Performance Enhancement of Vapor Compression Heat Pumps by a Cooled Compression Cycle

Nasrin Arjomand Kermani, John Terpollari Madsen, Christian Heerup, Brian Elmegaard

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

The presented study proposes a configuration combining the compression and condensation processes in a single unit and evaporation and expansion in another separate unit for application in a vapor compression heat pump cycle. The cycle includes injection of refrigerant into the compressor at a certain temperature. This system makes it possible to match the temperature glide of the heat sink and source and simultaneously condense the refrigerant during the compression.
A mathematical model of a complete cycle was made to study the system parameters and performance improvement of the cycle. Moreover, thermodynamic models of compression-condensation processes as well as a sensitivity analysis were developed to investigate the heat transfer inside the compressor-condenser unit and determine the injection conditions which can achieve the desirable requirements in the cycle model. Advantages such as eliminating thermodynamic losses associated with the desuperheating of refrigerant, reduction of compression work, available hot liquid at the compressor outlet for the district heating system and COP closer to the Lorenz COP can be obtained compared to the conventional cycle. The proposed cycle reached COP of 4.1 and 59 % Lorenz efficiency for a case related to R717 as working fluid and district heating production.
Original languageEnglish
Title of host publicationProceedings of the13th IIR-Gustav Lorentzen Conference on Natural Refrigerants
Volume1
PublisherInternational Institute of Refrigeration
Publication date2018
Pages1054-1063
ISBN (Electronic)978-1-5108-6961-5
DOIs
Publication statusPublished - 2018
Event13th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2018) - Valencia, Spain
Duration: 18 Jun 201820 Jun 2018

Conference

Conference13th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2018)
CountrySpain
CityValencia
Period18/06/201820/06/2018

Bibliographical note

Open access with permission by the International Institute of Refrigeration (www.iifiir.org), organizer of the GL2018 conference.

Keywords

  • Heat pump COP
  • Combined compressor-condenser unit
  • Refrigerant injection
  • Mathematical model
  • COP

Cite this

Arjomand Kermani, N., Terpollari Madsen, J., Heerup, C., & Elmegaard, B. (2018). Performance Enhancement of Vapor Compression Heat Pumps by a Cooled Compression Cycle. In Proceedings of the13th IIR-Gustav Lorentzen Conference on Natural Refrigerants (Vol. 1, pp. 1054-1063). International Institute of Refrigeration. https://doi.org/10.18462/iir.gl.2018.1374
Arjomand Kermani, Nasrin ; Terpollari Madsen, John ; Heerup, Christian ; Elmegaard, Brian. / Performance Enhancement of Vapor Compression Heat Pumps by a Cooled Compression Cycle. Proceedings of the13th IIR-Gustav Lorentzen Conference on Natural Refrigerants . Vol. 1 International Institute of Refrigeration, 2018. pp. 1054-1063
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title = "Performance Enhancement of Vapor Compression Heat Pumps by a Cooled Compression Cycle",
abstract = "The presented study proposes a configuration combining the compression and condensation processes in a single unit and evaporation and expansion in another separate unit for application in a vapor compression heat pump cycle. The cycle includes injection of refrigerant into the compressor at a certain temperature. This system makes it possible to match the temperature glide of the heat sink and source and simultaneously condense the refrigerant during the compression. A mathematical model of a complete cycle was made to study the system parameters and performance improvement of the cycle. Moreover, thermodynamic models of compression-condensation processes as well as a sensitivity analysis were developed to investigate the heat transfer inside the compressor-condenser unit and determine the injection conditions which can achieve the desirable requirements in the cycle model. Advantages such as eliminating thermodynamic losses associated with the desuperheating of refrigerant, reduction of compression work, available hot liquid at the compressor outlet for the district heating system and COP closer to the Lorenz COP can be obtained compared to the conventional cycle. The proposed cycle reached COP of 4.1 and 59 {\%} Lorenz efficiency for a case related to R717 as working fluid and district heating production.",
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author = "{Arjomand Kermani}, Nasrin and {Terpollari Madsen}, John and Christian Heerup and Brian Elmegaard",
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year = "2018",
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Arjomand Kermani, N, Terpollari Madsen, J, Heerup, C & Elmegaard, B 2018, Performance Enhancement of Vapor Compression Heat Pumps by a Cooled Compression Cycle. in Proceedings of the13th IIR-Gustav Lorentzen Conference on Natural Refrigerants . vol. 1, International Institute of Refrigeration, pp. 1054-1063, 13th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2018), Valencia, Spain, 18/06/2018. https://doi.org/10.18462/iir.gl.2018.1374

Performance Enhancement of Vapor Compression Heat Pumps by a Cooled Compression Cycle. / Arjomand Kermani, Nasrin; Terpollari Madsen, John ; Heerup, Christian; Elmegaard, Brian.

Proceedings of the13th IIR-Gustav Lorentzen Conference on Natural Refrigerants . Vol. 1 International Institute of Refrigeration, 2018. p. 1054-1063.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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N1 - Open access with permission by the International Institute of Refrigeration (www.iifiir.org), organizer of the GL2018 conference.

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N2 - The presented study proposes a configuration combining the compression and condensation processes in a single unit and evaporation and expansion in another separate unit for application in a vapor compression heat pump cycle. The cycle includes injection of refrigerant into the compressor at a certain temperature. This system makes it possible to match the temperature glide of the heat sink and source and simultaneously condense the refrigerant during the compression. A mathematical model of a complete cycle was made to study the system parameters and performance improvement of the cycle. Moreover, thermodynamic models of compression-condensation processes as well as a sensitivity analysis were developed to investigate the heat transfer inside the compressor-condenser unit and determine the injection conditions which can achieve the desirable requirements in the cycle model. Advantages such as eliminating thermodynamic losses associated with the desuperheating of refrigerant, reduction of compression work, available hot liquid at the compressor outlet for the district heating system and COP closer to the Lorenz COP can be obtained compared to the conventional cycle. The proposed cycle reached COP of 4.1 and 59 % Lorenz efficiency for a case related to R717 as working fluid and district heating production.

AB - The presented study proposes a configuration combining the compression and condensation processes in a single unit and evaporation and expansion in another separate unit for application in a vapor compression heat pump cycle. The cycle includes injection of refrigerant into the compressor at a certain temperature. This system makes it possible to match the temperature glide of the heat sink and source and simultaneously condense the refrigerant during the compression. A mathematical model of a complete cycle was made to study the system parameters and performance improvement of the cycle. Moreover, thermodynamic models of compression-condensation processes as well as a sensitivity analysis were developed to investigate the heat transfer inside the compressor-condenser unit and determine the injection conditions which can achieve the desirable requirements in the cycle model. Advantages such as eliminating thermodynamic losses associated with the desuperheating of refrigerant, reduction of compression work, available hot liquid at the compressor outlet for the district heating system and COP closer to the Lorenz COP can be obtained compared to the conventional cycle. The proposed cycle reached COP of 4.1 and 59 % Lorenz efficiency for a case related to R717 as working fluid and district heating production.

KW - Heat pump COP

KW - Combined compressor-condenser unit

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BT - Proceedings of the13th IIR-Gustav Lorentzen Conference on Natural Refrigerants

PB - International Institute of Refrigeration

ER -

Arjomand Kermani N, Terpollari Madsen J, Heerup C, Elmegaard B. Performance Enhancement of Vapor Compression Heat Pumps by a Cooled Compression Cycle. In Proceedings of the13th IIR-Gustav Lorentzen Conference on Natural Refrigerants . Vol. 1. International Institute of Refrigeration. 2018. p. 1054-1063 https://doi.org/10.18462/iir.gl.2018.1374