Condensation of steam mixed with non-condensable gas on vertical heat exchanger tubes in circumstances with free convection

Kang, Jinhoon; Kim, Huiyung; Bak, JinYeong; Lim, Sang-Gyu; Yun, Byong-Jo

doi:10.1016/j.ijheatmasstransfer.2021.120925

Cited by 27 publications

(5 citation statements)

References 23 publications

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“…(5) Water vapor in the flue gas only condenses on the tube wall, not in the flue gas stream. (6) The thickness of condensate film is considered to be zero and the heat and mass transfer resistance of this film is ignored. (7) Secondary evaporation of the condensate water in the heat exchanger is also neglected.…”

Section: Flue Gas Inlet Flue Gas Outlet a Unit Of Heat Transfermentioning

confidence: 99%

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A Thermal Calculation Model for Tubular Condensing Heat Exchanger

Han,

Yang,

Yang

et al. 2023

Preprint

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The condensing heat exchanger is commonly applied in various heat exchange systems. It can efficiently recover moisture and heat from the flue gas that contains water vapor. However, the convective-condensation heat transfer process is so complicated that no mature thermal calculation model is available. This study develops a thermal calculation model for the widely employed tubular condensing heat exchanger in industry. To characterize the degree of the heat and mass transfer, this study introduces two parameters, namely the sensible and latent heat transfer efficiencies of fin. The thermal calculations are conducted for the condensing heat exchangers reported in the literature to verify the proposed model by comparing it with the experimental data. The results show that the absolute error of the calculated sensible and latent heat transfer efficiencies is 0.0365 and 0.0268, respectively. Under the working conditions in this study, a maximum difference of 5.2 K has been acquired between the measured and calculated values of the outlet temperature. The relative error of the condensate water flowrate is mostly within ±5.0% and ±10.0% under the bare-tube and finned-tube conditions, respectively, with a maximum deviation of 0.7 and 1.4 kg h-1. This study provides a general model for designing and optimizing various tubular condensing heat exchangers accurately.

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Section: Flue Gas Inlet Flue Gas Outlet a Unit Of Heat Transfermentioning

confidence: 99%

“…Condensation is a common phenomenon that happens in nature and human life. The water vapor condensation mainly includes the convective-condensation of the pure steam [5], the water vapor with a little non-condensable gas (NCG) [6], the high-moisture flue gas [7], and so on.…”

Section: Introductionmentioning

confidence: 99%

A Thermal Calculation Model for Tubular Condensing Heat Exchanger

Han,

Yang,

Yang

et al. 2023

Preprint

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“…This often leads to increased thermal and flow resistance on the air-side and decreased heat exchange effect. Kang et al (2021) researched the e-vehicle AC system to explore the influence of inlet air temperature on the heat transfer characteristics of the MTHE evaporator. The experiment revealed that the evaporator loss was smallest and the largest under an inlet air temperature of 42 • C and 27 • C [31].…”

Section: Effect Of Surface Condensation On Exchangermentioning

confidence: 99%

“…Kang et al (2021) researched the e-vehicle AC system to explore the influence of inlet air temperature on the heat transfer characteristics of the MTHE evaporator. The experiment revealed that the evaporator loss was smallest and the largest under an inlet air temperature of 42 • C and 27 • C [31]. Reda et al (2021) numerically simulated the airside flow and heat transfer characteristics of MTHE.…”

Section: Effect Of Surface Condensation On Exchangermentioning

confidence: 99%

Review on the Application of Machine Vision in Defrosting and Decondensation on the Surface of Heat Exchanger

et al. 2022

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Under low outdoor temperature and high humidity, frost easily forms on the Heat Exchanger (Exchanger) surface on the outdoor side. The formation and growth of this frost layer will seriously impact the Exchanger’s heat extraction process and the system’s energy efficiency, triggering malfunction in the compressor. To this end, this work first analyzes the formation and growth mechanism of Exchanger surface frosting and condensation. It then summarizes the current research status of Machine Vision (MV) technology in defrosting and decondensation. Further, it previews the follow-up research direction. The experimental findings show that MV technology can automatically observe frost and dew, guaranteeing a real-time understanding of the frost layer. Directly obtaining the frost and dew information from the image can significantly save human resources and improve efficiency.

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“…Ji et al [2] Stephan and Preußer [41] 59.5 91. 5 Bohdal and Kruzel [42] 57.4 Shekriladze and Gomelauri [46] Kutateładze [44] Fujii and Oda [45] 32.9 91.7 39.1…”

Section: Author Mape [%]mentioning

confidence: 99%

External Condensation of HFE 7000 and HFE 7100 Refrigerants in Shell and Tube Heat Exchangers

2021

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The paper describes the results of experimental studies of media as an intermediary in heat exchange taking place in low volume conditions. Their properties predestine them both as a future-proof for transporting and storing heat materials. The paper concerns the current topic related to the miniaturization of cooling heat exchangers. There are many studies in the literature on the phase transition of refrigerants in the flow in pipe minichannels. However, there is a lack of studies devoted to the condensation process in a small volume on the surface of pipe minichannels. The authors proposed a design of a small heat exchanger with a shell-and-tube structure, where the refrigerant condenses on the outer surface of the pipe minichannels cooled from the inside with water. It is a response to the global trend of building highly efficient, miniaturized structures for cooling and air conditioning heat exchangers. Two future-proof, ecological replacements of the CFC refrigerants still present in the installations were used for the experimental research. These are low-pressure fluids HFE 7000 and HFE 7100. The tests were carried out in a wide range of changes in thermal-flow parameters: G = 20–700 kg·m−2s−1, q = 3000–60,000 W·m−2, ts = 40–80 °C.

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Condensation of steam mixed with non-condensable gas on vertical heat exchanger tubes in circumstances with free convection

Cited by 27 publications

References 23 publications

A Thermal Calculation Model for Tubular Condensing Heat Exchanger

A Thermal Calculation Model for Tubular Condensing Heat Exchanger

Review on the Application of Machine Vision in Defrosting and Decondensation on the Surface of Heat Exchanger

External Condensation of HFE 7000 and HFE 7100 Refrigerants in Shell and Tube Heat Exchangers

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