Numerical Study of Turbulent Flow and Convective Heat Transfer Characteristics in Helical Rectangular Ducts

Xing, Yanxia; Zhong, Fengquan; Zhang, Xinyu

doi:10.1115/1.4028583

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…Among these three, helical type GHE was reported to perform best albeit with higher installation cost [4]. This finding is consistent with past studies that reported higher heat transfer rates in helical channels compared to that of straight ones due to the induction of turbulent flow within the pipe [5]. With respect to the circulating heat transfer medium, ground source heat pumps that employ GHEs can be classified as regular geothermal heating/cooling systems or direct expansion-ground coupled heat 1094 (2022) 012008 IOP Publishing doi:10.1088/1755-1315/1094/1/012008 2 pumps (DX-GCHP).…”

Section: Introductionsupporting

confidence: 88%

Heat transfer optimization in a horizontal helical-shaped ground heat exchanger through response surface methodology

Malacas

Certeza

Alfonso

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Various combinations of objective functions and design variables have been considered in several optimization studies of ground heat exchangers (GHEs). In this study, the optimum values of the coil pitch and coil diameter of a helical-shaped GHE were determined to maximize its convection heat transfer rate. Central composite design was used to determine the coil pitch and coil diameter dimensions to be used in GHE modeling. Nine models were generated in Fusion360 which were then exported to ANSYS Fluent for CFD simulation. Then, a second-order model of the convective heat transfer rate per unit length as a function of the coil pitch and coil diameter was generated using the response surface methodology. For the design space considered (coil pitch: 600 to 1200 mm; coil diameter: 600 to 1200mm), the highest heat transfer rate was achieved at a coil diameter of 600mm and at a coil pitch of 1200mm. Furthermore, this study showed that if both the coil pitch and coil diameter are considered simultaneously in the optimization of the heat transfer rate of a helical-shaped GHE, then coil pitch would have a directly proportional relationship with the heat transfer rate, while coil diameter would have an inversely proportional relationship.

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Section: Introductionsupporting

confidence: 88%

Heat transfer optimization in a horizontal helical-shaped ground heat exchanger through response surface methodology

Malacas

Certeza

Alfonso

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…From the results of numerical simulation, we found that the cyclic thermal action had differences on the distribution of indoor temperature field for different roof structures. At the same time, the roles of roof forms applicable to farm buildings on different temperate zones in summer thermal insulation were also different 31 .…”

Section: Resultsmentioning

confidence: 99%

Comparative study on numerical simulation of temperature field of farm house with different roof forms

Pan,

Zhao,

Wang

2024

Sci Rep

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In recent years, the issue of energy consumption in farm buildings has received much attention. The roofs of farm buildings in Northwest China have a variety of roof forms. This paper presents the implementation of first fully confirmed the indoor thermal environment of different roof construction was significantly effected by periodic thermogenesis. In order to determine the indoor temperature distribution of the farmhouse in summer in Ningxia Hui Autonomous Region, we provided the heat transfer coefficient data of the farmhouse envelope, also detailed in the manuscript. Model of Thermal Mass Transport enables fast and accurately simulates the indoor temperature distribution of farmhouses with different roof forms on the same day, taking into account the climate zone of the region. This is despite the phase delay time of indoor temperatures for different roof forms caused by periodic initial temperature boundaries ranged from 1.55 to 2.78$$\text{h}$$ h , and the phase delay angle ranged from 23.25$$^{\circ }$$ ∘ to 41.7$$^{\circ }$$ ∘ . Extensive simulated results revealed individual variability in the role of roof form, demonstrating indoor temperatures in farmhouses corresponding to different climatic zones. In addition, by analyzing and discussing the indoor temperature phase delay angle and delay time for each type of roof forms, statistical results identified the advantages of Non-equal-sloped roof as a local farmhouse roof.

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“…Among the various passive methods, one promising method is the application of coiled tubes. For decades, coiled tubes have been a major focus in heat transfer engineering due to its high heat transfer rate and compactness [1][2][3]. Their unique characteristics have attracted considerable attention from researchers worldwide.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer performance of non-circular coiled tubes - Research summary, challenges and directions

Kurnia¹,

Sasmito²

2022

Int. J. Automot. Mech. Eng.

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Coiled tubes have been widely used in major industries due to their high heat transfer, ease of manufacturing and compactness. Numerous studies have been conducted experimentally and numerically to evaluate the heat transfer performance of coiled tubes. A majority of these studies were focused on circular tubes, while only limited studies were concerned on non-circular tubes. Recently, a series of computational studies have been conducted in our research group to investigate the flow characteristic and heat transfer performance of non-circular coiled tubes. Several key parameters affecting flow behavior and heat transfer performance have been evaluated and examined. The heat transfer performance is numerically evaluated and compared by utilizing the concept of Figure of Merit (FoM). The paper is intended to provide an essential summary of these numerical studies with the aim of providing a general overview of the advantage and drawbacks of non-circular coiled tubes in thermal engineering applications. Challenges and directions of the research will also be discussed. In general, it is revealed that heat transfer improvement in the coiled tube is followed by increasing pumping power. Moreover, with a more complex coiled geometry proposed, the processes of manufacturing the tube and creating the computational domain will become major issues in non-circular coiled tube studies. In addition, more studies on the application of coiled tubes used for heat exchanger and chemical reactor are expected to increase in the future, especially in the micro or nanoscale.

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Numerical Study of Turbulent Flow and Convective Heat Transfer Characteristics in Helical Rectangular Ducts

Cited by 7 publications

References 21 publications

Heat transfer optimization in a horizontal helical-shaped ground heat exchanger through response surface methodology

Heat transfer optimization in a horizontal helical-shaped ground heat exchanger through response surface methodology

Comparative study on numerical simulation of temperature field of farm house with different roof forms

Heat transfer performance of non-circular coiled tubes - Research summary, challenges and directions

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