Flow- And Temperature-Field Visualization of a Window With a Heated Louvered Blind

Naylor, David; Duarte, N.; Petryk, James D.; Machin, Alan

doi:10.1615/jflowvisimageproc.v7.i3.50

Cited by 9 publications

(4 citation statements)

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“…It was also noticed r that the presence of the blind reduces the radiative heat transfer significantly, even at a blind slat angle of 0°. Similar experimental studies were performed by Naylor et al (2000) and Duarte et al (2001).…”

Section: Studies Related To a Venetian Blind Located On The Indoor Window Surfacesupporting

confidence: 62%

A simplified model of the thermal interaction of a Venetian blind located on the indoor glazing surface of a window

Roeleveld¹

2021

Preprint

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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.

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Section: Studies Related To a Venetian Blind Located On The Indoor Window Surfacesupporting

confidence: 62%

A simplified model of the thermal interaction of a Venetian blind located on the indoor glazing surface of a window

Roeleveld¹

2021

Preprint

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“…In Figure 3, the blind spacing is B=L ¼ 0:066 and the slat angle is f ¼ 08: It can be seen that the numerically predicted isotherms agree closely with the experimental fringe pattern. In Figure 3(b), a comparison is made between the stream function contours and the experimental flow visualization photograph of Naylor et al (2001). The general cellular flow structure between the louvers is the same and Comparisons were also made with the convective heat transfer rates predicted by CFD and the experimental measurements of Machin et al (1998).…”

Section: Cfd Solution Of the Free Convection At The Indoor Glazingmentioning

confidence: 99%

A simplified method for modelling the effect of blinds on window thermal performance

Naylor

Shahid

Harrison

et al. 2006

Int. J. Energy Res.

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SUMMARYAn approximate method is presented for predicting the effect of a louvered blind on the centre-glass thermal performance of a fenestration. The method combines a one-dimensional heat transfer model with data from a numerical simulation of the window and blind. Sample results for a blind mounted on the indoor surface of a window show the effect of blind slat angle on heat transmission. Both summer and winter conditions are considered. The results show that a louvered blind can improve the U-value of a standard double-glazed window by up to 37%. Also, the radiation heat exchange with the room can be dramatically reduced (by up to 60%), which will improve the level of occupant comfort. However, there was found to be a trade-off between U-value and occupant comfort; placing the blind closer to the window improves the U-value, but increases the radiation heat exchange with the room. The predictions from the present simplified method compare well with results from a full two-dimensional computational fluid dynamics solution of the conjugate blind/window interaction.

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“…An experimental study of the interaction of a heated blind and a window glazing was done by Naylor et al (2000). A set of blinds was electrically heated to simulate the heat absorption from solar radiation and was placed adjacent to an isothermal plate.…”

Section: Indoor Adjacent Blind Studiesmentioning

confidence: 99%

An interferometric study of free convection in a window with a heated between-panes blind

Almeida¹

2021

Preprint

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An experimental study has been conducted to examine free convection in a window with an enclosed aluminum Venetian blind. The unique feature of this experiment was that the blind slats were heated electrically to simulate absorbed solar radiation. Centre-glass convective heat transfer measurements and temperature field visualization were obtained using a laser Mach-Zehnder interferometer. Measurements were made for three plate (glazing) spacings, three blind slat angles, three blind heat fluxes, and two plate temperature differences. It was found that a recently proposed simplified model, called the Reduced Slat Length (RSL) model, closely predicted the experimental results when the flow appeared to be laminar and steady. Under these conditions, the temperature field and lateral heat transfer was dominated by conduction. Under some conditions, evidence of highly unsteady/turbulent flow was observed. As expected, the RSL model performed poorly under these conditions.

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Flow- And Temperature-Field Visualization of a Window With a Heated Louvered Blind

Cited by 9 publications

References 0 publications

A simplified model of the thermal interaction of a Venetian blind located on the indoor glazing surface of a window

A simplified model of the thermal interaction of a Venetian blind located on the indoor glazing surface of a window

A simplified method for modelling the effect of blinds on window thermal performance

An interferometric study of free convection in a window with a heated between-panes blind

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