Reduced-scale experiments of heat transfer from integrated radiant ceiling panel and diffuse ceiling ventilation

Krusaa, Marie Rugholm; Hviid, Christian Anker

doi:10.1016/j.applthermaleng.2021.117348

Cited by 10 publications

(2 citation statements)

References 39 publications

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“…Three types of DCV panels are discussed in literature and these differ on specifications of pressure drop across the false ceiling and consequently the airflow characteristics in the ventilated room, see [3,24]. Experimental and numerical studies have explored DCV [32][33][34][35], while other studies have explored integration of other building technologies and strategies to enhance building ventilation performance [36][37][38][39]. Overall, DCV has several benefits over conventional duct-based ventilation.…”

Section: Introductionmentioning

confidence: 99%

On the Performance of Diffuse Ceiling Ventilation in Classrooms: A Pre-Occupancy Study at a School in Southern Sweden

Ogbuagu

Linden

MacCutcheon³

et al. 2023

Sustainability

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The implementation and application of diffused ceiling ventilation (DCV) is gradually gaining momentum, especially in Denmark, Finland, and the Netherlands. In countries such as Sweden, the application is limited despite the favorable conditions for implementation. The current study investigates the performance of DCV and mixing ventilation in a pre-occupancy field study for newly renovated classrooms in Southern Sweden. Two classrooms at the school were installed with diffuse ceiling ventilation while the rest had mixing ventilation. The objective of the study was to compare and evaluate the ventilation performance in terms of indoor environmental quality parameters such as thermal comfort, air quality indexes, airflow, and temperature distribution. Pre-occupancy measurements were performed in two classrooms with similar room characteristics, with one room running under mixing ventilation and the other under DCV. Constant temperature anemometers, thermocouples, and INNOVA thermal comfort were used to measure the indoor air speeds, temperature, and thermal comfort, respectively. Tracer gas measurements, with SF6, were performed to assess air quality. Additionally acoustic measurements were conducted to assess the acoustic benefits of DCV on reducing ventilation noise. The results demonstrate that DCV offers similar indoor environmental conditions to mixing ventilation but has better acoustic performance especially on reducing the ventilation noise. Indoor environmental conditions were very homogeneous under DCV with mixing ventilation showing tendencies for short circuit ventilation. This study demonstrates that DCV has a potential for implementation in Swedish schools with minimal system modification on existing ventilation and air distribution systems.

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Section: Introductionmentioning

confidence: 99%

On the Performance of Diffuse Ceiling Ventilation in Classrooms: A Pre-Occupancy Study at a School in Southern Sweden

Ogbuagu

Linden

MacCutcheon³

et al. 2023

Sustainability

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“…The authors have introduced an integrated concept with suspended radiant ceiling panels and diffuse ceiling ventilation under the name 'HVACeiling' [9][10][11]. Diffuse ceiling ventilation uses the perforated or porous suspended ceiling as the supply inlet to the room.…”

Section: Introduction 1motivationmentioning

confidence: 99%

Numerical Feasibility Study of Self-Regulating Radiant Ceiling in Combination with Diffuse Ceiling Ventilation

Krusaa

Hviid

2022

Energies

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A focus on indoor comfort and tightening targets for energy savings in buildings presents new opportunities for heating, ventilation, and air-conditioning products (HVAC). This paper presents a novel comfort solution that integrates a suspended radiant ceiling with diffuse ventilation, dubbed HVACeiling. In combination with the concrete slab, the HVACeiling has the potential to provide thermal comfort with minimal temperature offset, which supports operation of the heating and cooling system at temperatures very close to the room comfort temperature. The paper presents a parametric numerical study of the concept in a simplified two-pipe layout with fixed flow and fixed temperatures. First, the analysis was focused on different internal and solar loads, heat losses, and climatic locations with the aim of assessing the potential of self-regulation, i.e., no active controls, thermal comfort, ability to reduce peak loads and the consequential building design considerations. Secondly, the purpose was to analyse the concept in a generic office building with five offices and one meeting room and compare it to other HVAC solutions. The whole-year analyses of heating, cooling, energy performance, and thermal comfort were done using the building performance simulation software IDA ICE. It was found that it was possible to create thermal comfort in Paris, Munich, and Copenhagen with water circulating constantly with fixed temperatures of 20–24 °C without controls and with window sizes from 15 to 30% of the floor area. The studies showed that the HVACeiling reduced the operative peak temperatures on the warmest days in comparison with a standard radiant ceiling with mixing ventilation by 1 K. Compared to all-air solutions, the HVACeiling reduced the yearly energy consumption by 20–30% and the peak power in summer up to 69%. This study indicates that thermal comfort is achievable in a European context even at very small temperature offsets, which supports the use of more renewable energy sources.

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Scale modeling study of airflow distribution uniformity in large spaces with high heat flux

Zhi

et al. 2022

Applied Thermal Engineering

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Reduced-scale experiments of heat transfer from integrated radiant ceiling panel and diffuse ceiling ventilation

Cited by 10 publications

References 39 publications

On the Performance of Diffuse Ceiling Ventilation in Classrooms: A Pre-Occupancy Study at a School in Southern Sweden

On the Performance of Diffuse Ceiling Ventilation in Classrooms: A Pre-Occupancy Study at a School in Southern Sweden

Numerical Feasibility Study of Self-Regulating Radiant Ceiling in Combination with Diffuse Ceiling Ventilation

Scale modeling study of airflow distribution uniformity in large spaces with high heat flux

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