Condensation Heat Transfer of R-407C in Helical Coiled Tube Heat Exchanger

Alhajeri, Hamad M.; Almutairi, Abdulrahman; Al-Hajeri, M. H.; Alenezi, Abdulrahman; Alajmi, R.; Koluib, A. M.

doi:10.3390/pr8091157

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…Different configurations of HCHE such as square helical coil, conical helical coil, double pipe helical coil, tube-in-tube helical coil, coil in the flue and Advances in Chemical Engineering and Science conventional helical coil exchangers in which their usefulness depend on. HCHE has different applications such as in heating ventilation and air-conditioning (HVAC) systems, the power generation industry, the nuclear industry, chemical processing plants, heat recovery systems, refrigeration, the food industry, and residual heat removal systems [22] [23]. Also, the compact structure and high heat transfer coefficient gave HCHE advantages over other exchangers when cost saving and space are of essence.…”

Section: Helical Coil Heat Exchangermentioning

confidence: 99%

Mathematical Modelling and Design of Helical Coil Heat Exchanger for Production of Hot Air for Fluidized Bed Dryer

Uwa,

Inyang,

Oboh

2024

ACES

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In global industrialization, efforts have been made to increase the rate of heat transfer in heat exchanger, minimizing the size of heat exchanger to reduce cost as well as increasing the effectiveness. Helical coil heat exchanger (HCHE) has been proven to be effective in improving heat transfer due to its large surface area. In this study, HCHE was designed to provide hot air needed for fluidized bed drying processes. The HCHE design model was fabricated and evaluated to study the efficiency of the hot air output for a laboratory fluidized bed dryer. The mathematical model for estimation of the final (output) temperature of air, T af , passing through the HCHE was developed and validated experimentally. The drying of bitter kola particulates was carried out with a drying temperature of 50˚C ± 3˚C and a bed height-to-bed diameter ratio (H/D) of 1.5. The time taken to dry bitter kola particulates to 0.4% moisture content was 1 hour 45 minutes. Hence, HCHE is recommended for use in the production of hot for laboratory-scale fluidized bed dryers.

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Section: Helical Coil Heat Exchangermentioning

confidence: 99%

Mathematical Modelling and Design of Helical Coil Heat Exchanger for Production of Hot Air for Fluidized Bed Dryer

Uwa,

Inyang,

Oboh

2024

ACES

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“…A significant enhancement, ranging between 4% to 13.8%, was discerned in condensation HTC within the helical section compared to its straight counterpart. Another research effort highlighted the influence of the cooling medium temperature on R-407C condensation rates [8], covering a broad spectrum of mass fluxes for R-407C and coolant water. Here, the helical coiled tube's superiority over conventional smooth tubes in accelerating condensation rates was observed.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of Thermal Performance Augmentation in Helical Coil Heat Exchangers via CuO/Water Nanofluid

Batista,

Rajendran

2023

PEET

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Helical or spiral coiled heat exchangers, prevalent in industries such as power generation, heat recovery systems, the food sector, and various plant processes, exhibit potential for performance enhancement through optimal fluid selection. Notably, nanofluids, distinguished by their superior thermophysical properties, including enhanced thermal conductivity, viscosity, and convective heat transfer coefficient (HTC), are considered viable candidates. In this study, the thermo-physical attributes of helical coil heat exchangers (HCHEs), when subjected to nanofluids, were meticulously examined. During the design phase, Creo parametric design software was employed to refine the geometric configuration, subsequently enhancing fluid flow dynamics, thereby yielding a design improvement for the HCHE. Subsequent computational fluid dynamics (CFD) simulations of the heat exchanger were conducted via the ANSYS CFX program. A CuO/water nanofluid, at a 1% volume fraction, served as the basis for the CFD analysis, incorporating the Re-Normalisation Group (k − ε) turbulence model. From these simulations, zones exhibiting elevated temperature and pressure were discerned. It was observed that the wall HTC value for the CuO/water mixture surpassed that of pure water by 10.01%. Concurrently, the Nusselt number, when the CuO/water nanofluid was employed, escalated by 6.8% in comparison to utilizing water alone. However, it should be noted that a 5.43% increment in the pressure drop was recorded for the CuO/water nanofluid in contrast to pure water.

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“…Combined with the morphological development of the liquid film, it was helpful to understand the flow and heat transfer mechanism in the superheated zone. AlHajeri [23] et al investigated the condensation experiment in the spiral tube with R407c working medium and further studied the correlation between the wall undercooling and the heat transfer coefficient of the refrigerator. In comparison with straight tube, the spiral wound tube exhibited an increased condensation rate with a corresponding pressure drop, which was dependent on the value of saturation temperature of the refrigerant and temperature of the coolant.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Condensation Flow and Heat Transfer Characteristics Inside Spiral Tubes

Chen

Jiang

et al. 2023

Energies

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Spiral wound tube heat exchanger (SWHE) was confirmed as the core equipment of natural gas liquefaction (LNG). However, there was rare experimental research on large-scale SWHE for LNG, and the theory of heat transfer is not perfect. To investigate the tube-side flow and heat transfer characteristics in spiral tubes, an experimental system was proposed. To ensure the accuracy of the experimental data, the heat transfer coefficients of liquid propane under different conditions were measured, and the data acquired through the experiment were compared with two classical heat transfer correlation (Dittus–Boelter and Geielinski) under the identical working conditions. The applicability of the existing correlation was analyzed using the experimental data, and a novel heat transfer correlation was developed. As indicated by the results, the deviation between the experimental system and the classical correlation under the identical working condition was lower than ±10%. Furthermore, the error comparison between the novel correlation prediction value and the experimental data was less than ±15%.

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Condensation Heat Transfer of R-407C in Helical Coiled Tube Heat Exchanger

Cited by 8 publications

References 32 publications

Mathematical Modelling and Design of Helical Coil Heat Exchanger for Production of Hot Air for Fluidized Bed Dryer

Mathematical Modelling and Design of Helical Coil Heat Exchanger for Production of Hot Air for Fluidized Bed Dryer

Computational Analysis of Thermal Performance Augmentation in Helical Coil Heat Exchangers via CuO/Water Nanofluid

Analysis of Condensation Flow and Heat Transfer Characteristics Inside Spiral Tubes

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