A combined system of chilled ceiling, displacement ventilation and desiccant dehumidification

Hao, Xiaoli; Zhang, Guoqiang; Chen, Youming; Zou, Shenghua; Moschandreas, Demetrios J.

doi:10.1016/j.buildenv.2006.08.020

Cited by 130 publications

(56 citation statements)

References 13 publications

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“…In a field study for an office building with radiant slab cooling, it was demonstrated that the average vertical air temperature difference between the ankle and head was about 0.5 K, and the average draught rate was about 4%, which indicates that radiant slab cooling is effective in reducing local discomfort [25]. It was reported that a chilled ceiling system can achieve identical thermal comfort to that of the all-air system, with a room air temperature 2 K higher [27]. Measurements and questionnaires conducted in Dutch schools with TABS installed showed that the users are more satisfied during winter compared to traditional heating systems [35].…”

Section: Comfortmentioning

confidence: 97%

“…For this reason, the condensation control strategies should be implemented with the safety margin of 1e2 K. Song et al showed that the difference between the floor surface and dew-point temperature should be controlled to be always greater than or equal to 2 K considering the safety rate [117]. With regard to the chilled ceiling system, Hao et al claimed that the surface temperature of the chilled ceiling should be at least 1 K higher than the dew-point temperature of the indoor air in order to prevent the condensation on the chilled ceiling [27]. Fig.…”

Section: )mentioning

confidence: 99%

“…Corgnati et al showed that a chilled ceiling combined with mechanical ventilation can significantly decrease the draught risks by reducing the vertical drop of an air jet, which is often observed in all-air systems [26]. Hao et al claimed that a chilled ceiling with displacement ventilation could not result in draught risk, if the heat removal by the chilled ceiling is less than 100 W/m 2 [27]. Objective Fig.…”

Section: Comfortmentioning

confidence: 99%

See 2 more Smart Citations

Ten questions about radiant heating and cooling systems

Rhee

Olesen²,

Kim

2017

Building and Environment

239

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Section: Comfortmentioning

confidence: 97%

Section: )mentioning

confidence: 99%

Section: Comfortmentioning

confidence: 99%

See 1 more Smart Citation

Ten questions about radiant heating and cooling systems

Rhee

Olesen²,

Kim

2017

Building and Environment

239

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“…According to Heschong (2002), students with the greatest access to window areas or daylight obtain 7% to 18% higher scores than other students. This mean that the cafeteria also need open ventilation and open space so that the daylight can be move in the cafeteria.…”

Section: Poor Performance and Healthmentioning

confidence: 99%

“…The indoor condition of hostel cafeteria can make people spent more time in the cafeteria. Based on Hao et al (2007), displacement ventilation gives good indoor air quality although it creates a huge vertical temperature gradient that leads to thermal discomfort, which may result in decreased productivity.…”

Section: Effects Of Thermal Condition On Occupantsmentioning

confidence: 99%

Significance of Thermal Comfort in Buildings and Its Relation to the Building Occupants

Khairil¹,

Senin²,

Mydin³

2013

European Journal of Technology and Design

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Abstract. It should be pointed out that indoor climates in buildings is significant to the accomplishment of a building not only in making it comfortable, but also in deciding its energy consumption holistically and the thermal comfort of the occupants in the building. Thermal comfort can be defined as a psychological state of mind, often expressing a sensation of considerable heat or cold and it occurs when there is a balanced exchange of heat between a person's body and the environment, marked by the absence of regulatory sweating. Thermal comfort is imperative in both psychological and physical aspect where it could affects morale of the people. Based on their degree of thermal comfort, residents may complain, productivity may suffer and in some situations, people may refuse to work in a particular environment. This paper will discuss thoroughly the concept of thermal comfort, effects of thermal condition on occupants and some of the significant factors that influencing thermal comfort. In addition, thermal transition between the external environment and internal spaces of the buildings, human body interaction with surroundings and effective comfort range will also be presented to get a clear picture on how thermal comfort affects the building occupants comprehensively.

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Experimental performance of a thermoelectric ceiling cooling panel

Lertsatitthanakorn¹,

Srisuwan²,

Atthajariyakul³

2008

Int. J. Energy Res.

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SUMMARYAn experiment has been performed to investigate the cooling performance of a thermoelectric ceiling cooling panel (TE-CCP). The TE-CCP was composed of 36 TE modules. The cold side of the TE modules was fixed to an aluminum ceiling panel to cool a test chamber of 4:5 m 3 volume, while a copper heat exchanger with circulating cooling water at the hot side of the TE modules was used for heat release. Tests were conducted using various system parameters. It was found that the cooling performance of the system depended on the electrical supply, cooling water temperature and flow rate through the heat exchanger. A suitable condition occurred at 1.5 A of current flow with a corresponding cooling capacity of 289.4 W which gives the coefficient of performance (COP) of 0.75 with an average indoor temperature of 278C: Using thermal comfort test data in literature for small air movements under radiant cooling ceilings, results from the experiments show that thermal comfort could be obtained with the TE-CCP system.

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A combined system of chilled ceiling, displacement ventilation and desiccant dehumidification

Cited by 130 publications

References 13 publications

Ten questions about radiant heating and cooling systems

Ten questions about radiant heating and cooling systems

Significance of Thermal Comfort in Buildings and Its Relation to the Building Occupants

Experimental performance of a thermoelectric ceiling cooling panel

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