An Experimental Investigation of the Passive Cooling of a Building Using Nighttime Radiant Cooling

Okoronkwo, C. A.; Nwigwe, K. N.; Ogueke, Nnamdi V.; Anyanwu, E.E.; Onyejekwe, D. C.; Ugwuoke, P. E.

doi:10.1080/15435075.2013.829775

Cited by 18 publications

(11 citation statements)

References 12 publications

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“…This average value corresponds well with the heat removal rates of 60 W/m 2 reported by Dobson (2005) and Okoronkwo et al, (2014).…”

Section: Cold Water Tanksupporting

confidence: 67%

“…Air-conditioning is an energy-greedy operation that is mostly accomplished by the use of vapour compression refrigeration systems (Okoronkwo et al, 2014). The conventional energy sources used in South Africa cause pollution and lead to an increase in environmental air temperatures, which is ascribed to the increased emission of greenhouse gas (GHG) (Winkler, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Modelling and testing a passive night-sky radiation system

Joubert

Dobson

2017

J. energy South. Afr.

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“…This average value corresponds well with the heat removal rates of 60 W/m 2 reported by Dobson (2005) and Okoronkwo et al, (2014).…”

Section: Cold Water Tanksupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Modelling and testing a passive night-sky radiation system

Joubert

Dobson

2017

J. energy South. Afr.

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“…The lower installation cost and the simplicity of the system are among the advantages of the air-based system, while the water-based system is better in terms of cooling performance because water has a higher heat capacity than air. It is important to note that the effectiveness of the heat transfer between the emitter and the fluid has also been the focus of investigations for both the water-and air-based RC [11,[57][58][59]. The investigations prescribed the optimum mass flow rate of the fluid to obtain the maximum cooling effect, as Hosseinzadeh and Taherian [57] indicated that the mass flow rate of the fluid is critical in achieving the best cooling performance of an RC emitter.…”

Section: Design Improvementmentioning

confidence: 99%

Implementation of Passive Radiative Cooling Technology in Buildings: A Review

SUHENDRI

et al. 2020

Buildings

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Radiative cooling (RC) is attracting more interest from building engineers and architects. Using the sky as the heat sink, a radiative cooling material can be passively cooled by emitting heat to the sky. As a result of the development of material technology, RC research has been revived, with the aim of increasing the materials’ cooling power as well as finding reliable ways to utilize it in cooling for buildings. This review identifies some issues in the current implementation of RC technologies in buildings from an architectural point of view. Besides the technical performance of the RC technologies, some architectural aspects, such as integration with architectural features, aesthetic requirements, as well as fully passive implementations of RC, also need to be considered for building application. In addition, performance evaluation of a building-integrated RC system should begin to account for its benefit to the occupant’s health and comfort alongside the technical performance. In conclusion, this review on RC implementation in buildings provides a meaningful discussion in regard to the direction of the research.

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“…It is widely reported that nocturnal radiation cooling is one of the most effective natural passive cooling technologies by infrared radiation exchange between earthly surfaces and the sky [1,2,3,4,5,6,7,8,9,10,11]. The sun radiates heat to the earth and warms it up during the day, but at night the warmer earth would radiate the heat to the then colder sky.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of a solar absorber and nocturnal radiator hybrid system for simultaneous water heating and cooling

Rabasoma

Kolobeng

Nwaigwe

2021

Heliyon

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An experimental study of a Solar Absorber and Nocturnal Radiator (SAANR) hybrid system used for simultaneous water heating and cooling in Gaborone, Botswana is presented. A SAANR hybrid system was designed and fabricated and the system consists of major components that include a 1.4 m 2 SAANR hybrid panel, 100 L hot and cool water storage tanks, chlorinated polyvinyl chloride (CPVC) plumbing and a 0.2778 kg/s circulation pump, all mounted on a steel frame that is inclined at 30 C to maximize solar absorption and self-cleaning of the panel. Experiments carried out in December 2020 in Gaborone with water at an initial temperature of 26 C produced 100 L of hot water at 60 C and similarly 100 L of cool water at 23 C, during the day and at night respectively. These results provide proof that the SAANR hybrid system could be used simultaneously for applications of domestic water heating and building envelope cooling in Botswana and similar climates. This technology can therefore be used instead of electric water heaters and air-conditioners and thus save energy.

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An Experimental Investigation of the Passive Cooling of a Building Using Nighttime Radiant Cooling

Cited by 18 publications

References 12 publications

Modelling and testing a passive night-sky radiation system

Modelling and testing a passive night-sky radiation system

Implementation of Passive Radiative Cooling Technology in Buildings: A Review

Experimental investigation of a solar absorber and nocturnal radiator hybrid system for simultaneous water heating and cooling

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