Performance enhancement of vapor recompression heat pump

Waheed, M.A.; Oni, A.O.; Adejuyigbe, Samuel B.; Adewumi, B. A.; Fadare, D. A.

doi:10.1016/j.apenergy.2013.09.024

Cited by 114 publications

(45 citation statements)

References 33 publications

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“…Due to its excellent characters of simple process, high-purity products and good reliability, distillation has been widely used in the fields of chemical, petroleum, and environmental protection, etc. However, it has one stark drawback, i.e., considerable energy consuming-40-70% of energy consumption was used in the separation process of petrochemical industry, and the distillation unit operation accounts for 95%, nearly 3% of the world's total energy consumption [1][2][3]. With the worsening energy shortage situation and increasing energy demand in the world, process intensification technology is becoming more important in the chemical process development [4].…”

Section: Introductionmentioning

confidence: 99%

Simulation and optimization of different pressure thermally coupled distillation for separating a close-boiling mixture of n-butanol and iso-butanol

et al. 2017

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Substantial quantities of energy are required in conventional distillation columns applied in high-purity separation of close-boiling mixtures. To achieve energy saving of distillation, a novel different pressure thermally coupled distillation (DPTCD) was proposed for separating the close-boiling mixture of n-butanol and iso-butanol. Both this intensified energy integration technique and two other processes, namely conventional distillation (CD) and vapor recompression column (VRC), were simulated in process simulator Aspen Plus. The optimization was carried out to determine the optimal values of design and operating variables on the basis of minimizing energy consumption. Subsequently, the energy saving and economic efficiency of the DPTCD scheme were evaluated through the comparison with the other two processes. The results showed that, compared to the CD and VRC processes, the energy consumption of DPTCD process was decreased by 65.21 and 15.79%, respectively, and the total annual cost (TAC) of DPTCD process can be reduced by 33.75 and 10.46%. It demonstrated that DPTCD scheme was the most promising alternative to reduce the total energy consumption and TAC with high purity (99.1 wt%) n-butanol and iso-butanol products among these separation processes.

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Section: Introductionmentioning

confidence: 99%

Simulation and optimization of different pressure thermally coupled distillation for separating a close-boiling mixture of n-butanol and iso-butanol

et al. 2017

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“…This is probably its main draw back. Various technologies such as heat pump assisted distillation [3][4][5], distillation with vapor recompression [6][7][8][9], distillation with bottom flashing [10,11] and internally heat integrated distillation columns (i-HIDiC) [12][13][14][15][16][17] have been developed previously for reducing energy requirements of distillation systems. Simplified process flow diagrams of bottom flashing heat pump is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Various configurations of these systems have been presented in previous studies [7,8,18,[20][21][22][23][24][25]. These configurations include: vapor recompression with intermediate reboiler(s) [20,26,27], vapor recompression with self-heat recuperation [28], vapor recompression with extra heat transfer units [7], vapor recompression and bottom flashing on petlyuk column [8], simplified heat integrated distillation column [25], heat integrated distillation with additional heat transfer between top product and feed [12] and heat integrated distillation columns for separating ternary mixtures [14].…”

Section: Introductionmentioning

confidence: 99%

“…These configurations include: vapor recompression with intermediate reboiler(s) [20,26,27], vapor recompression with self-heat recuperation [28], vapor recompression with extra heat transfer units [7], vapor recompression and bottom flashing on petlyuk column [8], simplified heat integrated distillation column [25], heat integrated distillation with additional heat transfer between top product and feed [12] and heat integrated distillation columns for separating ternary mixtures [14]. Current trends of using process intensification principles, along various optimization techniques for simultaneous control and design for improving performance of distillation systems were studied in a recent paper [29].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a novel configuration of bottom flashing on dual distillation columns for saving energy

et al. 2017

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Vapor recompression and bottom flashing are among the developed technologies for enhancing energy efficiency of distillation processes. In this paper, a novel configuration of bottom flashing system is proposed for enhancing energy efficiency of dual columns such as direct distillation sequences. The system is designed to operate between two distillation columns. The proposed system engages two separate distillation columns, both of which can be wide boiling systems. The system incorporates two interacting bottom flashing systems that engage the two distillation columns through heat transfer from the top product of the second column to the bottom product of the first column which in turn results in elimination/reduction of utility requirements of condenser of the second column along with reboiler of the first column. Based on the results of this study, compared to conventional direct sequence distillation, 40.3% reduction in energy requirements and 20.7% reduction total annual costs of the process can be obtained through application of the proposed system.

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“…The results showed that the developed models yielded considerable energy savings. Considering the present trend for short process modification payback time, the use of an external process stream is recommended to boost plant performance (Waheed et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Determining the Working Conditions of Heat Pump Components According to Running Modes

Çakır¹,

Çomaklı²

2014

Int J Automot Mech Eng

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In this study a detailed exergetic analysis is made of the components of heat pumps by changing the heat source and heat sink fluid as either water or air. To realize this aim a multifunctional heat pump test system was used, which can be run in four modes, air to air, air to water, water to air and water to water, using one compressor. When the system is run in water to air mode compressor exergy efficiency reaches its highest value. When the system is run in air to water mode the exergy efficiency of the compressor falls to its lowest value. In the heat pump's water to air mode the exergy destruction rate of the compressor becomes minimal. Exergetic performance of the condenser is best when the system is run in water to air mode. When the system runs in air to air mode, the exergy destruction rate of the condenser is at maximum, and falls to minimum when the system runs in air to water mode. Water to water is the running mode in which evaporator exergy efficiency is the best. Exergy efficiency of the evaporator decreases when the temperature of the evaporator fluid increases. Maximum compressor exergy efficiency increases according to an increase of mass flow rate is seemed in the air to air mode. The heat pump mode in which the exergy destruction rate of the compressor is minimal, is water to air mode. The running modes in which the condenser and compressor work with maximum and minimum efficiency are the same: water to air, and air to water modes. The compressor is the component which has maximum exergy efficiency with an average of 61.04% for all tests. Exergy efficiency of the condenser is lowest for all tests with an average of 14.25%

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Performance enhancement of vapor recompression heat pump

Cited by 114 publications

References 33 publications

Simulation and optimization of different pressure thermally coupled distillation for separating a close-boiling mixture of n-butanol and iso-butanol

Simulation and optimization of different pressure thermally coupled distillation for separating a close-boiling mixture of n-butanol and iso-butanol

Evaluation of a novel configuration of bottom flashing on dual distillation columns for saving energy

Determining the Working Conditions of Heat Pump Components According to Running Modes

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