Comprehensive evaluation of thermal and energy performance of radiative roof cooling in buildings

Chen, Jianheng; Lu, Lin

doi:10.1016/j.jobe.2020.101631

Cited by 34 publications

(17 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cities of Kunming, Hong Kong, Shanghai, Beijing, and Harbin can achieve energy saving rates of 9.3%, 7.1%, 4.1%, 3.3%, and 0.6% due to the different climates. 99 Even though the cooling in the winter period would increase the energy input while the cooling load savings surpassed the heating load penalties. A cool roof can save annual cooling energy of 33-57 USD m À2 for the topfloor residential units with a short payback period (< 6 months).…”

Section: Space Coolingmentioning

confidence: 99%

“…For example, as shown in Figure 14B, the cooling load savings are generally higher than the heating load, resulting in positive annual energy savings. The cities of Kunming, Hong Kong, Shanghai, Beijing, and Harbin can achieve energy saving rates of 9.3%, 7.1%, 4.1%, 3.3%, and 0.6% due to the different climates 99 …”

Section: Applications and Challenges Of Pdrcmentioning

confidence: 99%

“…(B) Annual building energy consumptions and savings in five typical cities: Beijing, Harbin, Hong Kong, Kunming, and Shanghai. Source : Reproduced with permission: Copyright 2021, Elsevier 99 (C) A schematic of the piping configuration in the test set‐up, highlighting the presence of an air‐cooled radiator (to bring the fluid inlet to the panels to the ambient air temperature), pump and tank.…”

Section: Applications and Challenges Of Pdrcmentioning

confidence: 99%

“…8,98 The first way to apply PDRC is to directly apply a passive PDRC coating on a terrestrial entity that needs to be cooled, such as the cooling roof is shown in Figure 14A. 98,99,[101][102][103][104][105][106][107][108][109] Roofs in most residential buildings are exposed to substantial solar radiation during the daytime, resulting in a high roof temperature (up to 60 C). This heat is transferred to the living space, placing a higher cooling load on the air conditioner.…”

Section: Space Coolingmentioning

confidence: 99%

See 3 more Smart Citations

Passive daytime radiative cooling: Fundamentals, material designs, and applications

Chen

Pang

Chen

et al. 2021

EcoMat

View full text Add to dashboard Cite

Passive daytime radiative cooling (PDRC) dissipates terrestrial heat to the extremely cold outer space without using any energy input or producing pollution. It has the potential to simultaneously alleviate the two major problems of energy crisis and global warming. In this review, we summarize general strategies implemented for achieving PDRC and various applications of PDRC technologies. We first introduce heat transfer processes involved in PDRC, including radiative and nonradiative heat transfer processes, to evaluate the PDRC performance. Subsequently, we summarize the general material designs used for controlling PDRC performance, such as tuning the thermal mid-infrared emittance and solar reflectance. Finally, we discuss the diverse applications of PDRC technologies to overcome problems in space cooling, solar cell cooling, water harvesting, and electricity generation.

show abstract

Section: Space Coolingmentioning

confidence: 99%

Section: Applications and Challenges Of Pdrcmentioning

confidence: 99%

Section: Applications and Challenges Of Pdrcmentioning

confidence: 99%

Section: Space Coolingmentioning

confidence: 99%

See 2 more Smart Citations

Passive daytime radiative cooling: Fundamentals, material designs, and applications

Chen

Pang

Chen

et al. 2021

EcoMat

View full text Add to dashboard Cite

show abstract

“…The MAC was inclined with an angle that was designed based on the characteristic of fluid thermal expansion which enhanced the convective velocity of the air inside the cavity. According to the researcher Pradhan, the convective velocity of the heated surface will increase as the angle of inclination increases (Abhijit et al, 2019;Chen and Lu, 2020). In this case, the heat energy trapped in the attic region will be transferred to the MAC which reduces the temperature inside the attic region.…”

Section: Comparison Of Attic Temperaturementioning

confidence: 99%

Rainwater Harvesting System Integrated With Sensors for Attic Temperature Reduction

Yew¹,

Wong²,

Yew³

et al. 2021

Front. Built Environ.

View full text Add to dashboard Cite

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.

show abstract

Developing a Coupled Spectral-Dependent Radiative Cooling and Building Energy Model

Yu,

Chen

2023

Environmental Science and Engineering

View full text Add to dashboard Cite

Comprehensive evaluation of thermal and energy performance of radiative roof cooling in buildings

Cited by 34 publications

References 50 publications

Passive daytime radiative cooling: Fundamentals, material designs, and applications

Passive daytime radiative cooling: Fundamentals, material designs, and applications

Rainwater Harvesting System Integrated With Sensors for Attic Temperature Reduction

Developing a Coupled Spectral-Dependent Radiative Cooling and Building Energy Model

Contact Info

Product

Resources

About