Experimental analysis on the active and passive cool roof systems for industrial buildings in Malaysia

Yew, Ming Chian; Yew, Ming Kun; Saw, Lip Huat; Ng, Tan Ching; Chen, Kah Pin; Durairaj, R.; Beh, Jing Han

doi:10.1016/j.jobe.2018.05.001

Cited by 48 publications

(17 citation statements)

References 21 publications

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“…However, in this study, the cooling effect of water sprinkling was limited on the air inside the greenhouse (the air temperature in greenhouse was reduced by only 1−2 • C), but had a significant effect on roof cooling (the decrease range was 10−12 • C). An active cooling method (for example, mechanical ventilation) [4] might help to improve the effect of roof water sprinkling on indoor air cooling, such that the heat transfer rate in forced-convection heat transfer is much bigger than that in natural convection.…”

Section: Discussionmentioning

confidence: 99%

“…Roof cooling has been widely used in building cooling energy saving, which can reduce roof surface and indoor temperature by reducing direct radiation and heat transfer [2,3]. A metal roof coated with thermal reflective coating (TRC) was proved to be able to significantly reduce roof temperature [4]. However, greenhouses need a certain degree of solar radiation for plants to grow, so a roof cooling method with a certain degree of transparency is needed.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Temperature Decrease in Greenhouses with Summer Water-Sprinkling Roof

Liu

Lü

2019

Energies

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Decreasing the temperature of a greenhouse in summer is very important for the growth of plants. To investigate the effects of a roof sprinkler on the heat environment of a greenhouse, a three-dimensional symmetrical model was built, in which a k-ε (k-epsilon) turbulent model, a DO (Discrete Ordinates) irrational model, a Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) algorithm, and a multiphase model were used to simulate the effects of the roof sprinkler, at different flow rates. Based on the simulation results, it was found that the temperature could be further reduced under a proper sprinkle rate, and the temperature distribution in the film on the roof was more uniform. A test was conducted to verify the accuracy of the model, which proved the validity of the numerical results. The simulation results of this study will be helpful for controlling and optimizing the heat environment of a greenhouse.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Temperature Decrease in Greenhouses with Summer Water-Sprinkling Roof

Liu

Lü

2019

Energies

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“…The reduction of energy consumption is a critical factor for urban sustainability. The main efforts are associated with achieving thermal comfort in residential and commercial buildings [1,2]. Different technologies and strategies are alternatives to the use of HVAC systems,which have been historically criticized for their high energy consumptions.…”

Section: Introductionmentioning

confidence: 99%

“…To quantify thermal reductions and energy savings of thermal coating solutions, experimental results are needed. They can be obtained from existing buildings, from experiments on a lab, where environmental conditions are controlled [2,15], or from a combination of both of them. In any case, the development of amathematical model would permit to extrapolate the results to different conditions.…”

Section: Introductionmentioning

confidence: 99%

A system to monitor and model the thermal isolation of coating compounds applied to closed spaces

et al. 2020

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Original scientific paper https://doi.org/10.2298/TSCI190525077M Smart control systems and new technologies are necessary to reduce the energy consumption in buildings while achieving thermal comfort. In this work, we monitor the thermal evolution inside a scale reduced closed space whose exterior and/ or interior wall faces have been painted with a coating solution. Based on the experimental data obtained under different environmental conditions, a simulator was developed and tuned to reproduce the thermodynamic behavior inside the spaces, with a relative error of less than 3.5%. This simulator lets us also estimate energy savings, temperature, and flux behavior under other conditions.

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“…These are called "cool coatings" since they show a high thermal emittance which induces a fast heat release to the surrounding environment. Cool coatings, also for roof applications, have been widely studied [7,[20][21][22][23][24][25][26][27][28][29][30][31].…”

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confidence: 99%

The Influence of NIR Pigments on Coil Coatings’ Thermal Behaviors

et al. 2020

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The effect of over-heating in urban areas, called the urban heat island effect (UHI effect), is responsible for greater energy consumption for cooling buildings. Several reflective near-infrared (NIR) coatings, called cool coatings have proved to be effective for contrasting the UHI effect. The thermal and appearance properties of cool coatings depend on the color and they often have been studied only at the initial state, without undergoing atmospheric degradation and soiling. In this work, the thermal, visual and durability behaviors of red and brown polyester-based organic coatings for roof applications were studied. All samples were subjected to accelerated degradation cycles composed of UV-B and salt spray chamber exposure. The sample degradation was assessed by infrared spectroscopy, gloss and colorimetric analyses. Moreover, the thermal behavior was studied by means of a simplified experimental setup. Finally, a soiling and weathering test was conducted to simulate the soiling of three years’ external exposure. Despite the phenomena of chemical degradation and a decrease in aesthetic properties, the samples maintain their thermal performance, which is not even influenced by dirt products. In addition, NIR pigments significantly improve the thermal behavior of brown coatings.

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Experimental analysis on the active and passive cool roof systems for industrial buildings in Malaysia

Cited by 48 publications

References 21 publications

Numerical Simulation of Temperature Decrease in Greenhouses with Summer Water-Sprinkling Roof

Numerical Simulation of Temperature Decrease in Greenhouses with Summer Water-Sprinkling Roof

A system to monitor and model the thermal isolation of coating compounds applied to closed spaces

The Influence of NIR Pigments on Coil Coatings’ Thermal Behaviors

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