A Review on Passive Cooling Methods for Green Energy Buildings

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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Dry Cooling in Solar Thermal Power Plants

ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C ◽

10.1115/es2011-54396 ◽

2011 ◽

Cited By ~ 1

Author(s):

Jaya Goswami

Keyword(s):

Power Plant ◽

Power Plants ◽

Large Scale ◽

Thermal Power ◽

Solar Thermal ◽

Passive Cooling ◽

Thermal Power Plants ◽

Solar Thermal Power ◽

Cooling Methods ◽

Dry Cooling

The purpose of this study is to evaluate the performance metrics of a solar thermal power plant with dry cooling and further implement a method to increase the cycle efficiency, using passive cooling techniques within the dry cooling cycle. Current methods implementing dry cooled condensation use an air-cooled condenser for heat rejection. While this reduces the water consumption of the plant, it results in performance penalties in the overall plant between 5–10% [1]. Passive cooling methods can be used to alleviate the performance penalties. While passive cooling methods have been studied and used on a small scale, this model explores the possibilities of applying these methods to large-scale solar thermal power plants. Based on the model developed, it was found that underground-cooling techniques can improve the performance of the overall dry cooled solar thermal power plant by up to 3% at peak dry bulb temperatures. This study finds that there is a possibility to apply these passive cooling techniques on a large scale to yield positive results.

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Passive cooling for thermal comfort in informal housing

Journal of Energy in Southern Africa ◽

10.17159/2413-3051/2020/v31i1a7689 ◽

2020 ◽

Vol 31 (1) ◽

pp. 28-39

Author(s):

David Kimemia ◽

Ashley Van Niekerk ◽

Harold Annegarn ◽

Mohamed Seedat

Keyword(s):

Thermal Comfort ◽

Low Cost ◽

Heat Stroke ◽

Informal Settlements ◽

Green Energy ◽

Maximum Temperature ◽

Passive Cooling ◽

Daily Maximum ◽

Poor Households ◽

Urban Informal Settlements

Energy-poor households in Africa’s burgeoning urban informal settlements are especially likely to suffer from heatwaves because of thermally inefficient dwellings and lack of affordable cooling options. This study utilised a controlled experiment to assess the effectiveness of passive cooling through specially formulated paints (cool coatings) in standard informal structures. The test structures were built to simulate typical shack dwellings in South Africa’s urban informal settlements. Results showed that the mean daily maximum temperatures of the coated structure were up to 4.3 °C lower than those in the uncoated structure. The same cooling trend was observed for the minimum daily temperatures, which were lower by an average of 2.2 °C. Besides, the annual frequency of maximum temperature exceedances beyond the critical heat stroke value of 40 °C dropped from 19% for the uncoated structure to 1% for the coated structure. These temperature differences were found to be statistically and subjectively significant, implying that cool coatings may be effective in promoting thermal comfort and climate resilience in poor urban communities. It is recommended that governmental authorities and relevant role players invest in the production and assisted application of cool coatings in urban informal settlements. The interventions promise hope of reduced energy burden on poor households and could be implemented in parallel with ongoing efforts focused on the design and implementation of low-cost, durable and thermally comfortable houses for indigent communities. Ultimately, the endeavours could be a potential policy change to assist in expanding poor households’ access to alternative and green energy resources.

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Climatic Maps for Passive Cooling Methods Utilization in Thailand

Journal of Asian Architecture and Building Engineering ◽

10.3130/jaabe.3.109 ◽

2004 ◽

Vol 3 (1) ◽

pp. 109-114 ◽

Cited By ~ 3

Author(s):

Athasit Jittawikul ◽

Ikuo Saito ◽

Osamu Ishihara

Keyword(s):

Passive Cooling ◽

Cooling Methods

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