Abstract
This paper presents a life cycle assessment of heat supply scenarios towards replacement of fossil-based energy systems through a case study focusing on an existing gas-fired boiler supplying heat for buildings located in Tallaght, Ireland. The three replacement systems considered are a waste heat-fed heat pump district heating system, a biomass-based district heating system, and an individual gas boiler. Current study found both the district heating systems have lower environmental impact than the conventional boiler system, with the biomass-based system being superior to heat pump. However, using 2030 electricity data showed almost similar impacts for both the district heating systems. Human toxicity potential was found highest among all impact categories studied due to the large additional infrastructure requirement across all three systems, whereas the other impacts, global warming, fossil fuel depletion and eutrophication, were due to involving usage of natural gas and electricity in use phase. The heating system employing biomass as resource showed reduced greenhouse gas (GHG) emissions by 45% and fossil fuel depletion by 73% compared to the conventional boiler. However, using 2030 electricity data, the heat pump system decreased GHG emissions by 42% and fossil fuel depletion by 47%. Further, replacing biomethane with the natural gas decreased global warming by at least 11.4%. The present study concludes that the environmental benefit of a district heating system is largely dependent on the carbon intensity of the electricity it uses, thus recommending the district heating systems for large-scale retrofitting schemes in Ireland to reach Europe’s 2030 GHG reduction targets.
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Abbreviations
- LCA:
-
Life cycle assessment
- DH:
-
District heating
- CHP:
-
Combined heat and power
- WHP-DH:
-
Waste heat-fed heat pump district heating system
- BCHP-DH:
-
Biomass CHP plant district heating system
- GB:
-
Gas boiler
- GWP:
-
Global warming potential
- FFD:
-
Fossil fuel depletion
- EP:
-
Eutrophication potential
- HTTP:
-
Human toxicity potential
- GHG:
-
Greenhouse gas
- NWE:
-
Northwest Europe
- GHS:
-
Geothermal system
- LTDH:
-
Low-temperature district heating
- SDCC:
-
South Dublin County Council
- MWh:
-
Megawatt-hour
- CML:
-
Centrum voor Milieukunde Leiden
- HDPU:
-
High-density polyurethane
- HDPE:
-
High-density polyethylene
- n/a:
-
Not applicable
References
Adolfsson M, Rashid S (2016) Life cycle assessment and life cycle cost of heat exchangers: a case for inter terminals Sweden AB located in port of Gothenburg, Dissertation, Chalmers University of Technology, Sweden. http://publications.lib.chalmers.se/records/fulltext/237796/237796.pdf. Accessed 14 Sep 2018
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) (2017) ASHRAE position document on ammonia as a refrigerant. https://www.ashrae.org/File%20Library/About/Position%20Documents/Ammonia-as-a-Refrigerant-PD-2017.pdf. Accessed 19 June 2020
Bartolozzi I, Rizzi F, Frey M (2017) Are district heating systems and renewable energy sources always an environmental win-win solution? A life cycle assessment case study in Tuscany, Italy. Renew Sustain Energy Rev 80:408–420. https://doi.org/10.1016/j.rser.2017.05.231
Bitpower (2017) Ireland’s Data Hosting Industry 2017. https://www.seai.ie/resources/Irelands-Data-Hosting-Industry-2017.pdf. Accessed 20 Mar 2020
Codema (2018) South Dublin County Council energy review. https://www.codema.ie/images/uploads/docs/2018_SDCC_Energy_Review_WEB_single_page.pdf. Accessed 20 Jan 2021
David A, Mathiesen BV, Averfalk H, Werner S, Lund H (2017) Heat roadmap Europe: large-scale electric heat pumps in district heating systems. Energies 10(4):578. https://doi.org/10.3390/en10040578
Ekvall T, Ljungkvist H (2014) Sustainability assessment of residual heat transfer from Stenungsund to Gothenburg-Report. Swedish Environ Res Inst 2:1069
Environmental European Agency (EEA) (2015) Urban Europe- Statistics on cities, towns, and suburbs- Housing in cities. https://www.eea.europa.eu/soer/2015/europe/urban-systems. Accessed 18 Jan 2021
Euroheat and Power (2013) Heat Roadmap Europe 2050: second pre-study for the EU27, Aalborg University, Denmark. https://www.euroheat.org/wp-content/uploads/2013/05/Heat-Roadmap-Europe-II-2013.pdf. Accessed 9 Jan 2021
Euroheat and Power (2019) Knowledge hub–Country profiles. https://www.euroheat.org/knowledge-hub/country-profiles. Accessed 14 Aug 2021
European Commission (2014) 2030 framework on climate and energy. https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:52014DC0015&from=EN. Accessed 6 June 2020
European Commission (2016) Mapping and analyses of the current and future (2020-2030) heating/cooling fuel deployment (fossil/renewables). https://ec.europa.eu/energy/sites/default/files/documents/mappinghcfinal_report_wpl.pdf. Accessed 21 Feb 2021
European Commission (2018) Directive (EU) 2018/2001 of the European Parliament and of the Council of 11 December 2018 on the promotion of the use of energy from renewable sources (recast). http://data.europa.eu/eli/dir/2018/2001/2018-12-21. Accessed 24 Nov 2021
European Commission (2020) A Renovation Wave for Europe-greening our buildings, creating jobs, improving lives. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:52020DC0662 Accessed 24 Nov 2021
European heat pump association (EHPA) (2019) Large scale heat pumps in Europe- Real examples of heat pump applications in several industrial sectors. https://www.ehpa.org/fileadmin/red/03._Media/03.02_Studies_and_reports/Largeheat pumps_in_Europe_MDN_II_final4_small.pdf. Accessed 24 July 2020
Gartland D (2014) Developing district heating in Ireland: Why should it be developed and what needs to change? Aalborg University, Denmark. https://projekter.aau.dk/projekter/files/198330943/SEPM_4_Master_Thesis_Final.pdf.Accessed 23 June 2020
Gartland D, Bruton T (2016) A Guide to District Heating in Ireland. https://www.seai.ie/publications/2016_RDD_79._Guide_District_Heating_IrelandCODEMA.pdf. Accessed 14 Nov 2020
German Biomass Research Centre (DBFZ) (2016) LCA of Biomethane–Main challenges in the EU RED context. Biomasseforschungszentrum, Germany. http://european-biogas.eu/wp-content/uploads/2016/05/05_Oehmichen-Majer-Malmo-2016.pdf. Accessed 2 July 2020
Greening B, Azapagic A (2012) Domestic heat pumps: Life cycle environmental impacts and potential implications for the UK. Energy 39(1):205–217. https://doi.org/10.1016/j.energy.2012.01.028
Hammar T, Levihn F (2020) Time-dependent climate impact of biomass use in a fourth-generation district heating system, including BECCS. Biomass Bioenergy 138:105606. https://doi.org/10.1016/j.biombioe.2020.105606
HeatNet (2020) Spatial policy for 4DHC - Overview of policies in HeatNet countries. https://guidetodistrictheating.eu/wp-content/uploads/2020/08/HeatNet-NWE_Spatial-Policy-for-4DHC_District-Heating.pdf. Accessed 14 Aug 2021
HeatNet NWE (2019) Interreg North-West Europe-Transition strategies for delivering low carbon district heat. https://www.nweurope.eu/projects/project-search/heatnet-transition-strategies-for-delivering-low-carbon-district-heat. Accessed 10 Jan 2021
International energy agency IEA (2020) The Netherlands 2020 Energy policy review. https://iea.blob.core.windows.net/assets/93f03b36-64a9-4366-9d5f-0261d73d68b3/The_Netherlands_2020_Energy_Policy_Review.pdf. Accessed 14 Mar 2021
Irish bioenergy association IRA (2017) Planning guidance recommendations for bioenergy projects in Ireland. https://www.seai.ie/publications/IrBEA-Bioenergy-Planning-Report-RDD-00112-2017.pdf. Accessed 15 Aug 2021
Irish EPA (2019) Ireland’s Greenhouse Gas Emission Projections:2018–2040’. https://www.epa.ie/pubs/reports/air/airemission/ghgprojections2018-2040/GreenhouseGasProjections.pdf. Accessed 3 July 2020
ISO 14040 (2006) Environmental management life cycle assessment principles and framework. International Organization for Standardization. https://www.iso.org/standard/37456.html. Accessed 20 June 2020
Karlsson J, Brunzell L, Venkatesh G (2018) Material-flow analysis, energy analysis, and partial environmental-LCA of a district-heating combined heat and power plant in Sweden. Energy 144:31–40. https://doi.org/10.1016/j.energy.2017.11.159
Kljajić MV, Anđelković AS, Hasik V, Munćan VM, Bilec M (2020) Shallow geothermal energy integration in district heating system: an example from Serbia. Renew Energy 147(2):2791–2800. https://doi.org/10.1016/j.renene.2018.11.103
Koroneos C, Nanaki E (2017) Environmental impact assessment of a ground source heat pump system in Greece. Geothermics 65:1–9. https://doi.org/10.1016/j.geothermics.2016.08.005
Li Y, Mojiri A, Rosengarten G, Stanley C (2021) Residential demand-side management using integrated solar-powered heat pump and thermal storage. Energy Build. https://doi.org/10.1016/j.enbuild.2021.111234
Logstor (2018) Product catalogue version 2018.06. https://www.logstor.com/media/5918/product-catalogue-uk-201806.pdf. Accessed 12 Mar 2019
Lu T, Lü X, Remes M, Viljanen M (2011) Investigation of air management and energy performance in a data center in Finland: case study. Energ Build 43(12):3360–3372. https://doi.org/10.1016/j.enbuild.2011.08.034
Lund H, Werner S, Wiltshire R, Svendsen S, Thorsen JE, Hvelplund F, Mathiesen BV (2014) 4th Generation District Heating (4GDH): Integrating smart thermal grids into future sustainable energy systems. Energy 68:1–11. https://doi.org/10.1016/j.energy.2014.02.089
Miralles JAL, García RL, Carnicero JMP, Martínez FJR (2020) Comparative study of heat pump system and biomass boiler system to a tertiary building using the Life Cycle Assessment. Renew Energy 152:1439–1450. https://doi.org/10.1016/j.renene.2019.12.148
Murphy F, Devlin G, McDonnell K (2014) Forest biomass supply chains in Ireland: a life cycle assessment of GHG emissions and primary energy balances. Appl Energ 116:1040–1055
Murphy F, Sosa A, McDonnell K, Devlin G (2016) Life cycle assessment of biomass-to-energy systems in Ireland modelled with biomass supply chain optimisation based on greenhouse gas emission reduction. Energy 109:1040–1055. https://doi.org/10.1016/j.energy.2016.04.125
Neirotti F, Noussan M, Simonetti M (2020) Evaluating the emissions of the heat supplied by district heating networks through a life cycle perspective. Clean Technol 2(4):392–405. https://doi.org/10.3390/cleantechnol2040024
Nitkiewicz A, Sekret R (2014) Comparison of LCA results of low temperature heat plant using electric heat pump, absorption heat pump and gas-fired boiler. Energy Convers Manag 87:647–652. https://doi.org/10.1016/j.enconman.2014.07.032
Oliver-Solà J, Gabarrell X, Rieradevall J (2009) Environmental impacts of the infrastructure for district heating in urban neighbourhoods. Energ Policy 37(11):4711–4719. https://doi.org/10.1016/j.enpol.2009.06.025
Puettmann ME, Lippke B (2013) Using life-cycle assessments to demonstrate the impact of using wood waste as a renewable fuel in urban settings for district heating. For Prod J 63(1):24–27. https://doi.org/10.13073/FPJ-D-13-00012
Ricardo Energy and Environment (REE) (2016) Assessment of cost and benefits of biogas and biomethane in Ireland. Sustainable Energy Authority Ireland. https://www.seai.ie/resources/publications/Assessment-of-Cost-and-Benefits-of-Biogas-and-Biomethane-in-Ireland.pdf. Accessed 26 April 2020
Rinne S, Syri S (2013) Heat pumps versus combined heat and power production as CO2 reduction measures in Finland. Energy 57:308–318. https://doi.org/10.1016/j.energy.2013.05.033
Sustainable energy authority of Ireland (SEAI) (2018) Energy-related CO2 emissions in Ireland 2005–2016. https://www.sustainableenergyireland.ie/publications/Energy-Emissions-2017-Final.pdf. Accessed 24 Jan 2021
Sustainable energy authority of Ireland (SEAI) (2019) Renewable energy in Ireland. https://www.seai.ie/publications/Renewable-Energy-in-Ireland-2019.pdf. Accessed 15 Feb 2021
Sustainable energy authority of Ireland (SEAI) (2020a) Energy in Ireland. https://www.seai.ie/publications/Energy-in-Ireland-2020.pdf. Accessed 15 Feb 2021
Sustainable energy authority of Ireland (SEAI) (2020b) Energy security in Ireland https://www.seai.ie/publications/Energy-Security-in-Ireland-2020-.pdf. Accessed 15 Feb 2021
Thinkstep (2018) GaBi LCA database documentation. Retrieved from thinkstep AG: http://database-documentation.gabi-software.com or http://www.gabisoftware.com/international/databases/. Accessed 25 June 2020
Van Der Kooij D, Veenendaal H, Scheffer W (2005) Biofilm formation and multiplication of Legionella in a model warm water system with pipes of copper, stainless steel and cross-linked polyethylene. Water Res 39(13):2789–2798. https://doi.org/10.1016/j.watres.2005.04.075
Whiting A, Azapagic A (2014) Life cycle environmental impacts of generating electricity and heat from biogas produced by anaerobic digestion. Energy 70:181–193. https://doi.org/10.1016/j.energy.2014.03.103
Wu J, Yang Z, Wu Q, Zhu Y (2012) Transient behaviour and dynamic performance of cascade heat pump water heater with thermal storage system. Appl Energy 91(1):187–196. https://doi.org/10.1016/j.apenergy.2011.09.020
Acknowledgements
The authors would like to thank the staff of Energy Efficiency Agency Dublin (Codema), especially John O’Shea for sharing their technical knowledge and advice on the project.
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CM: conceptualisation, investigation, data curation, methodology, writing—original draft, review and editing; MKM: validation, writing—review and editing; DG: validation, writing—review; FM: supervision, validation, writing—review & editing.
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Mahon, C., Mediboyina, M.K., Gartland, D. et al. Life cycle assessment of Irish district heating systems: a comparison of waste heat pump, biomass-based and conventional gas boiler. Clean Techn Environ Policy 24, 1437–1451 (2022). https://doi.org/10.1007/s10098-021-02257-y
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DOI: https://doi.org/10.1007/s10098-021-02257-y