Performance of heat pumps using pure and mixed refrigerants with maldistribution effects in plate heat exchanger evaporators

Mancini, R. C.; Zühlsdorf, Benjamin; Aute, Vikrant; Markussen, Wiebke Brix; Elmegaard, Brian

doi:10.1016/j.ijrefrig.2019.05.023

Cited by 12 publications

(4 citation statements)

References 35 publications

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“…The PHE design in this industry has the limitation that the allowed pressure drop value is in the range of 30-35 kPa. This limit is also applied by [17], [25]. Therefore, the ∆P p value obtained on the cooler side of the PHE has the highest value and exceeds the maximum limit.…”

Section: Resultsmentioning

confidence: 98%

Optimizing Plate Heat Exchanger Design for Steam Condensate Recovery Systems

Malik,

Sari

2024

Reka Buana

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Condensate water is typically generated as a by-product during the use of steam as a medium for heat transfer. In order to optimize the transfer area, the chemical industry often employs heat exchangers, such as the plate heat exchanger (PHE), which provides flexibility in adjusting the space area for heat transfer. This case study examines the optimization of plate geometry dimensions to enhance the heat transfer process of PHE equipment design. The optimization process involves mathematical equations and a literature review of the design of this type of heat exchanger. Improving the dimensional aspect of the plate geometry results in an increase in the overall heat transfer coefficient (U) and a reduction in the number of design requirements used. The study's estimation results suggest that the PHE design has a limitation on plate dimensions, which should be less than 0.3×0.6 m. Additionally, it is important to consider the pressure drop value, which should not exceed 29.07 kPa. A review of the chemical industry field provided estimated options for plate size and quantity, both of which support the optimization of heat transfer rate and design constraint thresholds. The implementation of the design has been found to enhance the performance of the planning process for recovering steam condensate water.

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Section: Resultsmentioning

confidence: 98%

Optimizing Plate Heat Exchanger Design for Steam Condensate Recovery Systems

Malik,

Sari

2024

Reka Buana

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“…Numerically and practically, spaced finned rotating and orbicular tube bundle exchangers were explored in [9] to show the simplification of previously discovered optimized design combinations for highest heat transfer rate under a constant volume limitation. In the research lab, two air conditioning systems with extended surfaces ellipsoidal and slightly curved tubes have been built, and six test runs had been performed in a split air conditioner using turbulent forced convection.…”

Section: Literature Reviewmentioning

confidence: 99%

CFD Assessment of Flow Maldistribution in Plate Fin and Tube Heat Exchangers

Yadav¹,

Badgaiyan²,

Singh³

2022

IJOSCIENCE

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The primary goal of this work is to use CFD assessment simulating framework is to anticipate the impact of injecting air flowing mal-distribution on heat exchanger architecture and thermal flow characteristics. Using CFD (computational fluid dynamics) simulation-studies, determine the impact of air intake flow unequal distribution or mal-distribution on the complete redesign as well as high - temperature hydraulic performing ability of HEX (heat exchangers). The findings demonstrate that a plate as well as tube fin heating element consisting of an elongated tubular setup slanted by 30 degrees can achieve the highest temperature transmission, having a heat transfer ability of 23.22 percent greater than a (SPHEX) spherical pipe heat exchanger.

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“…Massuchetto LHP et al conducted tests on three different refrigerant combinations (R744/R1270, R744/R717, and R744/RE170), determining that R744/RE170 yielded the optimal refrigeration outcome [12]. Mancini et al explored the use of CO 2 and dimethyl ether as an azeotropic combination refrigerant, finding that the addition of dimethyl ether benefited the CO 2 system [13]. Adding propane to CO 2 refrigerant was also found to enhance the system's coefficient of performance by 7-9% according to the study by W. I. Mazyan et al [14].…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis on Zeotropic Refrigerants R-455A and R-463A as Alternatives for R-744 in Automotive Air-Conditioning System (AACs)

Alzahrani

2023

Processes

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The popularity of vehicles and the increased time spent in cars with air conditioning systems has led to regulations in many countries that require the use of environmentally friendly refrigerants with minimal global warming and zero ozone depletion potential (GWP and ODP). Cars need high-performance, eco-friendly air conditioning systems to reduce their impact on the environment, lower fuel consumption, and decrease carbon emissions. The aim of the current work was to propose CO2-based blend zeotropic refrigerants, R-455A (R-744/32/1234yf) and R-463A (R-744/32/125/1234yf/134a), to improve the thermodynamic performance of pure CO2 refrigerants. The thermodynamic energy and exergy analysis and system optimization of an AAC system for the new zeotropic refrigerant blends compared to carbon dioxide (R-744), using Aspen HYSYS software, were investigated. The influence of cooler/condenser pressure, average evaporator temperature, cooler/condenser outlet temperature, and refrigerant flow rate on the cycles’ COP and exergy efficiency were conducted and are presented. The results showed that, at the same operating condition parameters, the cycle COP improved by 57.6 and 76.5% when using R455A and R463A instated of R744, respectively, with the advantage of reducing leakage problems due to the higher operating pressure of R744 (5–7 times higher than those of R455A and R463A), as well as requiring heavy equipment, but at optimal operating condition parameters, R744 and R-463A had a maximum COP of 14.58 and 14.19, respectively. The maximum COPs of R744, R455A, and R463A based on the optimal pressure of the cooler/condenser were 3.1, 4.25, and 5.4, respectively. Additionally, regarding the need for environmentally friendly air conditioning systems with acceptable performance in cars due to their impact on the environment and their contribution to global warming, the blend R455A is recommended for use as a refrigerant in AAC systems.

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Performance of heat pumps using pure and mixed refrigerants with maldistribution effects in plate heat exchanger evaporators

Cited by 12 publications

References 35 publications

Optimizing Plate Heat Exchanger Design for Steam Condensate Recovery Systems

Optimizing Plate Heat Exchanger Design for Steam Condensate Recovery Systems

CFD Assessment of Flow Maldistribution in Plate Fin and Tube Heat Exchangers

Energy and Exergy Analysis on Zeotropic Refrigerants R-455A and R-463A as Alternatives for R-744 in Automotive Air-Conditioning System (AACs)

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