Influence of geometrical parameters on the flow characteristics of multi-pipe earth-to-air heat exchangers – experimental and CFD investigations

Amanowicz, Łukasz

doi:10.1016/j.apenergy.2018.05.096

Cited by 65 publications

(27 citation statements)

References 12 publications

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“…While different papers deal with the interaction of EAHX with surrounding soil, and benefits or risks in design, only a handful papers deal with the annual cycles of field performance [16][17][18]. As we do not have any concise guidance for integration of EAHX with other subsystems in the building, an objective of the Cracow University project and of the following paper was to develop a basis for such guidance.…”

Section: Introductionmentioning

confidence: 99%

On Preheating of the Outdoor Ventilation Air

et al. 2019

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The growing popularity of buildings with integrated sub-systems requires a review of methods to optimize the preheating of ventilation air. An integrated system permits using geothermal heat storage parallel to the direct outdoor air intake with additional treatment in the mechanical room as a part of building an automatic control system. The earth–air heat exchanger (EAHX) has many advantages but also has many unanswered questions. Some of the drawbacks are: A possible entry of radon gas, high humidity in the shoulder seasons, and the need for two different air intake sources with a choice that depends on the actual weather conditions. In winter the EAHX may be used continuously to ensure thermal comfort, while in other seasons its operation must be automatically controlled. To generate missing information about EAHX technology we examined two nearly identical EAHX systems, one placed in the ground next to a building and the other under the basement slab. In another project, we reinforced the ground storage action by having a heat exchanger placed on the return pipes of the hydronic heating system. The information provided in this paper shows advantages of merging both these approaches, while the EAHX could be placed under the house or near the basement foundation that is using an exterior basement insulation.

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Section: Introductionmentioning

confidence: 99%

On Preheating of the Outdoor Ventilation Air

et al. 2019

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“…In recent research, Mroslaw et al [13] conducted a comparison study of the thermal performance of GAHX, Cuny et al [14] studied GAHX on different soil types, Amanowicz, Ł. [15] performed GAHX CFD on different pipe paths, however, it did not include pipe shape. Zhao et al [16] and Noorollahi et al [17] have studied parametric design of GAHX, Agrawal et al [18,19] discussed recent research trends on GAHX and GAHX effect on climate and soil conditions.…”

Section: Introductionmentioning

confidence: 99%

Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

et al. 2019

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Ground-air heat exchangers have become an important topic in recent years due to their contributions to the market growth of the ground source heat pump industry. This paper provides a comprehensive study and recommends suggestions on the selection process of a suitable pipe for an air-to-water heat pump (AWHP). Parametric studies including material, turbulent plate quantity, and pipe type were performed to identify an optimal pipe design for high-performance AWHP. Both numerical and experimental studies were carried out to validate current pipe models. Overall, there was good agreement between the numerical model and experimental results. It was determined that a spirally corrugated pipe exhibited excellent thermal power generation with little compromising pressure drop. Finally, a pipe selection example was demonstrated as a design guideline to size an optimal pipe for AWHP application.

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“…In order to obtain the minimum energy loss, it is necessary to analyze the sensitivity of the geometric parameters of the MCCS structure to pressure loss and pressure drop. At the present time, few studies address MCCS structure, but many researchers have studied the application of similar structures, such as flow distribution devices [8,9], heat exchangers [10,11], and thermal solar collectors [12,13]. The different structures depend on the applications in the relevant equipment.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have focused on the engineering application of the elbows and T-junctions under the premise of basic study. For example, in [10], the efficiency of the heat exchangers was investigated by the change of multi-pipe exchanger geometry with the help of experimental and CFD study approaches. In [12], to optimize solar collector efficiency, the flow characteristics with uniformity and pressure loss as indicators were analyzed by changing the riser tubes' Reynolds number and the diameter of each riser tube by numerical and experimental approaches.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of the Influence of Geometric Parameters on the Performance of a Multi-Channel Confluent Water Supply

Zhao¹,

Li²,

Zhu³

2019

Energies

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Transportation efficiency is a problem of particular interest in multi-channel confluent water supply engineering. Transportation efficiency depends not only on the system control strategy but also on the pressure loss (pressure difference between the inlet and outlet) and pressure drop (amplitude of outlet pressure fluctuations) of its structure. In this article, sensitivity analyses of the pressure loss and pressure drop to changes in multi-channel confluent water supply geometry are presented. An experimental set-up was established to validate computational fluid dynamic (CFD) predictions and obtain the boundary conditions for two-channel synchronous switching. The influences of the geometric structure varies by the clustered pipe diameter (40 mm < Dc < 80 mm), main pipe diameter (30 mm < Do < 80 mm), channel pitch (60 mm < L < 400 mm) and number of channels (2 ≤ n ≤ 4); those variables were investigated with the help of CFD simulations. The results showed that configuration “C” can be considered a costless method of decreasing pressure loss (βC(2.05) < βA(2.42) < βB(2.64)) and that the different configurations are insensitive to pressure drop. The variations of the influence of channel pitch and clustered pipe diameter on pressure loss have extremes at L/d = 5 and Dc/d = 2.5, respectively, but the effect on pressure drop is not obvious. The main pipe diameter and the inlet velocity have more significant influences on efficiency. The results can be used to choose the proper geometry of multi-channel confluent water supply to enable energy savings.

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Influence of geometrical parameters on the flow characteristics of multi-pipe earth-to-air heat exchangers – experimental and CFD investigations

Cited by 65 publications

References 12 publications

On Preheating of the Outdoor Ventilation Air

On Preheating of the Outdoor Ventilation Air

Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

A Numerical Investigation of the Influence of Geometric Parameters on the Performance of a Multi-Channel Confluent Water Supply

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