Performance comparison of tube and plate-fin circular and elliptic heat exchangers for HVAC-R systems

Matos, R. S.; Vargas, José Viriato Coelho; Rossetim, M.A.; Pereira, Marcus Vinicius Alves; Pitz, Diogo B.; Ordóñez, Juan C.

doi:10.1016/j.applthermaleng.2020.116288

Cited by 9 publications

(4 citation statements)

References 40 publications

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“…Heat transfer correlations are determined on the side of the flowing gas, which is usually air, in a wide range of Reynolds number variations [5]. Additionally, the effectiveness of various types of improvements in the design of heat exchangers, such as oval tubes [6], new fin shapes, or guide vanes forming the air flow in the exchanger [5], is usually evaluated experimentally. Despite the high reliability of the obtained results, a disadvantage is the cost of experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers

Marcinkowski

Taler

et al. 2021

Energies

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Currently, when designing plate-fin and tube heat exchangers, only the average value of the heat transfer coefficient (HTC) is considered. However, each row of the heat exchanger (HEX) has different hydraulic–thermal characteristics. When the air velocity upstream of the HEX is lower than approximately 3 m/s, the exchanged heat flow rates at the first rows of tubes are higher than the average value for the entire HEX. The heat flow rate transferred in the first rows of tubes can reach up to 65% of the heat output of the entire exchanger. This article presents the method of determination of the individual correlations for the air-side Nusselt numbers on each row of tubes for a four-row finned HEX with continuous flat fins and round tubes in a staggered tube layout. The method was built based on CFD modelling using the numerical model of the designed HEX. Mass average temperatures for each row were simulated for over a dozen different airflow velocities from 0.3 m/s to 2.5 m/s. The correlations for the air-side Nusselt number on individual rows of tubes were determined using the least-squares method with a 95% confidence interval. The obtained correlations for the air-side Nusselt number on individual rows of tubes will enable the selection of the optimum number of tube rows for a given heat output of the HEX. The investment costs of the HEX can be reduced by decreasing the tube row number. Moreover, the operating costs of the HEX can also be lowered, as the air pressure losses on the HEX will be lower, which in turn enables the reduction in the air fan power.

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Section: Introductionmentioning

confidence: 99%

Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers

Marcinkowski

Taler

et al. 2021

Energies

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“…There are quite a number of heat exchangers (HE) utilized in industries in this century, and they are chosen based on their uses [1]. Fin and tube heat exchangers are examples of small heat exchangers that are frequently utilized in industries like for heating, ventilation, and air conditioning (HVAC) systems [2,3], naval and aerospace purposes [4], and also petrochemical industries [5]. Finned heat pipe and cooling pipe surrounding by fibers or porous media are also used to enhance heat transfer performance of air conditioning system [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on The Performance of One-Directional and Bi-Directional Flow Conditions Across In-Line Tube Banks Heat Exchanger

Hasbullah

Saat

Anuar

et al. 2022

ARFMTS

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The one-directional flow condition and the bi-directional flow condition are two flow conditions that can be found in many energy systems depending on the nature of the flow and the working mechanism of the system. This paper reports the differences in heat transfer performance for an in-line tube banks heat exchanger that is placed in the one-directional and the bi-directional flow conditions. The experiments involve the use of a blower as a flow inducer for one-directional flow while a loudspeaker with a constant frequency of 14.2 Hz is used as a flow inducer for bi-directional flow condition. A quarter wavelength resonator with 4 mm wall thickness and a length of 6600 mm was used in the investigation. The results of velocity and temperature were recorded using a hotwire anemometer and a type-K thermocouple, respectively. Results show that the behaviour of velocity and temperature in one-directional and the bi-directional flow conditions over an in-line heated tube banks are different with a maximum difference of 52 % for velocity and 79 % for temperature.

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“…In addition, the geometric investigation for different operating conditions is essential to guide the initial stages of equipment projects and define their designs. Thus, the studies related to convective flows around elliptical bodies have been developed continuously over time [25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

A constructal approach applied to the cooling of semi-elliptical blocks assembled into a rectangular channel under forced convection

Razera

Fonseca

Isoldi

et al. 2022

International Journal of Heat and Mass Transfer

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Performance comparison of tube and plate-fin circular and elliptic heat exchangers for HVAC-R systems

Cited by 9 publications

References 40 publications

Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers

Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers

Experimental Study on The Performance of One-Directional and Bi-Directional Flow Conditions Across In-Line Tube Banks Heat Exchanger

A constructal approach applied to the cooling of semi-elliptical blocks assembled into a rectangular channel under forced convection

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