Abstract
A simplified model was developed to predict the radiative and convective heat transfer in complex fenestration systems, including the effect of solar radiation. The focus of the current work was on Venetian blinds mounted adjacent to the indoor window surface. From the perspective of convection, the model used a convective flat plate flow between the blind and ambient surroundings and a convective channel flow between the window and blinds. It was necessary to develop new empirical correlations to predict the average channel Nusslet numbers of the hot and cold walls separately. Therefore, a CFG study of free convection in an asymmetrically heated channel was performed. Then, the new empirical correlations were used to develop a simplified one-dimensional model of the heat transfer in the system. The radiative heat exchange between the blind, window and room was calculated using a four surface grey-diffuse model. Sample predicted results were compared with existing experimental and numerical data from the literature.
Highlights
Climate change is a major issue in the world.Increasing levels of carbon dioxide are affecting the world around us by increasing the temperature of the earth and decreasing the amount of snow and ice in the polar caps (IPCC 2007)
Even though the present study focuses on a Venetian blind located on the indoor window surface, a review of papers investigating the thermal effects of a Venetian blind located between window panes is beneficial because of the methods that can be used in the present study
Relative to the experimental results only, the constants have been significantly adjusted to fit the wider range of variables. Both the channel convective heat transfer coefficient and the flat plate convective heat transfer coefficient are increased as the blind slat angle increases, which is shown by the positive constants C) and C2
Summary
Climate change is a major issue in the world.Increasing levels of carbon dioxide are affecting the world around us by increasing the temperature of the earth and decreasing the amount of snow and ice in the polar caps (IPCC 2007). Many reports have been made addressing both the state of the environment and the affects of air pollution on world health Because of this concern about the environment, it is important to develop strategies for conserving energy. This chapter develops a two-dimensional numerical model to calculate the convective heat transfer data from each channel wall separately. This data will be used in the chapter to develop correlations for use in the simplified model. The comparisons of the experimental and numerical data (Machin et al 1998, Collins et al 2002b, and Collins 200 I) with the predicted results of the simplified model are presented in this chapter. There were two sum-squared error components that were calculated: the convection sum-squared error, ECOIlV, and the radiation sum-squared error, Erad, which were both determined by comparing the experimental results to the predicted results
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