Application of radiant floor cooling in a large open space building with high-intensity solar radiation

Zhao, Kang; Liu, Xiaohua; Jiang, Yi

doi:10.1016/j.enbuild.2013.07.014

Cited by 84 publications

(27 citation statements)

References 10 publications

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“…By reducing the size of the suspended ceiling required for ventilation, since a lower air volume is required, the height of the building can be reduced which results in reduction of building's materials (Babiak et al 2013). In addition, when using high temperature cooling and low temperature heating systems where the medium temperature needed for cooling/heating is closer to the room temperature, it increases the energy efficiency of heat pumps and ground source heat exchangers (Babiak et al 2013;Zhao et al 2013). The ventilation noise level and the risk of draught are reduced and they provide a more uniform thermal environment compared to mixing ventilation systems (Olesen 1997;Olesen 2008).…”

Section: Introductionmentioning

confidence: 99%

Daytime space cooling with phase change material ceiling panels discharged using rooftop photovoltaic/thermal panels and night-time ventilation

Bourdakis

Péan

Gennari

et al. 2016

Science and Technology for the Built Environment

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Section: Introductionmentioning

confidence: 99%

Daytime space cooling with phase change material ceiling panels discharged using rooftop photovoltaic/thermal panels and night-time ventilation

Bourdakis

Péan

Gennari

et al. 2016

Science and Technology for the Built Environment

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“…Miriel et al [12] developed a ceiling-panel system model that operates with a temperature at 16°C. Zhao et al [13] analyzed the performance of a radiant cooling system with supply water temperature of 18°C in a large-space building in China. Lehmann et.…”

Section: Introductionmentioning

confidence: 99%

Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings

Maccarini

Wetter

Afshari

et al. 2017

Energy and Buildings

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This paper analyzes the performance of a novel two-pipe system that operates one water loop to simultaneously provide space heating and cooling with a water supply temperature of around 22°C.To analyze the energy performance of the system, a simulation-based research was conducted. The two-pipe system was modelled using the equation-based Modelica modeling language in Dymola.A typical office building model was considered as the case study. Simulations were run for two construction sets of the building envelope and two conditions related to inter-zone air flows. To calculate energy savings, a conventional four-pipe system was modelled and used for comparison.The conventional system presented two separated water loops for heating and cooling with supply temperatures of 45°C and 14°C, respectively. Simulation results showed that the two-pipe system was able to use less energy than the four-pipe system thanks to three effects: useful heat transfer from warm to cold zones, higher free cooling potential and higher efficiency of the heat pump. In particular, the two-pipe system used approximately between 12% and 18% less total annual primary energy than the four-pipe system, depending on the simulation case considered. KeywordsEnergy saving, HVAC systems, low-exergy, simulation, Modelica, active beams

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“…This feature of radiant systems may impact design and operation in many ways. For example, radiant floor systems have wide applications in conditioning areas with high solar load, such as atriums and lobbies, because they are considered to be especially effective at removing solar load with enhanced cooling capacity reaching 100 W/m 2 [3,20]. The fast responsive feature is considered advantageous for maintaining thermal comfort when compared to air systems.…”

Section: Discussionmentioning

confidence: 99%

Experimental comparison of zone cooling load between radiant and air systems

Feng

Bauman

Schiavon

2014

Energy and Buildings

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(Jingjuan (Dove) Feng) Highlights We experimentally compared cooling loads between radiant and air systems  Radiant system has on average 18%-21% higher cooling rates compared to air system  A new definition must be used for radiant system cooling load  HB approach should be used for radiant system cooling load calculation  RTS or weighting factor methods may lead to incorrect results for radiant systems AbstractRadiant cooling systems work fundamentally differently from air systems by taking advantage of both radiant and convective heat transfer to remove space heat. This paper presents an experiment investigating how the dynamic heat transfer in rooms conditioned by a radiant system is different from an air system, and how such differences affect the sensible cooling load and cooling load calculation methods for radiant systems. Four tests with two heat gain profiles were carried out in a standard climatic chamber. For each profile, two separate tests were carried out to maintain a constant operative temperature: one with radiant chilled ceiling panels; and a second with an overhead mixing air distribution system. Concrete blocks were used to create a thermal mass effect. The experiments show that, during the periods the heat gain was on, the radiant system has on average 18%-21% higher instantaneous cooling rates compared to the air system, and 75-82% of total heat gains were removed, while for the air system only 61-63% were removed. Based on the study, we conclude that a new definition must be used for radiant system cooling load, which should be characterized as the combined radiant and convective heat removal at the cooled surface. Calibrated dynamic energy simulation based on a fundamental heat balance approach showed good accuracy. Simplified cooling load calculation methods, such as RTS or weighting factor method, may lead to incorrect results for radiant systems.

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Application of radiant floor cooling in a large open space building with high-intensity solar radiation

Cited by 84 publications

References 10 publications

Daytime space cooling with phase change material ceiling panels discharged using rooftop photovoltaic/thermal panels and night-time ventilation

Daytime space cooling with phase change material ceiling panels discharged using rooftop photovoltaic/thermal panels and night-time ventilation

Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings

Experimental comparison of zone cooling load between radiant and air systems

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