Rapid estimation of geothermal coverage by district heating systems

dc.contributor.author	Γελεγένης, Ιωάννης Ι.	el
dc.date.accessioned	2015-04-28T08:02:40Z
dc.date.available	2015-04-28T08:02:40Z
dc.date.issued	2015-04-28
dc.identifier.uri	http://hdl.handle.net/11400/9137
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://www.sciencedirect.com/	en
dc.subject	Geothermal energy
dc.subject	District heating
dc.subject	Γεωθερμική ενέργεια
dc.subject	Τηλεθέρμανση
dc.title	Rapid estimation of geothermal coverage by district heating systems	en
heal.type	journalArticle
heal.classification	Technology
heal.classification	Energy
heal.classification	Τεχνολογία
heal.classification	Ενέργεια
heal.classificationURI	http://zbw.eu/stw/descriptor/10470-6
heal.classificationURI	http://zbw.eu/stw/descriptor/14175-2
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Ενέργεια
heal.keywordURI	http://zbw.eu/stw/descriptor/14180-2
heal.keywordURI	http://zbw.eu/stw/descriptor/14177-5
heal.identifier.secondary	doi:10.1016/j.apenergy.2004.04.008
heal.language	en
heal.access	campus
heal.recordProvider	Τ.Ε.Ι Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Ενεργειακής Τεχνολογίας Τ.Ε.	el
heal.publicationDate	2004
heal.bibliographicCitation	Gelegenis, J. (April 2005). Rapid estimation of geothermal coverage by district heating systems. Applied Energy. 80(4). pp. 401-426. Elsevier: 2005. Available from: http://www.sciencedirect.com/science/article/pii/S0306261904000728 [Accessed 24/04/2004]	en
heal.abstract	An algorithm is developed for the quick estimation of the fraction of annual heat-load that is covered by geothermal energy in district-heating systems. The cases of direct use, heat exchange and heat-pump application are distinguished. The algorithm proved accurate enough for pre-feasibility study purposes and for preliminary considerations with regard to the management of geothermal energy. It is demonstrated that for coverage estimation, detailed heat-supply calculations can be substituted by the use of degree-days, which are quite often available for various base temperatures. Furthermore, the analytic expressions of the algorithm allow the quantitative evaluation of several parameters. Specifically, for low temperature geothermal fluids the coverage is an increasing second-degree function of the temperature of the fluids. Increasing network return temperatures has also a decreasing effect on the coverage. The required geothermal-flow is inversely proportional to the heat exchanger effectiveness, for the same coverage. Application of a heat pump results in a higher coverage that should otherwise require a higher temperature fluid. It is consequently defined as an equivalent geothermal-temperature increase – due to the heat pump – that is proved to be proportional to the compressor capacity. Last, the network supply-temperatures have a rather secondary effect upon the coverage, affecting the flow through the network and so the effectiveness of the heat exchanger.	en
heal.publisher	Elsevier	en
heal.journalName	Applied Energy	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true