Effect of a double-row liquid–vapor separation condenser on an air-conditioning unit performance

Zhong, Tianming; Ding, Lixing; Chen, Shu; Chen, Ying; Yang, Qingcheng; Luo, Yuhe

doi:10.1016/j.applthermaleng.2018.07.015

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Chen et al [15] assessed the ability of liquid-vapor separation condensers (LSC) and found that the COP of the LSC system was improved by 11.1% compared with the baseline system. To further improve the LSC system, Zhong et al [16] studied the impact of a double-row liquid-vapor separation condenser (DLSC) on the RAC system cooling performance. This novel condenser achieved an improvement in the COP by about 30%.…”

Section: Introductionmentioning

confidence: 99%

Energy-Saving Potential of Thermal Diode Tank Assisted Refrigeration and Air-Conditioning Systems

Wang

Chen

2021

Energies

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Lowering the condensing temperature of the Refrigeration and Air-conditioning (RAC) system has been proven to effectively increase the system’s Coefficient of Performance (COP). This paper revolves around evaluating the energy-saving generated by applying a Thermal Diode Tank (TDT) in the RAC systems. The TDT is a novel invention, which is an insulated water tank equipped with gravity heat pipes. If the TDT was placed outdoors overnight, its inside water would theoretically be at the minimum ambient temperature of the previous night. When the TDT water is used to cool the condenser of RAC systems that operate during the daytime, a higher COP of this TDT assisted RAC (TDT-RAC) system could be achieved compared with the baseline system. In this study, a steady-state performance simulation model for TDT-RAC cycles has been developed. The model reveals that the COP of the TDT-RAC cycle can be improved by 10~59% over the baseline cycle depending on the compressor types. The TDT-RAC cycle with a variable speed compressor can save more energy than that with a fixed speed compressor. In addition, TDT-RAC cycles can save more energy with a higher day/night ambient temperature difference. There is a threshold tank size for a given TDT-RAC cycle to save energy, and the energy-saving can be improved by enlarging the tank size. A desk-top case study based on real weather data for Adelaide in January 2021 shows that 9~40% energy could be saved by TDT-RAC systems every summer day on average.

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Section: Introductionmentioning

confidence: 99%

Energy-Saving Potential of Thermal Diode Tank Assisted Refrigeration and Air-Conditioning Systems

Wang

Chen

2021

Energies

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“…This model appears accurate, simplified and low computational cost and was used to optimise the tube-pass strategy of the condenser. Zhong et al [22][23][24][25] implemented the same model to simulate the performance of single/duo-slab parallel flow microchannel condensers (PFMCs) with liquid-vapor separation. Luo et al [26][27] applied the model for the optimization of the MPFCs-LS in organic Rankine circle.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of multi-pass parallel flow condensers with liquid-vapor separation

et al. 2019

International Journal of Heat and Mass Transfer

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Liquid-vapor separation is an advanced technology recently developed enabling significant further heat transfer enhancement for condensers. This paper reports a distributed parameter model, using the ε-NTU method, to numerically simulate heat transfer performance of multi-pass parallel flow condensers with liquid-vapor separation (referred to as MPFCs-LS). For achieving higher accurate results and lower computational time, a segment self-subdivision method is used to locate the positions of onset and completion of condensation. Furthermore genetic algorithm is adopted to determine the refrigerant flow rates through tubes in a flow pass. Relevant empirical correlations are selected for heat transfer and frictional pressure drop in different flow regimes during condensation in microfin tubes. The predictions of the model agree well with the experimental data within ±20%. The model and numerical methods developed in this work for MPFCs-LS are of important value in design and performance optimization of these new advanced condensers.

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Performance analysis of room air conditioners via questionnaire and integrated field test

Yang

Xiao

Sun

et al. 2021

Applied Thermal Engineering

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Effect of a double-row liquid–vapor separation condenser on an air-conditioning unit performance

Cited by 4 publications

References 19 publications

Energy-Saving Potential of Thermal Diode Tank Assisted Refrigeration and Air-Conditioning Systems

Energy-Saving Potential of Thermal Diode Tank Assisted Refrigeration and Air-Conditioning Systems

Numerical simulation of multi-pass parallel flow condensers with liquid-vapor separation

Performance analysis of room air conditioners via questionnaire and integrated field test

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