International Journal of Low-Carbon Technologies, 2020
In this paper, oblique impact of a single rain droplet on super-hydrophobic surface with randomly... more In this paper, oblique impact of a single rain droplet on super-hydrophobic surface with randomly distributed rough structures was investigated by lattice Boltzmann method. The effects of the impact angle of the droplet as well as the skewness and kurtosis of rough surface on the bouncing ability of the droplet were in this paper. It was found that the oblique impact can effectively reduce the contact time in the process of droplet bouncing off, because the energy consumption caused by the pinning effect is reduced. Moreover, the contact time most possibly reaches the shortest when the impact angle is 45°. Decreasing the skewness and keeping the kurtosis around 4.0 can enhance the bouncing ability during the droplet oblique impact on randomly distributed rough surfaces. The results are useful for the design of building structures.
Modern refrigeration technology including absorption refrigeration has coexisted with the more st... more Modern refrigeration technology including absorption refrigeration has coexisted with the more standard type of vapour compression systems ever since the beginning of refrigeration. Absorption refrigeration mainly requires a heat source to drive its cooling cycle. Only in the USA and Japan is absorption refrigeration widespread in the market, a market tendency of the last decades. Concerns regarding the Global Warming Potential and the more recently defined Thermal Equivalent Warming Impact (TEWI) is an opportunity to further explore the applications of absorption refrigeration. TEWI considers both the direct refrigerant effect and the primary energy impact on the equivalent carbon dioxide (CO2) emissions. This paper explores these applications over a range of annual operating times, and therefore makes recommendations on absorption system diversification to reduce the TEWI.
Indoor Environmental Quality (IEQ) is essential for the health and productivity of building users... more Indoor Environmental Quality (IEQ) is essential for the health and productivity of building users. The risk of overheating in buildings is increasing due to increased density of occupancy of people and heat emitting equipment, increase in ambient temperature due to manifestation of climate change or changes in urban micro-climate. One of the solutions to building overheating is to inject some exposed thermal mass into the interior of the building. There are many different types of thermal storage materials which typically includes sensible heat storage materials such as concrete, bricks, rocks etc. It is very difficult to increase the thermal mass of existing buildings using these sensible heat storage materials. Alternative to these, there are latent heat storage materials called Phase Change Materials (PCM), which have high thermal storage capacity per unit volume of materials making them easy to implement within retrofit project. The use of Passive Cooling Thermal Energy Storage ...
International Journal of Low-Carbon Technologies, 2020
In this paper, oblique impact of a single rain droplet on super-hydrophobic surface with randomly... more In this paper, oblique impact of a single rain droplet on super-hydrophobic surface with randomly distributed rough structures was investigated by lattice Boltzmann method. The effects of the impact angle of the droplet as well as the skewness and kurtosis of rough surface on the bouncing ability of the droplet were in this paper. It was found that the oblique impact can effectively reduce the contact time in the process of droplet bouncing off, because the energy consumption caused by the pinning effect is reduced. Moreover, the contact time most possibly reaches the shortest when the impact angle is 45°. Decreasing the skewness and keeping the kurtosis around 4.0 can enhance the bouncing ability during the droplet oblique impact on randomly distributed rough surfaces. The results are useful for the design of building structures.
Modern refrigeration technology including absorption refrigeration has coexisted with the more st... more Modern refrigeration technology including absorption refrigeration has coexisted with the more standard type of vapour compression systems ever since the beginning of refrigeration. Absorption refrigeration mainly requires a heat source to drive its cooling cycle. Only in the USA and Japan is absorption refrigeration widespread in the market, a market tendency of the last decades. Concerns regarding the Global Warming Potential and the more recently defined Thermal Equivalent Warming Impact (TEWI) is an opportunity to further explore the applications of absorption refrigeration. TEWI considers both the direct refrigerant effect and the primary energy impact on the equivalent carbon dioxide (CO2) emissions. This paper explores these applications over a range of annual operating times, and therefore makes recommendations on absorption system diversification to reduce the TEWI.
Indoor Environmental Quality (IEQ) is essential for the health and productivity of building users... more Indoor Environmental Quality (IEQ) is essential for the health and productivity of building users. The risk of overheating in buildings is increasing due to increased density of occupancy of people and heat emitting equipment, increase in ambient temperature due to manifestation of climate change or changes in urban micro-climate. One of the solutions to building overheating is to inject some exposed thermal mass into the interior of the building. There are many different types of thermal storage materials which typically includes sensible heat storage materials such as concrete, bricks, rocks etc. It is very difficult to increase the thermal mass of existing buildings using these sensible heat storage materials. Alternative to these, there are latent heat storage materials called Phase Change Materials (PCM), which have high thermal storage capacity per unit volume of materials making them easy to implement within retrofit project. The use of Passive Cooling Thermal Energy Storage ...
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