A Study on Passive Cooling Methods by Evaporation and Solar Reflection on Rooftops in a Temperate Climate Region

The importance of building energy performance has been substantially increasing in the last decades due to the global warming. Therefore, buildings within the existing stock and the new buildings are encouraged to achieve the energy performance restrictions and efficiency levels. In this context, a social housing archetype (Harct), which is constructed in each climate region of Turkey with a common design approach for temperate climate region, is evaluated as a base case to improve the energy performance for the cold climate region by the optimization of the life cycle cost (LCC). It is, namely, aimed to not only improve the energy performance of the archetype but also to ensure optimal cost efficiency as significant criterion. It is focused to optimize the façades of the Harct in terms of window width, and optic and thermo-physical properties of the façade with determining the efficient insulation thickness level for exterior walls and efficient glazing types for windows. Firstly, façade design is analysed to find out the minimum and maximum windows’ widths to achieve the optimal window sizes. Secondly, optic and thermo-physical properties and cost data of the opaque and transparent façade elements have been designated among the market products in accordance with the current regulations. Energy model of the building has been run by Energy Plus simulation tool, in order to integrate it with GenOpt for optimization. Optimization was performed to carry out efficient frontier cases. The results were evaluated from life cycle cost (LCC) and energy efficiency point of view to highlight the cost optimal point

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Building and Urban Cooling Performance Indexes of Wetted and Green Roofs—A Case Study under Current and Future Climates

Energies ◽

10.3390/en13236192 ◽

2020 ◽

Vol 13 (23) ◽

pp. 6192

Author(s):

Madi Kaboré ◽

Emmanuel Bozonnet ◽

Patrick Salagnac

Keyword(s):

Thermal Comfort ◽

Emission Scenario ◽

Green Roof ◽

Heat Fluxes ◽

Temperate Climate ◽

Passive Cooling ◽

Thermal Discomfort ◽

Indoor Thermal Comfort ◽

Performance Indexes ◽

The Impact

We developed and studied key performance indexes and representations of energy simulation heat fluxes to evaluate the performance of the evaporative cooling process as a passive cooling technique for a commercial building typology. These performance indexes, related to indoor thermal comfort, energy consumption and their interactions with their surrounding environments, contribute to understanding the interactions between the urban climate and building for passive cooling integration. We compare the performance indexes for current and future climates (2080), according to the highest emission scenario A2 of the Special Report on Emission Scenario (SRES). Specific building models were adapted with both green roof and wetted roof techniques. The results show that summer thermal discomfort will increase due to climate change and could become as problematic as winter thermal discomfort in a temperate climate. Thanks to evapotranspiration phenomena, the sensible heat contribution of the building to the urban heat island (UHI) is reduced for both current and future climates with a green roof. The performance of the vegetative roof is related to the water content of the substrate. For wetted roofs, the impacts on heat transferred to the surrounding environment are higher for a Mediterranean climate (Marseille), which is warmer and drier than the Paris climate studied (current and future climates). The impact on indoor thermal comfort depends on building insulation, as demonstrated by parametric studies, with higher effects for wetted roofs.

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A Review on Passive Cooling Methods for Green Energy Buildings

Springer Proceedings in Materials - Advances in Materials Research ◽

10.1007/978-981-15-8319-3_55 ◽

2021 ◽

pp. 555-563

Author(s):

Muthusamy Ponmurugan ◽

M. Ravikumar ◽

Athimoolam Sundaramahalingam

Keyword(s):

Green Energy ◽

Passive Cooling ◽

Cooling Methods

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Evaluation of passive cooling methods to improve microclimate for natural ventilation of a house during summer

Building and Environment ◽

10.1016/j.buildenv.2018.12.027 ◽

2019 ◽

Vol 149 ◽

pp. 275-287 ◽

Cited By ~ 5

Author(s):

Maria Alejandra Del Rio ◽

Takashi Asawa ◽

Yukari Hirayama ◽

Rihito Sato ◽

Isamu Ohta

Keyword(s):

Natural Ventilation ◽

Passive Cooling ◽

Cooling Methods

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Review of Passive Cooling Methods for Buildings

Journal of Physics Conference Series ◽

10.1088/1742-6596/1473/1/012054 ◽

2020 ◽

Vol 1473 ◽

pp. 012054

Author(s):

Vaddin Chetan ◽

Kori Nagaraj ◽

Prakash S Kulkarni ◽

Shiva Kumar Modi ◽

U N Kempaiah

Keyword(s):

Passive Cooling ◽

Cooling Methods

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Cooling Methods for Railway Tunnels

Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit ◽

10.1243/pime_proc_1995_209_262_02 ◽

1995 ◽

Vol 209 (2) ◽

pp. 105-112 ◽

Cited By ~ 3

Author(s):

H Barrow ◽

C W Pope

Keyword(s):

Energy Dissipation ◽

Cost Effective ◽

Point Of View ◽

Passive Cooling ◽

Railway Tunnel ◽

Cooling Systems ◽

First Law Of Thermodynamics ◽

Air Temperatures ◽

Cooling Methods

In this paper the cooling of a railway tunnel and its environment is investigated, with particular reference to a study of possible methods for reducing both local and overall average tunnel air temperatures. Both passive and supplementary cooling of a tunnel are considered and then various practical systems are proposed for those situations where passive cooling alone may be inadequate. In some cases, calculations for realistic conditions are made using the First Law of Thermodynamics to assess the efficacy of the system from the thermal point of view. It is concluded that with the advent of increasing energy dissipation, as a consequence of increase in tunnel usage, thermally efficient and cost-effective cooling systems must be developed if temperatures are to be maintained at acceptable levels.

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Thermal Management System Using Phase Change Material for Lithium-ion Battery

Journal of Physics Conference Series ◽

10.1088/1742-6596/2117/1/012005 ◽

2021 ◽

Vol 2117 (1) ◽

pp. 012005

Author(s):

E Grimonia ◽

M R C Andhika ◽

M F N Aulady ◽

R V C Rubi ◽

N L Hamidah

Keyword(s):

Phase Change ◽

Lithium Ion Battery ◽

Thermal Management ◽

Cooling System ◽

Lithium Ion ◽

Passive Cooling ◽

Thermal Management System ◽

Passive Cooling System ◽

Change Material ◽

Cooling Methods

Abstract The lithium-ion battery is promising energy storage that provides proper stability, no memory effect, low self-discharge rate, and high energy density. During its usage, batteries generate heat caused by energy loss due to the transition of chemical energy to electricity and the electron transfer cycle. Consequently, a thermal management system by cooling methods in the battery is needed to control heat. One of the cooling methods is a passive cooling system using a phase change material (PCM). PCM can accommodate a large amount of heat through small dimensions. It is easy to apply and requires no power in the cooling system. This study aims to find the best type of PCM criteria for a Lithium-ion battery cooling system. The research was conducted by simulations using computational fluid dynamics. The variations were using PCM Capric Acid and PCM Hexacosane, with thickness variations of 3 mm, 6 mm, and 9 mm. Hexacosane PCM with 9 mm thickness indicates the best result to reduce heat up to 6.54°K, demonstrating a suitable passive cooling system for Li-ion batteries.

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