A two-step approach to solve the issue of dew condensation for displacement ventilation and chilled ceiling system

Tian, Yuchen; Guo, Shu-Guang; Jin, Guang; Pang, Yunji; Wang, Xiaotong; Wu, Wenfei; Zhao, Jun

doi:10.1016/j.egypro.2019.01.106

Cited by 3 publications

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“…al., 2017) presented numerical study for flow and temperature fields in a room with a combined system (CC/DV); the results showed the position of the radiant cooling surface at the upper zone of the room was given better thermal comfort. (Tian. et al 2019) studied numerically the variation of temperature, humidity and condensation phenomena on the chilled ceiling in the office room with DV system, and the results found that dew condensation on the chilled ceiling could be alleviated by running the DV system for 300s before running chilled ceiling.…”

Section: Introductionmentioning

confidence: 99%

Assessment age of air and thermal comfort in a classroom by adopting displacement ventilation with chilled ceiling system

Shbeeb

Mahdi

Hussein

2021

JER is an international, peer-reviewed journal that publishes f

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This study aims to investigate the effect of the cooling load ratio covered by the chilled ceiling on the age of air and comfort level in a classroom in a hot and dry climate in Iraq-Hilla city. Air age, air exchange efficiency, and concentrations of pollutants in a classroom are investigated numerically by used AIRPAK software under displacement ventilation combined with a chilled ceiling system. Four cases are studied at different values of the cooling load covered by the chilled ceiling (0%, 25%, 50%, 80%) with respect to total classroom cooling load. Cooling load removes by chilled ceiling varied from (0 to 84.5 W/m2) based on the classroom area, and its temperature varied between (17.5-22.5oC). The displacement ventilation airflow rate was kept at 0.3m3/s, and the air temperature supply varied between (19.5-24.5oC) depend on the amount of cooling load covered by displacement ventilation. The results showed that the mean local air age increasing with height. The room mean air age increase and air exchange efficiency reduce with increasing load portion, which treated by the chilled ceiling. Increasing the portion of the load treated by chilled ceiling tends to improve comfort levels.

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Section: Introductionmentioning

confidence: 99%

Assessment age of air and thermal comfort in a classroom by adopting displacement ventilation with chilled ceiling system

Shbeeb

Mahdi

Hussein

2021

JER is an international, peer-reviewed journal that publishes f

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The Temperature Control Methods for the Heat Supply System of Buildings and Structures

Tyutyunov

Pihtin

Borodin

2022

Lecture Notes in Civil Engineering

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Effects of supply Diffuser Shape on Air Age and Human Comfort in an Office with Displacement Ventilation and Chilled Ceiling System in Hot and Dry climate

Shbeeb

Mahdi

Hussein

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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In recent years, the need to provide a clean environment in enclosed places has drawn increasing levels of attention due to the spread of epidemics and viruses across the world. Chilled ceilings with displacement ventilation represent promising technology. The combined ventilation system has not yet been used in Iraqi buildings, then it’s a good starting point for study the performance of this system in Iraq-Hilla city climate (hot and dry climate). An office room with a combined ventilation system was simulated using AIRPAK software. Indoor air age, air temperature distribution, CO2 concentration and thermal efficiency were estimated numerically. During the simulation process, the effects of two different supply diffuser shapes (one way rectangular diffuser and semicircle diffuser) were compared to investigated the effect of supply diffuser shape on air age and thermal environment in hot and dry climate (passed on peak summer temperatures in Hilla city). Three tests were performed for each case based on changing the load treated by the chilled ceiling as (25%, 50% and 80%) respect to total cooling load and represented (26, 53, 85W/m2) respectively based on floor area. The temperature of chilled ceiling surface varied as (21.5, 19 and 16°C) and the air supply temperature similarly varied (19, 22, and 24.5 °C) respectively at constant air flowrate of (0.045m3/s). The results of the tests found that the effect of diffuser shape on the local age of air decreased with height, the maximum difference between two cases at the 0.1m level was about 49s while at 2.25m level it was only about 11s. The air exchange efficiency for the CC/DV system using a semicircle diffuser in the predetermined office space was higher by an average of 8.5% as compared with a similar system using a rectangular diffuser; this differential reduced about 3% at each increase in portion of cooling load treated by the chilled ceiling, however.

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A two-step approach to solve the issue of dew condensation for displacement ventilation and chilled ceiling system

Cited by 3 publications

References 0 publications

Assessment age of air and thermal comfort in a classroom by adopting displacement ventilation with chilled ceiling system

Assessment age of air and thermal comfort in a classroom by adopting displacement ventilation with chilled ceiling system

The Temperature Control Methods for the Heat Supply System of Buildings and Structures

Effects of supply Diffuser Shape on Air Age and Human Comfort in an Office with Displacement Ventilation and Chilled Ceiling System in Hot and Dry climate

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