The effects of fin height, fin-tube contact thickness and louver length on the performance of a compact fin-and-tube heat exchanger

Javaherdeh, Kourosh; Vaisi, Ahmad; Moosavi, Rouhollah

doi:10.18280/ijht.360307

Cited by 20 publications

(7 citation statements)

References 19 publications

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“…Finally, we observe that at lower values of fin thickness, an increase in fin height has more effect on the efficiency of the heat exchanger. The Same observations were made by Kourosh et al, 2018 in their experimental study of the effects of fin height, fin-tube contact thickness compact of a heat exchanger [14]. The increase in cold air stream inlet temperature has a converging effect on the cold air stream outlet temperature at lower mass flow rates (figure 7c).…”

Section: Effects Of Fin Thicknesssupporting

confidence: 65%

Parametric Analysis of a Plain-Fin Compact Heat Exchanger for a Small-Scale Gas Turbine

Epie

Haşımoğlu²,

Coşkun³

et al. 2020

Sakarya University Journal of Science

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The influence of the thermal parameters of a Plain-Fin Compact Heat Exchanger on its performance is examined in this paper. The objective of this work is to analyse the effect of the different flow and geometric parameters on the output performance of a plain fin compact heat exchanger (PFCHE) designed to be used on a small-scale gas turbine and how these parameters can be used for the optimisation of PFCHEs. In this work, we examined the effects of the variation of input parameters of a plain-fin compact heat exchanger (fin length, fin height, fin thickness, mass flow rate of air and turbine exhaust gas) on the output performance of the heat exchanger (Overall heat exchanger efficiency, fin heat transfer efficiency and the outlet temperatures). The analytical expressions for the outlet temperatures and heat exchanger efficiencies were derived and analysed. Then the derived model was designed and simulated using CFD codes. Also, from the derived expressions, the performance model of the heat exchanger was programmed for analysis. From the results, it shows that the effectiveness (e-value), fin length, fin height and mass flow rates of the gases influence performance of a plain-fin compact heat exchanger. A 50% reduction in fin height can cause as much as an 18% increase in the fin efficiency of the heat exchanger. While a 50% increase in the effectiveness value can cause as much as a 40% increase in the outlet temperature.

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Section: Effects Of Fin Thicknesssupporting

confidence: 65%

Parametric Analysis of a Plain-Fin Compact Heat Exchanger for a Small-Scale Gas Turbine

Epie

Haşımoğlu²,

Coşkun³

et al. 2020

Sakarya University Journal of Science

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“…Nu=0.023Re 0.8 Pr n (7) where n=0.4 for heating and 0.3 for cooling and Nu=hDh/kf. Dh=4A/P, hydraulic diameter where P is the wetted perimeter and kf is the thermal conductivity of the fluid calculated at film temperature.…”

Section: ′′ =Ht (1)mentioning

confidence: 99%

“…On the other hand the fin length has the least impact on the effectiveness compared with other geometric parameters although it has the direct connection with the heat transfer area. Javaherdeh et al [7] investigated the effects of fin height, optimal louver length and fin-louver contact thickness on the amount of heat transfer and pressure drop in a compact heat exchanger in their work. They validated their numerical results using several experimental tests were conducted in a wind tunnel facility, and found a good agreement between the experimental and numerical results.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Effects of the Baffles Added in a Concentric Pipe Heat Exchanger

Pamuk¹

2019

IJHT

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In this numerical work, the effects of baffles added in a Concentric Tube Heat Exchanger are studied, using a commercial software CFD (Computational Fluid Dynamics) package. The CFD model is made to grab all the physical phenomena such as heat transfer rating, temperature, velocity and pressure distributions within the computational domain. First the simplest model, the Heat Exchanger without baffles, is considered. Due to its limited capacity, baffles are added into the domain to investigate the heat transfer enhancement while observing pressure loss that is a direct indication of the pumping power for a given flow rate. A sufficiently high detailed geometry and fine mesh characteristics are adopted taking into account the computation resources and time, yet satisfactory enough to show that the numerical model can be validated using the analytical solutions relying on empirical heat transfer formulas. This gives researches working in Heat Exchanger area the opportunity to design their systems using CFD, without depending on a prototype that needs to be tested before the actual product is marketed. Normally, a new type of heat exchanger with a different tube diameter and baffle lay-out has to be manufactured using general a heat exchanger calculation approach that will most of the time require the revision of the preliminary design.

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“…On the tube side, the percent increase in the heat transfer coefficient is more influential than pressure drop whereas, on the shell side, a pressure drop is more significant. It has been reported by Javaherdeh et al [23] that heat transfer and pressure drop increases as the louver length is increased in louver finned tube heat exchangers due to which more fluid can pass across the fins. They also proposed an optimum louver length to fin height ratio that can further improve the performance.…”

Section: Introductionmentioning

confidence: 95%

Seasonal Performance Investigation for Residential Heat Pump System with Different Outdoor Heat Exchanger Designs

Ishaque

Kim

2019

Energies

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A finned tube heat exchanger is a key component used as a condenser or an evaporator in residential air-conditioning (AC) and heat pump systems. The overall cycle performance of these systems is significantly affected by the heat exchanger’s geometric design. This study investigates outdoor heat exchanger designs with varying geometric parameters such as the fin pitch, number of tube rows, and tube length, and their effect on system performance based on seasonal energy efficiency ratio (SEER) and seasonal coefficient of performance (SCOP). Air face velocity profiles for each operating condition along the outdoor heat exchangers are determined using CFD, with subsequent cycle simulations for 10 different operating conditions. Results have been validated with the available experimental data. The number of tube rows, fin pitch, and length of tube have been varied from 2–10, 1.4–2.5 mm, and 800–2800 mm respectively. The numerical results reveals that SEER increases 3.21% while SCOP increases 5.32% up to fourth and fifth tube row respectively and remain unaffected thereafter. Similarly, SEER increases by 3.55% as the tube length is increased from 800–1800 mm, while it increases only 0.67% for 1800–2800 mm and the maximum variation of 4.32% has been found for SCOP. Moreover, increasing the fin pitch reduces SEER and SCOP (except for fin pitch from 1.4 to 1.8 mm). Finally, the performance of the system with four different fin configurations have also been investigated and it has been found that slit fins are more effective.

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The effects of fin height, fin-tube contact thickness and louver length on the performance of a compact fin-and-tube heat exchanger

Cited by 20 publications

References 19 publications

Parametric Analysis of a Plain-Fin Compact Heat Exchanger for a Small-Scale Gas Turbine

Parametric Analysis of a Plain-Fin Compact Heat Exchanger for a Small-Scale Gas Turbine

Numerical Investigation of the Effects of the Baffles Added in a Concentric Pipe Heat Exchanger

Seasonal Performance Investigation for Residential Heat Pump System with Different Outdoor Heat Exchanger Designs

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