Heat and flow investigation of NOVEC649 refrigerant condensation in pipe minichannels

Sikora, Małgorzata; Bohdal, T.

doi:10.1016/j.energy.2020.118447

Cited by 8 publications

(10 citation statements)

References 24 publications

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“…As shown in Figure 11, the 80% measurement results obtained during the in a minichannel with an internal diameter of di = 1.2 mm. As observed, the highest heat transfer coefficient and the lowest pressure drop in the same conditions have HFE7100, which gives it an advantage over the other two refrigerants (HFE7000 and Novec649) [24]. The results of the experimental investigation were compared with the results of calculations according to the correlations of various authors such as the following: Shah et al [25], Thome et al [26], Tang [27], Bandhauer [28], Cavallini et al [29], Rahman-Kariya-Miyara et al [10], Friedel [30], Chen et al [31], Garimella et al [32], Del Col et al [33] and Mikielewicz et al [9].…”

Section: Experimental Results Of Investigationssupporting

confidence: 54%

“…Figure 13 presents a comparison of our own research results on three low-pressure refrigerant condensations in a minichannel with an internal diameter of d i = 1.2 mm. As observed, the highest heat transfer coefficient and the lowest pressure drop in the same conditions have HFE7100, which gives it an advantage over the other two refrigerants (HFE7000 and Novec649) [24]. in a minichannel with an internal diameter of di = 1.2 mm.…”

Section: Experimental Results Of Investigationssupporting

confidence: 52%

“…Bendhauer Cavallini Table 2. Comparison of heat transfer investigation results with the results of calculations according to the correlations of various authors [10,[21][22][23][24][25].…”

Section: Shah Thomementioning

confidence: 99%

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Experimental Study of HFE 7000 Refrigerant Condensation in Horizontal Pipe Minichannels

2021

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This article presents the results obtained from our own experimental investigations on heat exchange and pressure drop during the condensation flow of the HFE 7000 refrigerant in pipe minichannels with an internal diameter of di = 1.2–2.5 mm. The influence of vapor quality x and the mass flux density G on the two-phase flow pressure drops and heat transfer is presented. The tests were performed for the mass flux density range of G = 110–4700 kg/m2s, saturation inlet temperature of Ts = 36–43 °C and heat flux density of q = 1 ÷ 20 kW/m2. The pressure drop characteristics and heat transfer coefficient as a function of the internal diameter of minichannels are illustrated. The results of experimental research on the heat transfer coefficient and two-phase pressure drop are compared with correlations developed by other authors. The best accuracy has a comparison of experimental study with correlation of Rahman-Kariya-Miyara et al. and Mikielewicz et al.

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Section: Experimental Results Of Investigationssupporting

confidence: 54%

Section: Experimental Results Of Investigationssupporting

confidence: 52%

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Experimental Study of HFE 7000 Refrigerant Condensation in Horizontal Pipe Minichannels

2021

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“…The term "image analysis" refers to the automatic processing and analysis of images of selected objects or surroundings, and the primary objective is to obtain useful mathematical information that can be used for their interpretation that may further affect the The visualization tests were performed in the glass minichannels (Figure 3). The channels with diameter d h = 2 mm, 1.2 mm, 0.8 mm, and 0.5 mm and a length of 250 mm were selected for the studies [27][28][29]. The flow structures formed during the condensation of HFE7000, HFE7100, and Novec649 refrigerants in the minichannels were visualized by recording videos using a slow-motion camera.…”

Section: Image Analysismentioning

confidence: 99%

Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels

Sikora

2021

Materials

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This article presents the results of flow visualization studies of Novec refrigerants during condensation in minichannels. Experimental investigation of two-phase flow regimes was conducted in minichannels with internal diameter dh = 2.5, 2.0, 1.2, and 0.5 mm. Images of the two-phase flow structures were analyzed by using the MATLAB algorithm. To calculate void fraction, a two-dimensional areal quantitative stereology technique was used. Observation of flow structures formed during the process of condensation was the major aim of the investigations. The condensation studies were conducted over a wide range of mass flux densities (G = 80–5500 kg/m2s) and saturation temperatures (ts = 30–70 °C). Visualization results and image analysis methods are described in this paper. Based on the experimental results, a flow structure map was constructed and presented.

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“…The piping system on the nitrogen compressor shows that there is possibility backflow to the standby equipment [3][4]. Besides, the phenomenon of turbulence in pipe flow caused by boundary condition on pipe-wall and also appears confluence of two flows and the influence of flow velocity [5][6][7][8][9][10][11][12]. The pressure on the backflow flow is very high, and it will cause nitrogen gas leading to standby equipment being condensate [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Compressor Piping Design Effect on Vibration Data

Suryadi

Yanuar

Gunawan

2021

ARFMTS

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One of the systems for oil and gas production supports is the nitrogen compression system. Problem found that condition of the compressor has high vibration with the maximum overall the first compressor is 9,813 mm / s RMS, the second compressor is 7,439 mm / s RMS, the third compressor is 7,430 mm / s RMS, the fourth compressor is 13.47 mm / s RMS, the fifth compressor is 13,220 mm / s RMS, and sixth compressor already damaged. This research will discuss the nitrogen compression process in terms of the characteristics of the output fluid flow from the compressor using computational fluid dynamics. The first piping system shows that the standby compressor's flow has a higher pressure reaching 10.72 - 11.82 Pa but it is still acceptable. The second piping system with two compressors in operation shows that the pipeline flows in the opposite direction with high pressure. Flow turbulence occurs, resulting in a higher speed. The highest pressure in the pipeline reaches 44.79 Pa, mostly at the fifth and sixth compressors. The conclusion from this research there is high pressure backflow when one compressor stops and another compressor start running. Prevents direct pressure to the compressor or the condensed fluid from the gas flowing and entering the compressor used valve addition.

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Heat and flow investigation of NOVEC649 refrigerant condensation in pipe minichannels

Cited by 8 publications

References 24 publications

Experimental Study of HFE 7000 Refrigerant Condensation in Horizontal Pipe Minichannels

Experimental Study of HFE 7000 Refrigerant Condensation in Horizontal Pipe Minichannels

Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels

Compressor Piping Design Effect on Vibration Data

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