Thermal environment in a simulated double office room with convective and radiant cooling systems

Mustakallio, Panu; Bolashikov, Zhecho Dimitrov; Rezgals, Lauris; Lipczyńska, Aleksandra; Melikov, Arsen Krikor; Kosonen, Risto

doi:10.1016/j.buildenv.2017.06.029

Cited by 23 publications

(24 citation statements)

References 10 publications

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“…Mainly due to this increasing interest and increasing use, several recent studies compared the thermal indoor environment created by radiant and convective systems by climate chamber studies [3], [4], [5] and by field studies [6], [7]. A recent literature review [8] focused on the thermal comfort resulting from radiant and all-air systems and concluded that there was a need for further studies to be able to provide a definitive conclusion on which system provides a more satisfactory thermal indoor environment.…”

Section: Introductionmentioning

confidence: 99%

Human response to the thermal indoor environment created by a radiant, and a combined radiant and convective cooling system

Kazanci¹,

Khovalyg

Iida

et al. 2019

E3S Web Conf.

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This study reports the main findings from a series of human subject experiments, where the subjects were exposed to the different indoor environments created by different cooling systems. The studied systems were a radiant cooling system (chilled ceiling and mixing ventilation, CCMV), and a combined radiant and convective cooling system (radiant diffuse ceiling ventilation, RDCV). The experiments were conducted in a climate chamber under controlled conditions. The climate chamber was configured as a two-person office room. 24 human subjects (12 female and 12 male) were chosen. The exposure lasted three hours and the participants were allowed to work on their own tasks (normal office work) during the exposure. The cooling load was 54 W/m2 and the room temperature at a reference location was kept constant at 26°C (summer conditions). The results show that under both systems, whole body thermal sensation was between slightly warm and neutral (closer to neutral with the RDCV system), and the overall thermal acceptability was almost the same for both systems (close to clearly acceptable). The satisfaction of the human subjects with the thermal environment was very close under the two systems; between satisfactory and slightly satisfactory (closer to satisfactory). Air movement acceptability (slightly higher and closer to clearly acceptable with the RDCV system) was also very close with the two systems. The results of the human subject experiments agree well with the physical measurements of the thermal indoor environment and confirm that the studied systems created very similar thermal indoor environments.

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Section: Introductionmentioning

confidence: 99%

Human response to the thermal indoor environment created by a radiant, and a combined radiant and convective cooling system

Kazanci¹,

Khovalyg

Iida

et al. 2019

E3S Web Conf.

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“…The set temperatures of the target zone (i.e. Zone D) in the low-load and high-load cases were 26°C 47 and 29°C, 57,58 respectively. By comparing the low-load and high-load cases, the influence of the intensity of heat sources on the space cooling load oriented to local thermal requirements was analysed; by comparing Cases L-1 to L-9, the influence of the location of heat sources was analysed; by comparing Cases H-1 and H-2, the influence of the shape of heat sources was analysed and by comparing Cases H-2, H-3 and H-4, the difference between the localized and distributed heat sources was analysed.…”

Section: Methodsmentioning

confidence: 99%

“…Actually, the heat source distributions in buildings are diverse and changeable (e.g. lights on/off, occupant movement, sunlight changes with time and climate), 46,47 and they could have different heat gain levels. 48,49 Therefore, the aim of this study is to further analyse the influence of different heat source distributions on the space cooling load oriented to local thermal requirements by using the experimental method.…”

Section: Introductionmentioning

confidence: 99%

The influence of heat source distribution on the space cooling load oriented to local thermal requirements

Liang

Melikov

2019

Indoor and Built Environment

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Existing studies have shown that the space cooling load oriented to local thermal requirements is significantly influenced by different heat source distributions. However, numerical methods have been mainly used in the analysis based on a fixed airflow field and ignoring the thermal plume. Here, an experiment in a chamber with mixing ventilation was conducted. The heat sources were simulated by metal barrels and an oil-filled radiator, 13 types of heat source distributions were designed and the local cooling load (LCL) was used as the evaluation index. The results show that (1) the LCL is equal to the total amount of heat sources at the steady state in a room with mixing ventilation only if the heat sources are also distributed uniformly; (2) the LCL decreases with a decrease in the intensity of heat sources, achieving a decrease rate of 47.4%–70.8% in the experiment with different intensities; (3) the LCL is 9.2%–22.3% lower than the total amount of heat sources when these are located near the exhaust diffuser or far away from the target zone; (4) owing to its smaller surface area, the LCL with an oil-filled radiator is 7% lower than that with five metal barrels.

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“…No entanto, ainda há carência de estudos de campo, especialmente envolvendo a percepção térmica de usuários (MUSTAKALLIO et al, 2017). Os estudos sobre resfriamento radiante e resfriamento evaporativo ainda enfocam principalmente a otimização e o desempenho dos sistemas (SHARIFI; YAMAGATA, 2015).…”

Section: Introductionunclassified

Percepção térmica em um ambiente com painéis radiantes acoplados a um teto-reservatório

2021

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Resumo Tetos-reservatório (TR) podem colaborar para obtenção de condições térmicas confortáveis, particularmente em edificações térreas. Possibilitam resfriamento ou aquecimento estrutural e estabilização das temperaturas superficiais e do ar. Uma alternativa para melhorar o desempenho do TR é acoplá-lo a painéis radiantes. Atualmente, há escassez de pesquisas enfocando a percepção térmica de usuários em ambientes fechados condicionados por TR. O objetivo desta pesquisa foi verificar, empiricamente, para condições de verão, a percepção térmica de voluntários em um ambiente condicionado por painéis radiantes acoplados a TR. Buscou-se também identificar qual modelo adaptativo melhor representaria os votos declarados pelos participantes do estudo. Como parâmetros para análise das percepções térmicas reportadas, adotaram-se o modelo PMV e os modelos para edificações passivas das normas Standard 55 e EN 15251. O experimento ocorreu em uma edificação-teste da Ben-Gurion University of Negev, em Israel. Foram consideradas respostas de 46 voluntários. O ambiente dotado de TR foi percebido como confortável pela maior parte dos voluntários. As respostas subjetivas apresentaram maior concordância com os modelos PMV e da EN 15251 do que com o modelo da ASHRAE.

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Thermal environment in a simulated double office room with convective and radiant cooling systems

Cited by 23 publications

References 10 publications

Human response to the thermal indoor environment created by a radiant, and a combined radiant and convective cooling system

Human response to the thermal indoor environment created by a radiant, and a combined radiant and convective cooling system

The influence of heat source distribution on the space cooling load oriented to local thermal requirements

Percepção térmica em um ambiente com painéis radiantes acoplados a um teto-reservatório

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