is different from conventional opaque photovoltaic (PV) since it can be incorporated into the building envelope as glazing materials. It can also facilitate certain degree of solar radiation and natural daylight penetrating into the room. In addition, green power is generated by optimizing the solar energy resource. In order to determine the above three aspects: thermal, power and visual performance, three simulation models are established in this investigation. The first one is the one-dimensional transient heat transfer model, named as thermal balance model. It is used to evaluate the total heat gain from the STPV since the solar radiation may be transmitted, absorbed and reflected by the solar cell and glass layer. Other than heat transfer, power generation model and indoor daylight illuminance model are also developed to investigate the amount of output power and the indoor daylight illuminance level on the working plane respectively. In order to apply the above simulation three models, solar radiation from the Hong Kong Observatory is the essential parameter for appraising the overall energy performance of STPV module. The measurement is carried out between 2003 and 2007 of different orientations. Case study based on a typical office room is elaborated as reference as well. By incorporating the simulation results, the overall energy performance can be evaluated in term of electricity benefits corresponding to five orientations. The priority of applied installation is: south-east, south, east, south-west and west. The findings show that thermal performance is the primary consideration of energy saving in the entire system whereas electricity consumption of artificial lighting is the secondary consideration. The overall annual electricity benefits for water-cooled and air-cooled systems are about 900 kWh and 1300 kWh respectively. Therefore, semi-transparent PV glazed window does not only produce clean energy, but also help to reduce the cooling load and electrical lighting requirements in order to benefit our environmental and economic aspects.

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