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Dynamic Design Concepts for Hot Climatic Conditions
Published in Neha Gupta, Gopal Nath Tiwari, Photovoltaic Thermal Passive House System, 2022
Radiative cooling can be classified as (i) direct or passive and (ii) hybrid radiative cooling. In passive radiative cooling, the building envelope radiates towards the sky and gets cooler, producing a heat loss from the interior of the building. However, in hybrid radiative cooling, the radiator is not the building envelope but usually a metal plate. The operation of such a radiator is the opposite of an air flat-plate solar collector. Air is cooled by circulating under the metal plate before being injected into the building. Other systems are combinations of these two configurations [4].
Radiative cooling in buildings for climatic concept of Morocco
Published in Paul Fazio, Hua Ge, Jiwu Rao, Guylaine Desmarais, Research in Building Physics and Building Engineering, 2020
T. Mouhib, M. Benlattar, A. Mouhsen, M. Harmouchi, E.M. Oualim, P. Defrance, J.P. Vigneron
Radiative cooling techniques are based on the principle of heat loss by long-wave radiation emissions, from a body towards another body of lower temperature, which is regarded as the heat sink. In the case of buildings the cooled body is the building and the heat sink is the sky, since the sky temperature is lower than the temperatures of most of the objects upon the earth, Argiriou (1995).
Effects of pigment volume concentration on radiative cooling properties of acrylic-based paints with calcium carbonate and hollow silicon dioxide microparticles
Published in International Journal of Sustainable Energy, 2023
Sarun Atiganyanun, Pisist Kumnorkaew
Space cooling is a significant part of the global energy demand. In 2020, 16% of the total worldwide electricity consumption was used for cooling in buildings alone (International Energy Agency 2021). As the contemporary climate change accelerates a rise in the average global temperature, the demand for this energy usage will further increase in a near future. Without meaningful improvements in cooling technologies, it is projected that energy globally used for cooling will surpass that for heating by 2060 (Isaac and van Vuuren 2009). Especially in southeast Asian countries, the electricity demand from cooling sectors is predicted to increase by 200% by 2040 (International Energy Agency 2019). Radiative cooling, a long-discovered passive cooling mechanism, is one of the key technologies that can provide sustainable solutions to this global problem. Two mechanisms responsible for radiative cooling phenomena are reflection of incident solar irradiation and emission of thermal radiation in the infrared region. A surface’s temperature decreases as long as heat loss by thermal radiation exceeds heat received from absorbed sunlight and other sources. Therefore, structures with high solar reflectance and high infrared emissivity are preferred for implementing radiative cooling technology.
Development and experimental performance characteristics of composite coated daytime radiative water cooler
Published in Science and Technology for the Built Environment, 2023
J. P. Bijarniya, Jahar Sarkar, Shivam Tiwari, P. Maiti
Daytime radiative cooling is an emerging technology currently in research and development with various prospective applications. It is a spontaneous thermodynamic process of simultaneous solar radiation reflection and thermal emission in the mid-infrared radiation spectrum, especially in the atmospheric window (8–13 µm) by a tailored surface. Because its natural driving force is purely dependent on surface coating (emissivity) technology, it attracts alternating and renewable energy-based research communities’ interests. This technology is also challenging because its potential is limited and researchers in this field must identify the most suitable applications (Bijarniya, Sarkar, and Maiti 2020a). This technology could possibly retard the impact of global warming because of its renewable nature and forcing heat from a surface to outer space. Whereas conventional cooling appliances alone have 15–20% primary energy shares and these devices, after local cooling, ultimately produce heat that lefts surrounding heated (Raman et al. 2014). Radiative cooling could reduce this cooling load through the proper utilization and integration with existing cooling technologies like vapor compression refrigeration system-based air conditioners. The use of a radiative cooler on the roof reduces the solar radiation heat gain and hence net heat gain by air-conditioned space, thus reducing the cooling load (Chakroun et al. 2022).
Toward energy-efficient buildings in Oman
Published in International Journal of Sustainable Energy, 2020
Evaporative cooling is a process of absorbing heat from the air which will evaporate water. This can be done by using fountains, sprays, pools, ponds and vegetation. In ground cooling, the heat is dissipated from buildings to ground, which is at a lower temperature compared with the ambient. The dissipation of heat can be attained either through the direct connection of the building envelop with the ground or via earth-to-air heat exchangers by injecting the circulated air into the building (Geetha and Velraj 2012). Radiative cooling is based on losing heat by radiative emission from one body toward another one at lower temperature. In which the building radiates toward to sky and gets cooler. Painting the roof with white colour represents the simplest radiative cooling technique, as a result the roof will absorb less radiation and thus can easily cooled by radiation at night (Geetha and Velraj 2012). Additionally, PCM can be used to store ‘coolness’ of air-condition in the nighttime which can be used to cool the building during the hot hours of the day (Geetha and Velraj 2012).