Influence of flow non-uniformity on the dynamic behaviour of three-fluid cross-flow compact heat exchanger

Aasi, Harpreet Kaur; Mishra, Manish

doi:10.1016/j.ijthermalsci.2019.106177

Cited by 18 publications

(3 citation statements)

References 22 publications

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“…It is used effectively in heating water and air (a room) simultaneously, thermal energy utilization processes, refrigeration system, processing of food and dairy, and so on. [1][2][3][4] Belal Almasri et al 5 have used NMFHE inserting helical coil tube for thermal-hydraulic performance augmentation in residential heating. They have used solar energy and Taguchi Gray relational method is used to calculate the maximum HT and minimum pressure drop (PD) in NMFHE.…”

Section: Introductionmentioning

confidence: 99%

“…Inserting helical coils in three fluid heat exchangers (TFHE) considers an improvement in design for the performance enhancement of HE. It is used effectively in heating water and air (a room) simultaneously, thermal energy utilization processes, refrigeration system, processing of food and dairy, and so on 1–4 . Belal Almasri et al 5 have used NMFHE inserting helical coil tube for thermal‐hydraulic performance augmentation in residential heating.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of three fluid heat exchangers using roughness on the outer surface of a helical coil

Ahamad,

Verma

2024

Heat Trans

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The aim of this study is to utilize waste thermal energy from industries into useful heat for water and air heating. In this paper, the thermal modeling and performance of three fluid heat exchangers (TFHE) have been experimentally investigated. The TFHE considered here is an enhanced version of the double‐pipe heat exchanger. A novel TFHE having fin (1 mm thin copper wire of 10 mm pitch) acts as a roughness element, which is wrapped on the helical coil's outer surface for increasing heat transfer (HT) rate and the turbulence effect for normal water, and this outer surface finned helical coil is inserted between two concentric straight tubes. The innermost tube carries atmospheric air, the finned helical coil tube carries waste hot fluid while normal water flows in the inner annulus of the outermost tube. The coiled‐side Reynolds number is varied in the range of 7000–30,000, while the curvature ratio of 0.1315, pitch‐to‐inside diameter ratio of 2.88 and wire‐to‐tube diameter of the helical tube is kept constant. A counterflow arrangement has been made for experimentation. Nusselt number is calculated using the traditional Wilson plot method that is compared and validated with results available in the literature. The overall HT coefficient is found to increase by increasing the volume flow rate of fluids, while effectiveness decreases or increases depending on residence time and capacity ratio. The percentage increment in the Nusselt number, maximum friction factor, overall HT coefficient between waste hot fluid to normal water, effectiveness is found to be 21.10%–23.88%, 90.91%, 3.40%–29.45%, 3.40%–25.33%, respectively, for the coil side. TFHE is thus proposed for heating water and space simultaneously.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of three fluid heat exchangers using roughness on the outer surface of a helical coil

Ahamad,

Verma

2024

Heat Trans

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“…An analytical solution for the temperature distributions of three fluids using FDT method is calculated by Bagyalakshmi et al 22 Whereas, analytical solutions of temperature distribution in a 2FCFHXs are determined by Dixit and Ghosh 23 . Harpreeth Kaur and Manish Mishra 24,25 also attempted the experimental solutions regarding flow nonuniformities in a three fluid HXs and by Dixit and Ghosh 26 toward effects of surroundings on a 2FCFHX. Thermal fluid HX analysis on concentric and helical type HXs is also carried out by some researchers 27–29 .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the thermal performance of cross‐cocurrent and countercurrent three fluid heat exchanger with flow maldistribution at the inlet

Jyothiprakash

2023

Heat Trans

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Flow maldistribution at the inlet of a heat exchanger (HX) is a significant parameter that needs to be considered to judge the performance of the same. In this paper, four arrangements of three-fluid cross-flow heat exchanger (3FCFHX) with different flow conditions are considered as shown in Figure 1 in which is the performance of cross-countercurrent and cross-cocurrent arrangements for uniform and flow maldistribution at the inlet. In addition, the effect of different inlet fluid flow models on the HX performance are investigated numerically. Among the three fluids in these arrangements, the central fluid is considered to be the hot fluid. From the principles of conservation of energy, the governing equations for three fluids are generated and solved using the finite element method. Four different inlet fluid-flow models are considered for the analysis. Performance is judged using hot fluid effectiveness and the number of transfer units for a different range of governing parameters. The effects of inlet flow maldistribution (IFM) are measured using degradation factors. The results show that the performance of cross-cocurrent arrangement is found to be superior to the cross-countercurrent arrangement. In addition, the IFM enhances thermal performance. Further, it is determined that the flow maldistribution at the

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Review on Enhancement of Thermal Capacity in Heat Exchangers with Various Nanofluids

Kumari¹,

Pandey²,

Bapu³

2022

Lecture Notes in Mechanical Engineering

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Influence of flow non-uniformity on the dynamic behaviour of three-fluid cross-flow compact heat exchanger

Cited by 18 publications

References 22 publications

Experimental investigation of three fluid heat exchangers using roughness on the outer surface of a helical coil

Experimental investigation of three fluid heat exchangers using roughness on the outer surface of a helical coil

Numerical investigation on the thermal performance of cross‐cocurrent and countercurrent three fluid heat exchanger with flow maldistribution at the inlet

Review on Enhancement of Thermal Capacity in Heat Exchangers with Various Nanofluids

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