A computational model of an improved cooling radiant ceiling panel system for optimization and design

Su, Xiaosong; Zhang, Ling; Liu, Zhongbing; Luo, Yongqiang; Lian, Jinbu; Luo, Yongwei

doi:10.1016/j.buildenv.2019.106312

Cited by 42 publications

(5 citation statements)

References 39 publications

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“…One common way to increase the total heat dissipation is to increase the heat transfer surface. There have been many types of research about engineering plastic capillary mats used in HVAC systems [27][28][29][30][31][32], and it was found that the use of engineering plastic capillary mats can make the distribution of the environment temperature more uniform. Therefore, PE (polyethylene) capillary mats were used in the experiment.…”

Section: Engineering Plastic Capillary Mats Methodsmentioning

confidence: 99%

Study of the Technologies for Freeze Protection of Cooling Towers in the Solar System

et al. 2022

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A cooling tower is an important guarantee for the proper operation of a solar system. To ensure proper operation of the system and to maintain high-efficiency points, the cooling tower must operate year-round. However, freezing is a common problem that degrades the performance of cooling towers in winter. For example, the air inlet forms hanging ice, which clogs the air path, and the coil in closed cooling towers freezes and cracks, leading to water leakage in the internal circulation. This has become an intractable problem that affects the safety and performance of cooling systems in winter. To address this problem, three methods of freeze protection for cooling towers are studied: (a) the dry and wet mixing operation method—the method of selecting heat exchangers under dry operation at different environments and inlet water temperatures is presented. The numerical experiment shows that the dry and wet mixing operation method can effectively avoid ice hanging on the air inlet. (b) The engineering plastic capillary mats method—its freeze protection characteristics, thermal performance, and economics are studied, and the experiment result is that polyethylene (PE) can meet the demands of freeze protection. (c) The antifreeze fluid method—the cooling capacity of the closed cooling towers with different concentrations of glycol antifreeze fluid is numerically studied by analyzing the heat transfer coefficient ratio, the air volume ratio, the heat dissipation ratio, and the flow rate ratio. The addition of glycol will reduce the cooling capacity of the closed cooling tower.

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Section: Engineering Plastic Capillary Mats Methodsmentioning

confidence: 99%

Study of the Technologies for Freeze Protection of Cooling Towers in the Solar System

et al. 2022

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“…With this in mind, engineers are trying to apply more and more efficient systems to cool the room, including radiant panel cooling systems (RPCS). In addition to the possibility of constant operation in all periods of the year for cooling or heating the rooms, its advantages are high hygienic qualities and a reduction in the installed capacity of the applied refrigeration machines [1][2][3][4][5]. Since RPCS are not widespread in the Russian Federation at the moment, there is no extensive experience in designing and operating such systems, research in this direction is relevant, and the works of foreign scientists are of interest [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Ensuring microclimate parameters in the room using radiant ceiling panel cooling systems

Malikova

2023

E3S Web Conf.

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The actual purpose of the study was to develop technical solutions for organizing of a panel-radiant cooling system using ceiling devices in a multifunctional building, as well as the calculated justification of its use in comparison with an alternative cooling system: a classic central air conditioning system and a "chiller - fan coil". The comparison was carried out according to the indicators of the microclimate comfort in the serviced room, taking into account the feasibility study. The evaluation method was used to determine the comfort factor of a person's thermal state, taking into account correction coefficients for the main hazards characteristic of multifunctional public buildings. The use of radiant ceiling panel cooling systems increases the comfort of people in the room due to the fact that there are no convective jets with low temperature and high air velocity. At the same time, the most favorable temperature allocation over the height of the room is maintained.

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“…Experiments were carried out on two CRCP-s, and the results showed that the outlet water temperature and cooling capacity predicted by the model were in good agreement with the experimental measurements. By introducing an inner air layer into the improved ceiling radiant cooling panels (CRCP) system, Su et al [ 7 ] established a computational model for the heat transfer analysis of the improved CRCP system and verified it experimentally. The results show that thicker aluminum plates, thicker heat exchange plates, and thinner air layers increase cooling capacity.…”

Section: Introductionmentioning

confidence: 99%

A New Type of Air Conditioning System Based on Finned Ceiling Radiant Coupled with Independent Fresh Air and Its Thermal Comfort Experimental Study

Qin

et al. 2022

Computational Intelligence and Neuroscience

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The traditional radiation air conditioning system has some problems, such as easy condensation, insufficient refrigeration capacity, complex structure, and control system. Therefore, this study proposes a new type of finned metal radiant plate with large heat flow per unit area, sufficient cooling capacity, and simplified heat exchange system, in order to realize large temperature difference between cooling and heating. The temperature field uniformity and thermal comfort test of a novel type of finned ceiling radiant panel and independent fresh air linked air conditioning system under summer cooling and winter heating circumstances are accomplished through artificially generated climate environments. The study's findings demonstrate that in the radiation and fresh air modes, the maximum interior temperature differential under cooling conditions does not rise over 2.1°C. The maximum temperature differential in the space at any one moment in the radiation and fresh air modes cannot be greater than 3°C when heating conditions are present. The fresh air's cooling and dehumidifying effects are clear. The dehumidification efficiency may reach 50%, and the moisture content ranges from 5.48 to 9.63 g/kg. With PMV ranging from −0.34 to 0.54, the enhanced air conditioning system in this research provides exceptionally good thermal comfort. Additionally, the finned radiant panel's installation area occupies just 14% of the ceiling, which is sufficient to fulfill the room's cooling and heating load needs as well as provide high thermal comfort and consistent indoor temperature. The theoretical investigation and practical implementation of the direct expansion radiant air conditioning system are both strongly supported by this research.

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A computational model of an improved cooling radiant ceiling panel system for optimization and design

Cited by 42 publications

References 39 publications

Study of the Technologies for Freeze Protection of Cooling Towers in the Solar System

Study of the Technologies for Freeze Protection of Cooling Towers in the Solar System

Ensuring microclimate parameters in the room using radiant ceiling panel cooling systems

A New Type of Air Conditioning System Based on Finned Ceiling Radiant Coupled with Independent Fresh Air and Its Thermal Comfort Experimental Study

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