Design and optimization of the heat exchanger network for district heating ammonia heat pumps connected in series

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2018

Documents

DOI

View graph of relations

Denmark presents ambitious climate policies, and in order to fulfil these visions electrically driven large-scale heat pumps (HP) are often mentioned as an important technology for future district heating (DH) systems. To reach the high temperatures needed in current DH systems, the suggested HP installations become complex systems, where heat transfer between the HP cycle and the heat sink takes place at several temperature levels. In this study the heat exchanger network (HEN) between a HP installation consisting of two serially connected two-stage ammonia HP units and a heat sink being heated from 50 °C to 80 °C was investigated. The study applied pinch analysis to estimate the highest attainable Coefficient of Performance (COP) with the given HP configuration. Based on the result of the pinch analysis, a HEN reaching the highest COP was suggested and compared with COPs obtained with three other solutions for a HEN. The result revealed an estimated highest COP of 3.46. The three other design suggestions yielded reductions in the COP of -2.3%, -2.0%, and -1.8% compared to the highest. From this it was concluded that the HEN has an influence on the COP, and that the pinch analysis can be used to estimate the highest COP for a given HP installation. Furthermore, the COP obtained by practical installations was accordingly shown to come close to the target.
Original languageEnglish
Title of host publicationProceedings of the13th IIR-Gustav Lorentzen Conference on Natural Refrigerants
Number of pages11
PublisherInternational Institute of Refrigeration
Publication date2018
DOIs
StateAccepted/In press - 2018
Event13th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2018) - Valencia, Spain

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.

CitationsWeb of Science® Times Cited: No match on DOI

    Keywords

  • Large-scale heat pump, Ammonia system, District heating, Heat exchanger network, COP, Pinch analysis
Download as:
Download as PDF
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
PDF
Download as HTML
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
HTML
Download as Word
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
Word

Download statistics

No data available

ID: 150678653