Compact Heat Exchangers in Practice

Hesselgreaves, John E.; Law, Richard; Reay, David

doi:10.1016/b978-0-08-100305-3.00008-2

Cited by 59 publications

(36 citation statements)

References 11 publications

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“…Figure 11A,B shows the result of comparing the experimental results with the correlations of Oyakawa, Shinzato and Mabuchi and Kays and London [19], which, in terms of Reynolds number ranges and channel shape, are the most similar to the correlation proposed in this study. The Kays and London correlation shows a difference of 14.7% on average, and that of Oyakawa et al shows a difference of 33% from the present results for the PSHE used in this study.…”

Section: < Re < 622mentioning

confidence: 58%

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Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

Seo

Cho²,

Lee

et al. 2015

Entropy

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This paper presents the heat transfer and pressure drop characteristics of a primary surface heat exchanger (PSHE) with corrugated surfaces. The PSHE was experimentally investigated for a Reynolds number range of 156-921 under various flow conditions on the hot and cold sides. The inlet temperature of the hot side was maintained at 40˝C, while that of the cold side was maintained at 20˝C. A counterflow was used as it has a higher temperature proximity in comparison with a parallel flow. The heat transfer rate and pressure drop were measured for various Reynolds numbers on both the hot and cold sides of the PSHE, with the heat transfer coefficients for both sides computed using a modified Wilson plot method. Based on the results of the experiment, both Nusselt number and friction factor correlations were suggested for a PSHE with corrugated surfaces.

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Section: < Re < 622mentioning

confidence: 58%

“…Figure 12B shows a dimensionless friction factor according to the Reynolds number using Equation (11). In this figure, the subscript N refers to the number of stacked cells, and the correlation of the friction factor is represented as a function of the Reynolds number, as shown in Equation (19)…”

Section: Pressure Drop Characteristicsmentioning

confidence: 99%

Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

Seo

Cho²,

Lee

et al. 2015

Entropy

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“…Therefore, designing an adequate heat exchanger is crucial to enhance the overall ORC efficiency. Among the existing heat exchangers, 6,7 a printed circuit heat exchanger (PCHE) has been widely used due to its high compactness and effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer performance comparison of printed circuit heat exchangers with straight, zigzag and serpentine flow channels for waste heat recovery

Xie

Chueh

Chen

et al. 2021

Intl J of Energy Research

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Summary In the present study, a printed circuit heat exchanger (PCHE) is investigated numerically by solving the steady‐state Navier–Stokes equations and energy equation. The PCHE is equipped with straight, wavy, and serpentine flow channels, allowing us to investigate the PCHE performance on a systematic basis of effectiveness and pressure drop between the inlet and outlet of the flow channels. Liquid water is utilized as a working fluid at temperatures of 30°C to 90°C, with geothermal heating rarely targeted for using water from hot springs. The numerical results are validated with experimental data, confirming that the shear stress transport (SST) turbulence model is suited for providing adequate accuracy. This study is intended to delve into several possible designs of PCHE's flow channels to reduce the pressure drop while increasing the effectiveness. Given the PCHE with 13 zigzag flow channels of the bending angle of 150°, the results show that the PCHE with the zigzag flow channels at a mass flow rate of 0.113 kg/s possesses significant heat transfer enhancement. When compared to the other two tested PCHEs (straight flow and serpentine flow passages), a 65% increase in effectiveness and a 39% rise in pressure drop are exhibited. The PCHE can be regarded as a recuperator of the Organic Rankine Cycle (ORC) and is generally thought to be an important part of maximizing the efficiency of the cycle. The favorable features of the zigzag PCHE make it possible to seamlessly integrate the zigzag PCHE into ORC as part of a waste heat recovery system in a feasible way to improve the ORC efficiency.

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“…With recent advancements in brazing and welding technology, most currently manufactured compact heat exchangers (CHX) and plate-fin heat exchangers (PFHX) involve the brazing, semi-welding and all-welding of plates to a core [3]. Diffusion-bonded HXs have also been applied in high-pressure industrial contexts [4].…”

Section: Introductionmentioning

confidence: 99%

“…Another important development in HX manufacturing is the introduction of additive manufacturing (AM), which allows for complex geometries and matrices to be fabricated [5]. As a result, HXs have become more compact and more efficient [4]. For instance, in a study conducted by Wong et al [6], it was concluded that an AM-fabricated lattice-structured HX provided minimal resistance to airflow as compared to traditional plate-fin and pin-fin HXs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers

Rauthan

Guzzomi

Vafadar

et al. 2021

Metals

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Passive heat exchangers (HXs) form an inseparable part of the manufacturing industry as they provide high-efficiency cooling at minimal overhead costs. Along with the aspects of high thermal cooling, it is essential to monitor pressure loss while using plate-fin HXs because pressure loss can introduce additional power costs to a system. In this paper, an experimental study was conducted to look at the effects of dimples on the pressure drop characteristics of single plate-fin heat exchangers. To enable this, different configurations of National Advisory Committee for Aeronautics (NACA) fins with smooth surfaces and 2 mm-diameter dimples, 4 mm-diameter dimples and 6 mm-diameter dimples were designed and 3D printed using fused deposition modelling (FDM) of ABS plastic. The depth to diameter ratio for these dimples was kept constant at 0.3 with varied diameters and depths. These were then tested using a subsonic wind tunnel comprised of inlet and outlet pressure taps as well as a hot wire velocimeter. Measurements were taken for pressure differences as well as average velocity. These were then used to calculate friction factor values and to compare the smooth fin to the dimpled fins in relation to their relative pressure drop performance. It was observed that for lower velocities the 4 mm dimples provided minimum pressure drop, with a difference of 58% when compared to smooth fins. At higher velocities, 6 mm dimples increased the pressure drop by approximately 34% when compared to smooth fins. It can also be concluded from the observed data in this study that shallower dimples produce lower pressure drops compared to deeper dimples when the depth to diameter ratio is kept constant. Accordingly, deeper dimples are more effective in providing drag reduction at lower velocities, whereas shallower dimples are more effective for drag reduction at higher velocities.

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Compact Heat Exchangers in Practice

Cited by 59 publications

References 11 publications

Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

Heat transfer performance comparison of printed circuit heat exchangers with straight, zigzag and serpentine flow channels for waste heat recovery

Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers

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