Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor

Yongseok Jeon; Jongho Jung; Dongwoo Kim; Sunjae Kim; Yong Chan Kim

doi:10.1016/j.apenergy.2017.08.059

Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor

Yongseok Jeon, Jongho Jung, Dongwoo Kim, Sunjae Kim, Yong Chan Kim

School of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

Abstract

The objective of this study was to investigate the effects of ejector geometries on the performance of an ejector-expansion air conditioner (EEAC) considering the cooling seasonal performance factor (CSPF). The performance of the EEAC using R410A was measured and analyzed by varying the compressor speed, outdoor-bin temperature, operating pressures, nozzle-throat diameter, and mixing-section diameter. The EEAC in the medium-capacity mode exhibited maximum coefficient of performance (COP) improvement, i.e., 7.5%, over the baseline (conventional) cycle. The optimum mixing-section diameter was determined to be 9 mm based on the CSPF. In addition, the optimum mixing-section diameter increased with an increase in the annual average outdoor temperature. The CSPF of the EEAC with the optimized mixing-section diameter improved in the range of 16.0–20.3% over the baseline cycle depending on the climatic conditions.

Original language	English
Pages (from-to)	761-768
Number of pages	8
Journal	Applied Energy
Volume	205
DOIs	https://doi.org/10.1016/j.apenergy.2017.08.059
Publication status	Published - 2017 Nov 1

Keywords

CSPF
Ejector-expansion air conditioner
Optimization
Two-phase ejector

ASJC Scopus subject areas

Civil and Structural Engineering
Energy(all)

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10.1016/j.apenergy.2017.08.059

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title = "Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor",

abstract = "The objective of this study was to investigate the effects of ejector geometries on the performance of an ejector-expansion air conditioner (EEAC) considering the cooling seasonal performance factor (CSPF). The performance of the EEAC using R410A was measured and analyzed by varying the compressor speed, outdoor-bin temperature, operating pressures, nozzle-throat diameter, and mixing-section diameter. The EEAC in the medium-capacity mode exhibited maximum coefficient of performance (COP) improvement, i.e., 7.5%, over the baseline (conventional) cycle. The optimum mixing-section diameter was determined to be 9 mm based on the CSPF. In addition, the optimum mixing-section diameter increased with an increase in the annual average outdoor temperature. The CSPF of the EEAC with the optimized mixing-section diameter improved in the range of 16.0–20.3% over the baseline cycle depending on the climatic conditions.",

keywords = "CSPF, Ejector-expansion air conditioner, Optimization, Two-phase ejector",

author = "Yongseok Jeon and Jongho Jung and Dongwoo Kim and Sunjae Kim and Kim, {Yong Chan}",

year = "2017",

month = nov,

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doi = "10.1016/j.apenergy.2017.08.059",

language = "English",

volume = "205",

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journal = "Applied Energy",

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AU - Jeon, Yongseok

AU - Jung, Jongho

AU - Kim, Dongwoo

AU - Kim, Sunjae

AU - Kim, Yong Chan

PY - 2017/11/1

Y1 - 2017/11/1

N2 - The objective of this study was to investigate the effects of ejector geometries on the performance of an ejector-expansion air conditioner (EEAC) considering the cooling seasonal performance factor (CSPF). The performance of the EEAC using R410A was measured and analyzed by varying the compressor speed, outdoor-bin temperature, operating pressures, nozzle-throat diameter, and mixing-section diameter. The EEAC in the medium-capacity mode exhibited maximum coefficient of performance (COP) improvement, i.e., 7.5%, over the baseline (conventional) cycle. The optimum mixing-section diameter was determined to be 9 mm based on the CSPF. In addition, the optimum mixing-section diameter increased with an increase in the annual average outdoor temperature. The CSPF of the EEAC with the optimized mixing-section diameter improved in the range of 16.0–20.3% over the baseline cycle depending on the climatic conditions.

AB - The objective of this study was to investigate the effects of ejector geometries on the performance of an ejector-expansion air conditioner (EEAC) considering the cooling seasonal performance factor (CSPF). The performance of the EEAC using R410A was measured and analyzed by varying the compressor speed, outdoor-bin temperature, operating pressures, nozzle-throat diameter, and mixing-section diameter. The EEAC in the medium-capacity mode exhibited maximum coefficient of performance (COP) improvement, i.e., 7.5%, over the baseline (conventional) cycle. The optimum mixing-section diameter was determined to be 9 mm based on the CSPF. In addition, the optimum mixing-section diameter increased with an increase in the annual average outdoor temperature. The CSPF of the EEAC with the optimized mixing-section diameter improved in the range of 16.0–20.3% over the baseline cycle depending on the climatic conditions.

KW - CSPF

KW - Ejector-expansion air conditioner

KW - Optimization

KW - Two-phase ejector

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JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

ER -

Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor

Abstract

Keywords

ASJC Scopus subject areas

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