Experimental study on flow boiling characteristics of pure refrigerant (R134a) and zeotropic mixture (R407C) in a rectangular micro-channel

Dang, Chao; Jia, Li; Xu, Mingchen; Huang, Qian; Qi, Peng

doi:10.1016/j.ijheatmasstransfer.2016.08.067

Cited by 39 publications

(2 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the viscosity increases, it is necessary to consider the additional resistance that the fluid exerts on the shear rate. However, common refrigerants on the market, such as R22, R404A, R407C, R410A, and R134A, are low viscosity fluids with low resistance [16][17][18][19][20]. Therefore, a centrifugal pump that can continuously provide a large flow rate and a constant flow rate with good efficiency should be selected, and a vertical multi-stage pump has the characteristics of high efficiency, low noise, beautiful appearance, small volume, light weight, convenient maintenance, and reliable sealing performance.…”

Section: Selection Of Centrifugal Pumpsmentioning

confidence: 99%

Experimental Study of a Pump-Driven Microchannel-Separated Heat Pipe System

Chen,

Xu,

Shi

et al. 2023

Sustainability

View full text Add to dashboard Cite

The current situation of high energy consumption in data centers places high demands on the energy consumption and heat-dissipation efficiency of cooling technology. This article studies the steady-state flow and heat-transfer characteristics of a pump-driven separated heat pipe system from an experimental perspective. After designing and selecting the pump-driven microchannel-separated heat pipe system, an experimental platform is built to test the pump-driven microchannel-separated heat pipe system under variable operating conditions. It is found that the optimal filling rate range of the system is 75% to 95%, and the optimal condensing air volume is 4250 m3/h. The relationship between the circulating mass flow rate and the heat-transfer capacity of the heat pipe system is comprehensively influenced by the resistance of each section and the heat-transfer coefficient at the heat exchanger. When the indoor and outdoor temperature difference increases from 10 °C to 30 °C, the heat transfer increases by 261.5%, and the working medium of R410a has a better heat-transfer performance than R134A at outdoor temperatures ranging from 0 to 15 °C. The results contribute to the application of pump-assisted microchannel heat pipe systems in data center machines, which provide guidance for the application of cabinet-level thermal management.

show abstract

Section: Selection Of Centrifugal Pumpsmentioning

confidence: 99%

Experimental Study of a Pump-Driven Microchannel-Separated Heat Pipe System

Chen,

Xu,

Shi

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…But taking into account the reasonable operating temperature range of electronic components, zeotropic mixtures of refrigerants have played an important role in the selection of electronic coolants, as far as, can increase the critical heat flux during flow boiling. [3]. Over the past decades, numerous correlations have been developed for calculating heat transfer during flow boiling of a mixture; however, most have been developed based on limited experimental data from one or more research projects.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of flow boiling heat transfer of zeotropic mixture R32/R134a in a microchannel heat exchanger

Shamirzaev

2021

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

This paper presents experimental data on heat transfer of a binary zeotropic mixture of refrigerants R32/R134a in a microchannel heat exchanger with a high specific surface within a range of parameters that is practically important for the development of cooling systems for microelectronics and space technology. The experiments were carried out in a horizontal heat exchanger with one-sided heating of a copper microchannel plate 20x40 mm, containing 21 rectangular microchannels with a cross-section of 335x930 μm, within the range of mass fluxes from 80 to 250 kg/m2s, and at an absolute pressure in the system ranged from 12 to 14 bar. A zeotropic mixture of refrigerants R32/R134a with a molar concentration of the initial mixture of 65%/35% was used as a working fluid. Experimental data were compared with model-based calculations that take into account the influence of changes in the concentrations of components in the liquid and gas phases.

show abstract