scholarly journals Active cool roof system for attic temperature reduction

2020 ◽  
Vol 476 ◽  
pp. 012131
Author(s):  
M C Yew ◽  
M K Yew ◽  
L H Saw ◽  
J H Beh
Keyword(s):  
Roof System ◽  
Cool Roof ◽  
Temperature Reduction ◽  
Active Cool

Integration of active and passive cool roof system for attic temperature reduction

2017 ◽  
Author(s):  
Ming Chian Yew ◽  
Ming Kun Yew ◽  
Lip Huat Saw ◽  
Rajkumar Durairaj
Keyword(s):  
Roof System ◽  
Cool Roof ◽  
Temperature Reduction ◽  
Passive Cool

Integration of thermal insulation coating and moving-air-cavity in a cool roof system for attic temperature reduction

2013 ◽  
Vol 75 ◽  
pp. 241-248 ◽  
Author(s):  
M.C. Yew ◽  
N.H. Ramli Sulong ◽  
W.T. Chong ◽  
S.C. Poh ◽  
B.C. Ang ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Air Cavity ◽  
Roof System ◽  
Cool Roof ◽  
Temperature Reduction ◽  
Insulation Coating

scholarly journals Rainwater Harvesting System Integrated With Sensors for Attic Temperature Reduction

2021 ◽  
Vol 7 ◽  
Author(s):  
Ming Chian Yew ◽  
Song Wei Wong ◽  
Ming Kun Yew ◽  
Lip Huat Saw
Keyword(s):  
Rainwater Harvesting ◽  
Comfort Level ◽  
Solar Irradiation ◽  
Small Scale ◽  
Airflow Rate ◽  
Halogen Lamp ◽  
Roof System ◽  
Technology System ◽  
Cool Roof ◽  
Solar Powered

This cool roof system focuses on utilization of rainwater harvesting systems by integrating the smart sensor to cool the roof and attic temperatures for the improvement of comfort level of building occupants. An ideal cool roof technology system is basically made up of these three components: (1) moving-air-cavity (MAC) ventilation, (2) solar-powered fan and (3) rainwater harvesting system. These three main components integrate to perform and control the cool roof system. Four small-scale cool roof models were designed and constructed to inspect the performance of the rooftop and attic temperatures. The experimental work was carried out indoors by employing the halogen lamp as the replacement for solar irradiation, while the ambient temperature is monitored to be around 29.8 °C throughout the test. The temperatures of the rooftop surface, MAC aluminum tube, and attic region were measured by K-type thermocouples to evaluate the performance of the cool roof designs. The solar-powered fans were incorporated into the MAC, which accelerated the airflow rate within the cavity and rejected the hot air out before transferring it to the attic region. Meanwhile, an innovative rainwater harvesting system was executed to cool the rooftop temperature rapidly by reducing the rate of heat transfer to the attic region. The result of this inventive cool roof system (Design Z) has successfully reduced the attic temperature by 10.8 °C compared to the normal metal deck roof model (Design W). The findings of the project revealed that the integrated cool roofing technology system comprises the ability to enhance the comfortability of building occupants toward a long-term sustainable development for a better world.

Active cool roof effect: impact of cool roofs on cooling system efficiency

2013 ◽  
Vol 7 (2) ◽  
pp. 209-221 ◽  
Author(s):  
Anna Laura Pisello ◽  
Mattheos Santamouris ◽  
Franco Cotana
Keyword(s):  
Cooling System ◽  
System Efficiency ◽  
Cool Roof ◽  
Cool Roofs ◽  
Active Cool

Field Tests of 4 Types of Cool Roof System to Reduce Cooling Load

2014 ◽  
Vol 1008-1009 ◽  
pp. 1336-1342
Author(s):  
Yi Ling Li ◽  
Jun Ichiro Giorgos Tsutsumi ◽  
Ryo Nakamatsu
Keyword(s):  
Field Tests ◽  
Cooling Load ◽  
Test Results ◽  
Cost Performance ◽  
Roof System ◽  
Cool Roof ◽  
Thermal Insulator ◽  
Water Pond ◽  
Rooftop Garden ◽  
Shading Device

This is a report on the performance of 4 types of cool roof system through field tests. Cool roof means solar protection on roof surface [1]. The tested systems were solar cells as a shading device, several types of thermal insulation paint as heat reflectors, a rooftop garden as an outside thermal insulator on a roof and a water pond on a roof as a coolant with sensible heat and evaporation. The test results indicated obvious temperature difference between the cool roof and the ordinary surface. The heat flux was calculated from the results to estimate the cooling load saving. Finally, these results were examined from the viewpoint of cost performance.

scholarly journals Thermal Performance Test of a Phase-Change-Material Cool Roof System by a Scaled Model

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Suk Goo Yoon ◽  
Young Kwon Yang ◽  
Tae Won Kim ◽  
Min Hee Chung ◽  
Jin Chul Park
Keyword(s):  
Temperature Distribution ◽  
Low Temperature ◽  
Surface Temperature ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Performance ◽  
Room Temperature ◽  
Roof System ◽  
Cool Roof ◽  
Change Material

General cool roof is effective for reduction of cooling load, but it has a problem of increasing heating load. Therefore, the purpose of this study is to complement the disadvantages of the cool roof system by utilizing phase change characteristics of phase change material (PCM). The study was carried out to verify the thermal performance of the PCM cool roof system by measuring the temperature on the top and bottom of the PCM cool roof system by making a miniature model (600 × 600 × 600 mm). PCM was inserted and not inserted, and the temperature difference according to the finish color (brown and white) was compared. As a result, the plate surface temperature using PCM was lower than that without PCM, and time-lag of temperature increase occurred. As a result of the comparison of temperature according to the finish color (brown and white), white showed a low temperature distribution up to 16.35°C. Even at room temperature, white maintained a low temperature distribution of 5.40°C than brown. The use of PCM cool roof system in roof finishes could lower the surface temperature and keep the room temperature low.

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