Flat tube heat exchangers – Direct and indirect noise levels in heat pump applications

Gustafsson, Ola; Hellgren, Henrik; Stignor, Caroline Haglund; Axell, Monica; Larsson, Krister; Teuillieres, Cedric

doi:10.1016/j.applthermaleng.2014.02.002

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…Compared to round tube HE, flat tube HE has better air-side heat transfer coefficient and lower pressure drop due to small wake area behind the tubes [15]. Moreover, noise and vibration levels in flat tubes are expected to be lower than that of circular tubes [16,17]. The performance of compact HE can be affected by many geometrical and processing factors.…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Adam¹,

Oumer²,

Alias³

et al. 2022

Int. J. Automot. Mech. Eng.

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The performance of compact fin-and-flat tube heat exchangers (HE) can be affected by many geometrical and processing factors and one of them is tube inclination angle. However, the effect of flat tube inclination angle on the thermal-hydraulic performance of the HE is not fully examined. This paper investigates the effects of flat tube inclination angles on heat transfer and pressure drop characteristics of fined flat tube HE when the tubes are deployed in in-line and staggered arrangements. A symmetric numerical method based on FLUENT software was carried out with six different tube inclination angles (0°, 30°, 60°, 90°, 120°, and 150°) in moderately high Reynolds number. From the results, it was observed that heat transfer coefficient increased with the augmentation of the tube inclination angle from 0 o to 90 o and decreased for 120 o and 150 o . With the increase of tube inclination angle, the average Nusselt number rose by 36.3%. This might be due to the reason that the tube surface area increases with the inclination angle, which also results in the largest increment of the pressure drop by 42.0%. Overall, the 90 o tube inclination angle showed the highest enhancement in heat transfer for both inline and staggered configurations with a maximum enhancement of 41.2% for in-line and 32.2% for staggered arrangements. However, the heat transfer enhancements were accompanied by high-pressure drop penalties of up to 44.2% and 42.6% for in-line and staggered arrangements, respectively. Therefore, inclining the tubes at 90 o is recommended where high heat transfer is required. On the other hand, 0 o tube inclination angle is recommended where pumping power is a crucial issue.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Adam¹,

Oumer²,

Alias³

et al. 2022

Int. J. Automot. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…and third, on the receiver side, the noise-sensitive people should wear earmuffs and other labor protection measures to indirectly prevent and control noise [13,14]. In the current study, the second noise reduction method is adopted.…”

Section: Overall Noise Reduction Schemementioning

confidence: 99%

Research on Noise Reduction Scheme of Heat Pump Unit in a Square

Zhang

Geng³

et al. 2020

Journal of Chemistry

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Heat pump unit is a host device located in the central air-conditioning terminal, providing cold and hot water. Heat pump unit has the advantages of energy saving, environmental protection, easy maintenance, and so on. It is adopted to solve the problems of refrigeration and heating in ventilation and air conditioning from many engineering projects in China. When the equipment is turned on, however, the high noise generated by the heat pump unit has a very negative impact on the life and work of the surrounding residents. Therefore, noise reduction is needed to improve the environment quality. In this paper, the noise of the air-cooled heat pump unit of the square area in Shanghai was detected, the noise source was analyzed, and the corresponding noise reduction scheme was proposed. After the completion of the scheme, measurements indicate that A-weighted sound pressure level is less than or equal to 60 dB (A) during the day and less than or equal to 50 dB (A) at night, which meets the relevant national noise limit emission standards and conforms to the second-class quality standard of the acoustic environment.

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The noise spectral characteristics and noise reduction schemes of screw air-source heat pump: A case study

Liu,

Feng,

Jia

et al. 2023

Build. Simul.

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Flat tube heat exchangers – Direct and indirect noise levels in heat pump applications

Cited by 8 publications

References 7 publications

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Research on Noise Reduction Scheme of Heat Pump Unit in a Square

The noise spectral characteristics and noise reduction schemes of screw air-source heat pump: A case study

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