Cascaded liquid desiccant system for humidity control in space conditioned by cooled membrane ceiling and displacement ventilation

Charara, Jamal; Ghaddar, Nesreen; Ghali, Kamel; Zoughaib, Assaad; Simonetti, Marco

doi:10.1016/j.enconman.2019.05.102

Cited by 17 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Radiant cooling systems combined with displacement ventilation systems contribute significantly to energy savings and thermal environment maintenance [1,2], and as a result, they have been applied in some large space buildings [3,4]. The combined system stratifies indoor air in the vertical direction, thus maintaining the comfort level of persons located in areas up to 2 m above the ground, and reducing the cooling load caused by the heat gain in the upper part of a large space [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal Environment Analysis and Optimization for Large Space Buildings with Radiant Cooling Floors: A Case Study of Xianyang International Airport

Hu,

Wang,

Liang

et al. 2024

Buildings

View full text Add to dashboard Cite

Radiant cooling floors combined with ventilation systems have been widely applied in large space buildings. However, there has been a lack of research on system control strategies for their adaptation to weather changes. This study aimed to find control strategies for radiant cooling floors combined with displacement ventilation systems used in large space buildings in order to achieve energy conservation and environmental improvement. Supply air temperature and cooling surface temperature were determined to be the control variables. It was found that cooling capacity of the combined system and the comfort index, PMV (predicted mean vote), were linear in relation to the supply air temperature and cooling surface temperature. The linear equations regarding cooling capacity and PMV were established separately using environment data, and then the optimal region was determined. A case study on Terminal 3 of Xi’an Xianyang International Airport was conducted. The thermal environment was investigated through on-site measurements, questionnaires, and numerical simulations with CFD (computational fluid dynamics). It was found that supply air temperature and cooling surface temperature had a significant impact on PMV, and less impact on the cooling capacity. Therefore, it was determined that the supply air temperature should be altered first when the indoor temperature exceeds the upper limit, and then the cooling surface temperature should be changed if the indoor environment continues to overheat with the supply air temperature set to 18 °C. Thus, the supply air temperature was kept at 18 °C, and the floor surface temperature was set to be 22 °C on a high-temperature day. The average PMV was 0.87, and the cooling capacity of the combined system was 200 W/(m2·K), according to the CFD simulation. In addition, the surface heat transfer coefficient of the cooling floor was found to be 10.26 W/(m2·K). This research provides important references for the design and operational management of radiant cooling floors in large space buildings.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In addition, taking the operative temperature as the reference temperature and using the form of Newton's cooling formula, the mathematical expression of the heat transfer of the floor surface is shown by Equation (2). The calculation formula for operative temperature is shown by Equation (10).…”

mentioning

confidence: 99%