Heat transfer and pressure drop of supercritical CO2 in brazed plate heat exchangers of the tri-partite gas cooler

Zendehboudi, Alireza; Ye, Zuliang; Hafner, Armin; Andresen, Trond; Skaugen, Geir

doi:10.1016/j.ijheatmasstransfer.2021.121641

Cited by 32 publications

(9 citation statements)

References 60 publications

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“…On the other hand, the hot stream input enthalpy was computed based on the semi-hermetic reciprocating compressor model, manufactured by the Dorin company (Dorin CD1400H) [ 17 ]. Moreover, a linear temperature profile is assumed between both streams to estimate the thermophysical properties on the surface between the hot and cold fluids [ 6 ]. The thermophysical properties were calculated based on the NIST database for real gases [ 14 ].…”

Section: System Descriptionmentioning

confidence: 99%

“…As shown in Equation (1), the heat rates of R744 and the cold fluid were assumed to be identical, and this assumption was proved experimentally by Zendehboudi et al [ 6 ].

where

and

correspond to the cold stream outlet and inlet enthalpies, respectively.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…R744 (denoted as CO 2 ) has been used widely in the refrigeration system due to its good thermophysical properties and is classified as A1 safety level by ASHRAE [ 5 ]. Moreover, the utilization of supercritical R744 overwhelmed the inefficiency problems in refrigeration cycles at high temperatures since it has a low critical temperature [ 6 ]. The low critical temperature anticipates smooth variation in the thermophysical properties, resulting in a stable operation of the PHE.…”

Section: Introductionmentioning

confidence: 99%

“…In literature, most studies concerned with R744 were performed for channel or tube heat exchangers [ 7 ]. Recently, Zendehboudi et al [ 6 ] examined the heat transfer coefficients and pressure drop of supercritical R744 experimentally inside PHE. The authors claimed that the mathematical models proposed in the literature for Nusselt number are unapplicable for their study since these models are intended for heat transfer inside a channel or tube.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers

Elbarghthi

Hdaib

Dvořák

2022

Entropy

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Plate heat exchangers (PHE) are used for a wide range of applications, thus utilizing new and unique heat sources is of crucial importance. R744 has a low critical temperature, which makes its thermophysical properties variation smoother than other supercritical fluids. As a result, it can be used as a reliable hot stream for PHE, particularly at high temperatures. The local design approach was constructed via MATLAB integrated with the NIST database for real gases. Recently produced HFOs (R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E)) were utilized as cold fluids flowing through three phases: Liquid-phase, two-phase, and gas-phase. A two-step study was performed to examine the following parameters: Heat transfer coefficients, pressure drop, and effectiveness. In the first step, these parameters were analyzed with a variable number of plates to determine a suitable number for the next step. Then, the effects of hot stream pressure and cold stream superheating difference were investigated with variable cold channel mass fluxes. For the first step, the results showed insignificant differences in the investigated parameters for the number of plates higher than 40. Meanwhile, the second step showed that increasing the hot stream pressure from 10 to 12 MPa enhanced the two-phase convection coefficients by 17%, 23%, 75%, and 50% for R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E), respectively. In contrast, increasing the cold stream superheating temperature difference from 5 K to 20 reduced the two-phase convection coefficients by 14%, 16%, 53%, and 26% for R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E), respectively. Therefore, the R744 is suitable for PHE as a driving heat source, particularly at higher R744 inlet pressure and low cold stream superheating difference.

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Section: System Descriptionmentioning

confidence: 99%

“…As shown in Equation (1), the heat rates of R744 and the cold fluid were assumed to be identical, and this assumption was proved experimentally by Zendehboudi et al [ 6 ].

where

and

correspond to the cold stream outlet and inlet enthalpies, respectively.…”

Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers

Elbarghthi

Hdaib

Dvořák

2022

Entropy

View full text Add to dashboard Cite

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“…Cai et al [4] proposed a microtube heat exchanger for the heat transfer between supercritical CO 2 and water. Zendehboudi et al [5] investigated the heat transfer characteristics of a brazed plate heat exchanger for supercritical CO 2 and water. Du et al [6] conducted a size optimization study for the heat exchanger which was applied in a marine supercritical CO 2 Brayton cycle.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Plate-Fin Heat Exchanger in a Gas Turbine and Supercritical Carbon Dioxide Combined Cycle with Thermal Oil Loop

et al. 2021

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This paper presents an investigation on the optimum design for a plate-fin heat exchanger (PFHE) of a gas and supercritical carbon dioxide combined cycle which uses thermal oil as intermediate heat-transfer fluid. This may promote the heat transfer from low heat-flux exhaust to a high heat-flux supercritical carbon dioxide stream. The number of fin layers, plate width and geometrical parameters of fins on both sides of PFHE are selected as variables to be optimized by a non-dominated sorting genetic algorithm-II (NSGA-II), which is a multi-objective genetic algorithm. For the confliction of heat transfer area and pressure drop on the exhaust side, which are the objective indexes, the result of NSGA-II is a Pareto frontier. The technique for order of preference by similarity to ideal solution (TOPSIS) approach is applied to choose the optimum solution from the Pareto frontier. Finally, further simulation is performed to analyze the effect of each parameter to objective indexes and confirm the rationality of optimization results.

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