Performance of heat pumps using pure and mixed refrigerants with maldistribution effects in plate heat exchanger evaporators

Roberta Mancini*, Benjamin Zühlsdorf, Vikrant Aute, Wiebke Brix Markussen, Brian Elmegaard

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents a combined plate heat exchanger (PHE) - heat pump simulation framework for the evaluation of flow maldistribution in PHE evaporators and its effect on the cycle thermodynamic and economic performance. A case study of heat pump integration for waste heat recovery purposes in data centres was chosen to demonstrate the utilization of the simulation tool. The analyses were made for the pure fluids butane and propane, and for the zeotropic mixtures propylene/butane at (0.5,0.5) mass composition and CO2/dimethyl ether (DME) (0.2,0.8) as refrigerants. Both liquid/vapour maldistribution and the effect of end plates were considered in the heat exchanger models. Results show that butane is most sensitive to maldistribution, with a maximum Coefficient of Performance (COP) reduction of 5.9 %, while propane experiences the lowest reduction of 2.5 %. The different sensitivity of the working fluids to maldistribution was found to be related to the evaporator design, refrigerant pressure drop, and fluid properties. Last, the results of the economic analysis show that a higher specific cost of heat is obtained when considering maldistribution effects.
Original languageEnglish
JournalInternational Journal of Refrigeration
Volume104
Pages (from-to)390-403
ISSN0140-7007
DOIs
Publication statusPublished - 2019

Keywords

  • Plate heat exchanger
  • Liquid-vapour maldistribution
  • End plates
  • Pressure drop
  • Zeotropic mixtures
  • Economic analysis

Cite this

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title = "Performance of heat pumps using pure and mixed refrigerants with maldistribution effects in plate heat exchanger evaporators",
abstract = "This paper presents a combined plate heat exchanger (PHE) - heat pump simulation framework for the evaluation of flow maldistribution in PHE evaporators and its effect on the cycle thermodynamic and economic performance. A case study of heat pump integration for waste heat recovery purposes in data centres was chosen to demonstrate the utilization of the simulation tool. The analyses were made for the pure fluids butane and propane, and for the zeotropic mixtures propylene/butane at (0.5,0.5) mass composition and CO2/dimethyl ether (DME) (0.2,0.8) as refrigerants. Both liquid/vapour maldistribution and the effect of end plates were considered in the heat exchanger models. Results show that butane is most sensitive to maldistribution, with a maximum Coefficient of Performance (COP) reduction of 5.9 {\%}, while propane experiences the lowest reduction of 2.5 {\%}. The different sensitivity of the working fluids to maldistribution was found to be related to the evaporator design, refrigerant pressure drop, and fluid properties. Last, the results of the economic analysis show that a higher specific cost of heat is obtained when considering maldistribution effects.",
keywords = "Plate heat exchanger, Liquid-vapour maldistribution, End plates, Pressure drop, Zeotropic mixtures, Economic analysis",
author = "Roberta Mancini and Benjamin Z{\"u}hlsdorf and Vikrant Aute and Markussen, {Wiebke Brix} and Brian Elmegaard",
year = "2019",
doi = "10.1016/j.ijrefrig.2019.05.023",
language = "English",
volume = "104",
pages = "390--403",
journal = "International Journal of Refrigeration",
issn = "0140-7007",
publisher = "Elsevier",

}

Performance of heat pumps using pure and mixed refrigerants with maldistribution effects in plate heat exchanger evaporators. / Mancini, Roberta; Zühlsdorf, Benjamin; Aute, Vikrant; Markussen, Wiebke Brix; Elmegaard, Brian.

In: International Journal of Refrigeration, Vol. 104, 2019, p. 390-403.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Performance of heat pumps using pure and mixed refrigerants with maldistribution effects in plate heat exchanger evaporators

AU - Mancini, Roberta

AU - Zühlsdorf, Benjamin

AU - Aute, Vikrant

AU - Markussen, Wiebke Brix

AU - Elmegaard, Brian

PY - 2019

Y1 - 2019

N2 - This paper presents a combined plate heat exchanger (PHE) - heat pump simulation framework for the evaluation of flow maldistribution in PHE evaporators and its effect on the cycle thermodynamic and economic performance. A case study of heat pump integration for waste heat recovery purposes in data centres was chosen to demonstrate the utilization of the simulation tool. The analyses were made for the pure fluids butane and propane, and for the zeotropic mixtures propylene/butane at (0.5,0.5) mass composition and CO2/dimethyl ether (DME) (0.2,0.8) as refrigerants. Both liquid/vapour maldistribution and the effect of end plates were considered in the heat exchanger models. Results show that butane is most sensitive to maldistribution, with a maximum Coefficient of Performance (COP) reduction of 5.9 %, while propane experiences the lowest reduction of 2.5 %. The different sensitivity of the working fluids to maldistribution was found to be related to the evaporator design, refrigerant pressure drop, and fluid properties. Last, the results of the economic analysis show that a higher specific cost of heat is obtained when considering maldistribution effects.

AB - This paper presents a combined plate heat exchanger (PHE) - heat pump simulation framework for the evaluation of flow maldistribution in PHE evaporators and its effect on the cycle thermodynamic and economic performance. A case study of heat pump integration for waste heat recovery purposes in data centres was chosen to demonstrate the utilization of the simulation tool. The analyses were made for the pure fluids butane and propane, and for the zeotropic mixtures propylene/butane at (0.5,0.5) mass composition and CO2/dimethyl ether (DME) (0.2,0.8) as refrigerants. Both liquid/vapour maldistribution and the effect of end plates were considered in the heat exchanger models. Results show that butane is most sensitive to maldistribution, with a maximum Coefficient of Performance (COP) reduction of 5.9 %, while propane experiences the lowest reduction of 2.5 %. The different sensitivity of the working fluids to maldistribution was found to be related to the evaporator design, refrigerant pressure drop, and fluid properties. Last, the results of the economic analysis show that a higher specific cost of heat is obtained when considering maldistribution effects.

KW - Plate heat exchanger

KW - Liquid-vapour maldistribution

KW - End plates

KW - Pressure drop

KW - Zeotropic mixtures

KW - Economic analysis

U2 - 10.1016/j.ijrefrig.2019.05.023

DO - 10.1016/j.ijrefrig.2019.05.023

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JO - International Journal of Refrigeration

JF - International Journal of Refrigeration

SN - 0140-7007

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