Heat Transfer in Pool Boiling of Ammonia-Water Mixture.

Arima, Hirofumi; Monde, Masanori; Mitsutake, Yuichi; Kawamura, Kouji

doi:10.1299/kikaib.67.2768

Cited by 7 publications

(14 citation statements)

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“…Vapour-liquid equilibrium was calculated Heat transfer coefficients of boiling pure ammonia are similar to that of the boiling pure water and are 10-20 times as high as those of the ordinary organic refrigerants. In the ammonia-water mixture, however, the boiling heat transfer coefficients decrease by a third, at least in pool boiling [26]. In any case, in both gas heat exchangers of Kalina and ORC plant, the global heat transfer coefficient is dominated by the gas-side thermal resistance, and at equal US parameter it is reasonable to expect the same total surface S.…”

Section: Thermodynamic Properties Of the Working Fluidsmentioning

confidence: 95%

Heat recovery from Diesel engines: A thermodynamic comparison between Kalina and ORC cycles

Bombarda¹,

Invernizzi²,

Pietra³

2010

Applied Thermal Engineering

320

116

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To cite this version:Paola Bombarda, Costante Invernizzi, Claudio Pietra. Heat recovery from Diesel engines: a thermodynamic comparison between Kalina and ORC cycles. Applied Thermal Engineering, Elsevier, 2009, 30 (2-3) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Although the obtained useful powers are actually equal in value, the Kalina cycle requires a very high maximum pressure in order to obtain high thermodynamic performances (in our case, 100 bar against about 10 bar for the ORC cycle). So, the adoption of Kalina cycle, at least for low power level and medium-high temperature thermal 2 ACCEPTED MANUSCRIPT sources, seems not to be justified because the gain in performance with respect to a properly optimized ORC is very small and must be obtained with a complicated plant scheme, large surface heat exchangers and particular high pressure resistant and no-corrosion materials. ACCEPTED MANUSCRIPT

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Section: Thermodynamic Properties Of the Working Fluidsmentioning

confidence: 95%

Heat recovery from Diesel engines: A thermodynamic comparison between Kalina and ORC cycles

Bombarda¹,

Invernizzi²,

Pietra³

2010

Applied Thermal Engineering

320

116

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“…Figure 1 shows the selected experimental heat transfer coefficient data plotted against heat flux. As can be seen, data of Inoue et al [1] are slightly higher than the data of Arima et al [2]. This Figure 2 shows the effect of the mass fraction on the heat transfer coefficients, the temperature difference between boiling and dew points, ∆T bp , and the molecular fraction difference between vapor and liquid, (y i -x i ).…”

Section: Introductionmentioning

confidence: 72%

“…The wire was heated using a direct electric current. Arima et al [2] obtained data using an experimental device where the heating surface was a horizontal flat circular surface of silver with a diameter of 10 mm. The flat surface was polished with No.…”

Section: Introductionmentioning

confidence: 99%

Assessment of mixture boiling heat transfer correlations for ammonia/water mixture

Sathyabhama¹,

Babu

2009

Heat Trans. Asian Res.

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The aim of this work is to present a critical examination of both the available experimental data and the performance of the available mixture boiling heat transfer correlations for ammonia/water mixture. First, a selection and comparison of the experimental database found in the open literature at the mentioned working conditions is presented. Subsequently, after a short description of the most relevant heat transfer correlations, and in accordance with the selected data, a detailed analysis of the performance of each correlation is carried out. Results show a small divergence between the experimental data sets and conclude that the presently available correlations show considerable discrepancies in heat transfer coefficients within the selected conditions.

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“…As the mass flux was further decreased to G = 7.5 kg/m 2 s, heat transfer in z =0.95 and z =0.90 was decreased when compared to that in the z = 1.0, however the difference of heat transfer in z =0.95 with that of z = 1.0 was smaller than the difference of heat transfer in z = 0.90 with that of z = 1.0 composition. Arima et al [3] and Inoue et al [4] reported that the pool boiling heat transfer of ammonia/water in the high ammonia composition region was significantly decreased with decreasing the ammonia composition.…”

Section: Local Heat Transfer Coefficientmentioning

confidence: 99%

“…They used the correlation based on a model where the forced convective boiling heat transfer coefficient of the mixture are lower than those of the equivalent pure refrigerant because of the mixing effects of the nucleate boiling and the heat transfer resistance in the vapor phase, finding a good agreement with experimental values. Studies on the relation of the ammonia/water composition with heat transfer include pool boiling heat transfer by Arima et al [3] and Inoue et al [4] , forced convective boiling heat transfer inside vertical circular tubes by Rivera [5] and Khir et al [6] , and forced convective boiling heat transfer inside horizontal circular tubes by Inagaki et al [7] Arima et al [3] performed the experiments on boiling heat transfer of ammonia/water at low (0-27% of ammonia) and high concentrations (50-100% of ammonia) to investigate the effects of the composition on boiling heat transfer. Khir et al [6] presented a correlation of forced convective heat transfer coefficient which agreed well with experimental values in a range of 42-61% ammonia/water mixture, whereas Inagaki et al [7] derived correlations of 0-23% ammonia/water mixture for the forced convective boiling and pseudo-nucleate boiling regions.…”

Section: Introductionmentioning

confidence: 99%

Characteristic of local boiling heat transfer of ammonia and ammonia / water binary mixture on the plate type evaporator

2011

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Power generation using small temperature difference such as ocean thermal energy conversion (OTEC) and discharged thermal energy conversion (DTEC) is expected to be the countermeasures against global warming problem. As ammonia and ammonia/water are used in evaporators for OTEC and DTEC as working fluids, the research of their local boiling heat transfer is important for improvement of the power generation efficiency. Measurements of local boiling heat transfer coefficients were performed for ammonia /water mixture (z = 0.9-1) on a vertical flat plate heat exchanger in a range of mass flux (7.5-15 kg/m 2 s), heat flux (15-23 kW/m 2 ), and pressure (0.7-0.9 MPa). The result shows that in the case of ammonia /water mixture, the local heat transfer coefficients increase with an increase of mass flux and composition of ammonia, and decrease with an increase of heat flux．

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Heat Transfer in Pool Boiling of Ammonia-Water Mixture.

Cited by 7 publications

References 0 publications

Heat recovery from Diesel engines: A thermodynamic comparison between Kalina and ORC cycles

Heat recovery from Diesel engines: A thermodynamic comparison between Kalina and ORC cycles

Assessment of mixture boiling heat transfer correlations for ammonia/water mixture

Characteristic of local boiling heat transfer of ammonia and ammonia / water binary mixture on the plate type evaporator

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