Simplified model for heat transfer and surface temperature of prefabricated radiant heating and cooling system

Wang, Yunfeng; Wu, Xiaozhou; Gao, Jie; Airong, Feng; Wang, Jun; Liu, D.; Zhou, Xiang

doi:10.1016/j.enbuild.2022.112522

Cited by 14 publications

(9 citation statements)

References 28 publications

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“…Many scientists and researchers around the world are investigating large-scale radiant systems. Significant results of their research are published, for example, in papers [32][33][34][35][36][37][38]. The ATP system's heat exchange represents a combination of convection and radiation-based heat transfer.…”

Section: Basic Calculation Of Large-scale Radiant Heatingmentioning

confidence: 99%

Section: Basic Calculation Of Large-scale Radiant Heatingmentioning

confidence: 99%

“…where a u is the covering factor (-); α = 10.8 W/(m 2 •K); λ u,0 = 1 W/(m 2 •K); s u,0 = 0.045 m; a K is the correction coefficient of coupling in compliance, Table 2; a k = f (T); a WL is the thermal conductivity coefficient, Table 3; a WL = f (K WL , L, D); ∆θ H is the average temperature of the heating substance ( • C), Formula (14) [35][36][37][38][39][59][60][61][62][63]. Tables for K WL = 0.1; 0.2; 0.3; 0.4; 0.5 and above; see STN EN 1264-2, where K WL is the coefficient of the heat conducting element for type B (-) systems [45][46][47][48][49][50][51][52][53][54]:…”

Section: Standard Calculation Of Large-area Radiant Heating Parametersmentioning

confidence: 99%

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Contribution to Active Thermal Protection Research—Part 1 Analysis of Energy Functions by Parametric Study

et al. 2023

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The thermal energy consumption for heating objects is one of the main parameters deciding their technical and structural solution. Reducing energy consumption is realized in various ways. The most used method is passive thermal protection, that is, increasing the thermal insulation parameters of the envelope constructions and optimizing the operation of the technical equipment of the buildings. There are also methods of active thermal protection to reduce heat leakage through non-transparent parts of the building envelope. Active thermal protection (ATP) is a dynamic process that applies primarily to building structures with integrated energetically active elements that fulfill one or more functions in mutually exclusive operating modes of energy systems and heat sources, such as thermal barriers (TB), large-scale heating/cooling, long-term heat/cool storage, capturing solar energy, and energy from the surroundings or even recovering heat in the cold season or cold in the warm season and other combinations. The research area focuses on analyzing active thermal protection’s energy potential. The methodology is based on a parametric study of dynamic thermal resistance (DTR), and heat flows to the interior and exterior from ATP for the investigated envelope of the experimental house EB2020 made of aerated concrete blocks. Such constructions generally show a consistently high DTR of 11.8 to 30.8 ((m2·K)/W) at a low mean heat transfer temperature of 10 to 16 °C, corresponding to the thermal insulation of 300 to 1000 mm. In the case of ATP storage heating with an average temperature of the heat-carrying substance of 30 °C, the heat flow into the interior of the investigated structure would be only 2.31 W/m2. Therefore, they are only suitable for a thermal barrier and heat/cold accumulation. Based on the synthesis and induction of analogical forms of the results of previous research into recommendations for the design of individual energy functions of ATP for perimeter structures of buildings, we present heat flows to the interior/exterior when changing the material of the layers towards the interior from ATP and describe possible variants of the development of building structures with integrated energetically active elements.

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Section: Basic Calculation Of Large-scale Radiant Heatingmentioning

confidence: 99%

Section: Basic Calculation Of Large-scale Radiant Heatingmentioning

confidence: 99%

Section: Standard Calculation Of Large-area Radiant Heating Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Contribution to Active Thermal Protection Research—Part 1 Analysis of Energy Functions by Parametric Study

et al. 2023

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“…Idea of creating such models is not new and there are a number of publications that touch on this topic in one form or another [6,7,8]. However, our goal was to develope, verify and describe a tool that will allow to perform all the calculations necessary for the design of radiantpanel capillary heating and cooling system that third-party users can use.…”

Section: Introductionmentioning

confidence: 99%

Model of radiant capillary heating and cooling system

Bolotin

Jakovičs

Teličko

2023

J. Phys.: Conf. Ser.

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Paper is devoted to the development and verification of a tool for modeling and designing radiant-panel heating and cooling systems. Source of radiation is capillary mats, which consist of tubes through which water flows with a temperature of 18°C to 32°C, depending on the operating mode. The tool is an analytical model that takes into account the radiation from capillary mats located on the ceiling and walls, the mutual radiation of all surfaces in the room, including doors and windows, simplified convection, as well as third-party sources of thermal energy, such as the sun, electronics and people. The model was compared with a similar numerical model created in Comsol Multiphysics, and also verified by experimental data.

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“…Zheng et al [18] investigated the effects of different parameters on the heat transfer performance of radiant floor systems under the influence of solar radiation and analyzed the heat transfer process in the room after the addition of solar radiation by establishing an R-C model. Wang et al [19] established the simplified numerical models for calculating the heat transfer and surface temperature of prefabricated floor or ceiling terminals. The heat transfer models were validated by using the radiant plate surface temperature.…”

Section: Introductionmentioning

confidence: 99%

Developing a Practical Thermal Performance Index for Radiant Terminals—Structural Thermal Resistance

Zhou,

Wang,

Liu

et al. 2023

Buildings

Self Cite

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Radiant terminals have been widely applied in heating and cooling systems. However, few existing thermal performance evaluation indices can reflect the influence of structural forms on heat transfer performance. This study introduces the structural thermal resistance (Rs) to rapidly evaluate the structure form’s effects. First, theoretical analysis and experimental tests were introduced. Three types of terminals, including the copper conduit graphite plate (CCGP), plastic tube-embedded metal plate (PTMP), and capillary network-embedded structural plate (CNSP) were tested in the laboratory. Then, the CNSP terminals were taken as validation examples. The results show that the Rs values of the same type of radiant terminal tend to be stable and constant. The variations in Rs within the same type of radiant terminals were small both under cooling and heating conditions. Only when the terminal structure changed, the Rs would change. This suggests that the Rs can reflect the complex heat transfer processes inside the radiant terminals while distinguishing different terminal types. The validation analysis showed an average relative error of 3.4% and 2.9% for cooling and heating, respectively. Lastly, the potential application of Rs in practical applications was discussed, and a Python-based online tool was developed to help design, operate, and evaluate radiant terminals.

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Simplified model for heat transfer and surface temperature of prefabricated radiant heating and cooling system

Cited by 14 publications

References 28 publications

Contribution to Active Thermal Protection Research—Part 1 Analysis of Energy Functions by Parametric Study

Contribution to Active Thermal Protection Research—Part 1 Analysis of Energy Functions by Parametric Study

Model of radiant capillary heating and cooling system

Developing a Practical Thermal Performance Index for Radiant Terminals—Structural Thermal Resistance

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