Model-based optimizations of packaged rooftop air conditioners using low global warming potential refrigerants

Bo Shen; Omar Abdelaziz; Som Shrestha; Ahmed Elatar

doi:10.1016/j.ijrefrig.2017.10.028

Model-based optimizations of packaged rooftop air conditioners using low global warming potential refrigerants

Bo Shen, Omar Abdelaziz, Som Shrestha, Ahmed Elatar

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

17 Scopus citations

Abstract

Based on laboratory investigations for R-22 and R-410A alternative low GWP refrigerants in two baseline rooftop air conditioners (RTU), the DOE/ORNL Heat Pump Design Model was used to model the two RTUs and the models were calibrated against the experimental data. We compared the compressor efficiencies and heat exchanger performances. An efficiency-based compressor mapping method was developed. Extensive model-based optimizations were conducted to provide a fair comparison between all the low GWP candidates by selecting optimal configurations. The results illustrate that all the R-22 low GWP refrigerants will lead to slightly lower COPs. ARM-20B appears to be the best R-22 replacement at normal conditions. At higher ambient temperatures, ARM-20A exhibits better performance. All R-410A low GWP candidates will result in similar or better efficiencies than R-410A. R-32 has the best COP while requiring the smallest compressor. R-452B uses the closest compressor displacement volume and achieves the same efficiency as R-410A.

Original language	English
Pages (from-to)	106-117
Number of pages	12
Journal	International Journal of Refrigeration
Volume	87
DOIs	https://doi.org/10.1016/j.ijrefrig.2017.10.028
State	Published - Mar 2018

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Funders	Funder number
U.S. Department of Energy

Keywords

Alternative refrigerants
Global warming potential
Modeling
Optimization
Rooftop air conditioner

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10.1016/j.ijrefrig.2017.10.028

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title = "Model-based optimizations of packaged rooftop air conditioners using low global warming potential refrigerants",

abstract = "Based on laboratory investigations for R-22 and R-410A alternative low GWP refrigerants in two baseline rooftop air conditioners (RTU), the DOE/ORNL Heat Pump Design Model was used to model the two RTUs and the models were calibrated against the experimental data. We compared the compressor efficiencies and heat exchanger performances. An efficiency-based compressor mapping method was developed. Extensive model-based optimizations were conducted to provide a fair comparison between all the low GWP candidates by selecting optimal configurations. The results illustrate that all the R-22 low GWP refrigerants will lead to slightly lower COPs. ARM-20B appears to be the best R-22 replacement at normal conditions. At higher ambient temperatures, ARM-20A exhibits better performance. All R-410A low GWP candidates will result in similar or better efficiencies than R-410A. R-32 has the best COP while requiring the smallest compressor. R-452B uses the closest compressor displacement volume and achieves the same efficiency as R-410A.",

keywords = "Alternative refrigerants, Global warming potential, Modeling, Optimization, Rooftop air conditioner",

author = "Bo Shen and Omar Abdelaziz and Som Shrestha and Ahmed Elatar",

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doi = "10.1016/j.ijrefrig.2017.10.028",

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AU - Shen, Bo

AU - Abdelaziz, Omar

AU - Shrestha, Som

AU - Elatar, Ahmed

PY - 2018/3

Y1 - 2018/3

N2 - Based on laboratory investigations for R-22 and R-410A alternative low GWP refrigerants in two baseline rooftop air conditioners (RTU), the DOE/ORNL Heat Pump Design Model was used to model the two RTUs and the models were calibrated against the experimental data. We compared the compressor efficiencies and heat exchanger performances. An efficiency-based compressor mapping method was developed. Extensive model-based optimizations were conducted to provide a fair comparison between all the low GWP candidates by selecting optimal configurations. The results illustrate that all the R-22 low GWP refrigerants will lead to slightly lower COPs. ARM-20B appears to be the best R-22 replacement at normal conditions. At higher ambient temperatures, ARM-20A exhibits better performance. All R-410A low GWP candidates will result in similar or better efficiencies than R-410A. R-32 has the best COP while requiring the smallest compressor. R-452B uses the closest compressor displacement volume and achieves the same efficiency as R-410A.

AB - Based on laboratory investigations for R-22 and R-410A alternative low GWP refrigerants in two baseline rooftop air conditioners (RTU), the DOE/ORNL Heat Pump Design Model was used to model the two RTUs and the models were calibrated against the experimental data. We compared the compressor efficiencies and heat exchanger performances. An efficiency-based compressor mapping method was developed. Extensive model-based optimizations were conducted to provide a fair comparison between all the low GWP candidates by selecting optimal configurations. The results illustrate that all the R-22 low GWP refrigerants will lead to slightly lower COPs. ARM-20B appears to be the best R-22 replacement at normal conditions. At higher ambient temperatures, ARM-20A exhibits better performance. All R-410A low GWP candidates will result in similar or better efficiencies than R-410A. R-32 has the best COP while requiring the smallest compressor. R-452B uses the closest compressor displacement volume and achieves the same efficiency as R-410A.

KW - Alternative refrigerants

KW - Global warming potential

KW - Modeling

KW - Optimization

KW - Rooftop air conditioner

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EP - 117

JO - International Journal of Refrigeration

JF - International Journal of Refrigeration

ER -

Model-based optimizations of packaged rooftop air conditioners using low global warming potential refrigerants

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