Thermal performances study on a façade-built-in two-phase thermosyphon loop for passive thermo-activated building system

Zhu, Li; Yang, Yang; Chen, Sarula; Sun, Yong

doi:10.1016/j.enconman.2019.112059

Cited by 25 publications

(5 citation statements)

References 50 publications

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“…The condenser was validated from an experimental study by [7], who conducted experiments on a prototype to explore the operational characteristics of a two-phase thermosyphon loop (TPTL) for heating a building. To measure the temperature and pressure of the TPTL, four four-way connectors coupled to four Pt100 sensors were used.…”

Section: Resultsmentioning

confidence: 99%

Modelling of a Two-Phase Thermosyphon Loop for Passive Air-Conditioning of a House in Hot and Dry Climate Countries

Diallo¹,

Chesneau²,

Diaby³

et al. 2021

EPE

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The two-phase thermosyphon loop is an efficient solution for space cooling. This paper presents the simulation results of numerical studies on the heat transfer and thermal performance of a two-phase thermosiphon loop for passive air-conditioning of a house. The fluid considered in this study is methanol, which is compatible with copper and is environmentally friendly. These numerical results show that the temperature at the evaporator wall drops from 23˚C to 13˚C and increases at the condenser. The solar flux density has a strong influence on the condenser temperature. The mass flow rates and masses at the evaporator and condenser increase with temperature. The variation of evaporating and condensing temperature affects the performance of the system. For a constant evaporating and condensing temperature of 2˚C and 29˚C, the COP is 0.77 and 0.84 respectively. With these results, the use of the two-phase thermosyphon loop in air conditioning is possible to obtain a thermal comfort of the occupants acceptable by the standards but with a large exchange surface of the evaporator.

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Section: Resultsmentioning

confidence: 99%

Modelling of a Two-Phase Thermosyphon Loop for Passive Air-Conditioning of a House in Hot and Dry Climate Countries

Diallo¹,

Chesneau²,

Diaby³

et al. 2021

EPE

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“…Nas superfícies internas, foram alocados 10 termopares, sendo 5 instalados no centro das paredes laterais, cobertura, piso e porta. Outros 5 foram instalados na superfície fria, sendo que um termopar foi colocado no centro e os outros em quatro pontos nos centros das linhas diagonais, ver Figura 6a (Zhu;Sun, 2019;Wei et al 2019). Além disso, 15 termopares monitoram a temperatura do ar ambiente, com a finalidade de se obter a temperatura média do ar interno e a sua distribuição, Figura 6c.…”

Section: Bancada De Testesunclassified

Viabilidade da aplicação de termossifão bifásico para resfriamento passivo de ambientes internos

Almeida,

Brandalise,

Fuso

et al. 2023

PARC Pesq. em Arquit. e Constr.

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Pesquisas evidenciam que está em curso um aquecimento global irreversível até o fim deste século. Tal elevação de temperaturas do planeta aumenta ainda mais a necessidade de resfriamento de ambientes internos em edifícios, onde deve se empregar tecnologias mais efetivas em termos de consumo de energia. Neste contexto, métodos de arrefecimentos passivos devem ser investigados. O presente trabalho tem como objetivo avaliar a viabilidade da aplicação de termossifões bifásicos como estratégia para resfriamento de ambientes internos. Para isso, por meio de um estudo experimental, foi utilizada uma célula-teste, integrada com uma serpentina de cobre que simulou a seção evaporadora de um termossifão. A temperatura da serpentina foi mantida prescrita e uniforme ao longo de seu comprimento por um banho de temperatura controlada. No geral, pôde-se observar que o dispositivo se mostrou capaz de extrair calor de forma passiva do ambiente, reduzindo significativamente a temperatura do ar interno. Grande parte do calor foi extraído na primeira hora e, em alguns casos, na primeira hora e meia de testes. Contudo, a transferência do calor interno foi deficiente em situações em que a diferença de temperaturas entre a serpentina e a célula foi igual ou inferior a 7°C. A distribuição da temperatura do ar interno mostrou ser similar para todos os ensaios realizados, sendo mais alta nos quadrantes superiores da célula. Além disso, velocidade de estabilização das temperaturas das superfícies internas reduziu quando a temperatura da serpentina de cobre aumentou.

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“…The authors found that the performance of the wall with TABS is affected by the weather, the indoor temperature, the solar absorptivity of the envelope, and the mass flow rate. Zhu et al, [34] proposed a two-phase thermosyphon loop (TPTL) incorporated into a thermally activated wall and test it under winter conditions. The authors carried out experimental tests using a test wall 1 m wide, 0.9 m, high, and 0.2 m thick with embedded tubes of 0.009 internal diameters, using ethanol as working fluid.…”

Section: Tabs Embedded In Building Wallsmentioning

confidence: 99%

A Review of Thermally Activated Building Systems (TABS) for Improving the Thermal Behavior of Buildings

Villar-Ramos¹,

Hernández-Pérez²,

Aguilar-Castro³

et al. 2022

Preprint

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In recent years, several alternatives for improving the thermal comfort conditions inside buildings have been proposed. Among these alternatives, Thermally Activated Building Systems (TABS) have become of interest due to the benefits this technology brings to the building sector. The TABS are embedded in different building components and exchange heat with building envelope to improve the indoor air temperature. This review presents relevant results presented in the literature on the thermal behavior of TABS, the different types of TABS configurations, and the main parameters of TABS studied such as pipe separation, fluid inlet temperature, fluid velocity, and volumetric flow rate. The potential of TABS to improve thermal comfort conditions and provide energy savings is also discussed. Further, this study presents the different modes of application.

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Thermal performances study on a façade-built-in two-phase thermosyphon loop for passive thermo-activated building system

Cited by 25 publications

References 50 publications

Modelling of a Two-Phase Thermosyphon Loop for Passive Air-Conditioning of a House in Hot and Dry Climate Countries

Modelling of a Two-Phase Thermosyphon Loop for Passive Air-Conditioning of a House in Hot and Dry Climate Countries

Viabilidade da aplicação de termossifão bifásico para resfriamento passivo de ambientes internos

A Review of Thermally Activated Building Systems (TABS) for Improving the Thermal Behavior of Buildings

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