Experimental study on diffusion absorption refrigeration systems with low GWP refrigerants

Gahyeong Kim; Hyung Won Choi; Gawon Lee; Jang Seok Lee; Yong Tae Kang

doi:10.1016/j.energy.2020.117626

Experimental study on diffusion absorption refrigeration systems with low GWP refrigerants

Gahyeong Kim, Hyung Won Choi, Gawon Lee, Jang Seok Lee, Yong Tae Kang

School of Mechanical Engineering

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

10 Citations (Scopus)

Abstract

The diffusion absorption refrigeration (DAR) cycle is driven by heat input. The DAR systems do not employ pumps or compressors; they use refrigerants, absorbents, and auxiliary gases as working fluids. In this study, experiments were conducted on refrigerants with low GWP. The refrigerants R1234ze(E) and R600a (a natural refrigerant) were used in the DAR cycles with dimethylacetamide (DMAC) and isooctane as the absorbents, respectively. To investigate the operating characteristics of refrigerants with low GWP in the DAR cycle, the evaporation temperature and generator outlet temperature of the cycle were analyzed against the concentration of the working fluid and its charge pressure. In addition, the performance of the cycle was evaluated by the bubble pump shape. Using the results, the relationship between the shape of the bubble pump and the performance of the DAR cycle was analyzed. The maximum coefficient of performance of DAR achieved using R600a/isooctane was estimated as 0.157with the tube diameter of 3.17 mm and that of R1234ze(E)/DMAC DAR was estimated as 0.134 with the tube diameter of 4.76 mm.

Original language	English
Article number	117626
Journal	Energy
Volume	201
DOIs	https://doi.org/10.1016/j.energy.2020.117626
Publication status	Published - 2020 Jun 15

Keywords

Absorbents
Bubble pump
COP
Diffusion absorption refrigeration (DAR)
Low GWP refrigerants

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Pollution
Mechanical Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

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10.1016/j.energy.2020.117626

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title = "Experimental study on diffusion absorption refrigeration systems with low GWP refrigerants",

abstract = "The diffusion absorption refrigeration (DAR) cycle is driven by heat input. The DAR systems do not employ pumps or compressors; they use refrigerants, absorbents, and auxiliary gases as working fluids. In this study, experiments were conducted on refrigerants with low GWP. The refrigerants R1234ze(E) and R600a (a natural refrigerant) were used in the DAR cycles with dimethylacetamide (DMAC) and isooctane as the absorbents, respectively. To investigate the operating characteristics of refrigerants with low GWP in the DAR cycle, the evaporation temperature and generator outlet temperature of the cycle were analyzed against the concentration of the working fluid and its charge pressure. In addition, the performance of the cycle was evaluated by the bubble pump shape. Using the results, the relationship between the shape of the bubble pump and the performance of the DAR cycle was analyzed. The maximum coefficient of performance of DAR achieved using R600a/isooctane was estimated as 0.157with the tube diameter of 3.17 mm and that of R1234ze(E)/DMAC DAR was estimated as 0.134 with the tube diameter of 4.76 mm.",

keywords = "Absorbents, Bubble pump, COP, Diffusion absorption refrigeration (DAR), Low GWP refrigerants",

author = "Gahyeong Kim and Choi, {Hyung Won} and Gawon Lee and Lee, {Jang Seok} and Kang, {Yong Tae}",

note = "Funding Information: This work (Grants No. C2016023457 ) was partially supported by LG Electronics Inc. and partially supported by Korea Institute of Energy Technology Evaluation and Planning ( KETEP ) grant funded by the Korea government ( MOTIE ) (No. 10060218 , The development of cooling capacity 200RT class triple effect gas fired absorption chiller). Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

year = "2020",

month = jun,

day = "15",

doi = "10.1016/j.energy.2020.117626",

language = "English",

volume = "201",

journal = "Energy",

issn = "0360-5442",

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TY - JOUR

T1 - Experimental study on diffusion absorption refrigeration systems with low GWP refrigerants

AU - Kim, Gahyeong

AU - Choi, Hyung Won

AU - Lee, Gawon

AU - Lee, Jang Seok

AU - Kang, Yong Tae

N1 - Funding Information: This work (Grants No. C2016023457 ) was partially supported by LG Electronics Inc. and partially supported by Korea Institute of Energy Technology Evaluation and Planning ( KETEP ) grant funded by the Korea government ( MOTIE ) (No. 10060218 , The development of cooling capacity 200RT class triple effect gas fired absorption chiller). Publisher Copyright: © 2020 Elsevier Ltd

PY - 2020/6/15

Y1 - 2020/6/15

N2 - The diffusion absorption refrigeration (DAR) cycle is driven by heat input. The DAR systems do not employ pumps or compressors; they use refrigerants, absorbents, and auxiliary gases as working fluids. In this study, experiments were conducted on refrigerants with low GWP. The refrigerants R1234ze(E) and R600a (a natural refrigerant) were used in the DAR cycles with dimethylacetamide (DMAC) and isooctane as the absorbents, respectively. To investigate the operating characteristics of refrigerants with low GWP in the DAR cycle, the evaporation temperature and generator outlet temperature of the cycle were analyzed against the concentration of the working fluid and its charge pressure. In addition, the performance of the cycle was evaluated by the bubble pump shape. Using the results, the relationship between the shape of the bubble pump and the performance of the DAR cycle was analyzed. The maximum coefficient of performance of DAR achieved using R600a/isooctane was estimated as 0.157with the tube diameter of 3.17 mm and that of R1234ze(E)/DMAC DAR was estimated as 0.134 with the tube diameter of 4.76 mm.

AB - The diffusion absorption refrigeration (DAR) cycle is driven by heat input. The DAR systems do not employ pumps or compressors; they use refrigerants, absorbents, and auxiliary gases as working fluids. In this study, experiments were conducted on refrigerants with low GWP. The refrigerants R1234ze(E) and R600a (a natural refrigerant) were used in the DAR cycles with dimethylacetamide (DMAC) and isooctane as the absorbents, respectively. To investigate the operating characteristics of refrigerants with low GWP in the DAR cycle, the evaporation temperature and generator outlet temperature of the cycle were analyzed against the concentration of the working fluid and its charge pressure. In addition, the performance of the cycle was evaluated by the bubble pump shape. Using the results, the relationship between the shape of the bubble pump and the performance of the DAR cycle was analyzed. The maximum coefficient of performance of DAR achieved using R600a/isooctane was estimated as 0.157with the tube diameter of 3.17 mm and that of R1234ze(E)/DMAC DAR was estimated as 0.134 with the tube diameter of 4.76 mm.

KW - Absorbents

KW - Bubble pump

KW - COP

KW - Diffusion absorption refrigeration (DAR)

KW - Low GWP refrigerants

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JO - Energy

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Experimental study on diffusion absorption refrigeration systems with low GWP refrigerants

Abstract

Keywords

ASJC Scopus subject areas

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