Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling

Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insigh...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Sterpi, D. [verfasserIn] Tomaselli, G. [verfasserIn] Angelotti, A. [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2018

Schlagwörter:	Ground source heat pump Thermo-active diaphragm wall Energy geostructure Ground heat exchanger Monitoring Finite element model

Übergeordnetes Werk:	Enthalten in: Renewable energy - Amsterdam [u.a.] : Elsevier Science, 1991, 147, Seite 2748-2760
Übergeordnetes Werk:	volume:147 ; pages:2748-2760

DOI / URN:	10.1016/j.renene.2018.11.102

Katalog-ID:	ELV003243982

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520			\|a Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case.
650		4	\|a Ground source heat pump
650		4	\|a Thermo-active diaphragm wall
650		4	\|a Energy geostructure
650		4	\|a Ground heat exchanger
650		4	\|a Monitoring
650		4	\|a Finite element model
700	1		\|a Tomaselli, G. \|e verfasserin \|4 aut
700	1		\|a Angelotti, A. \|e verfasserin \|0 (orcid)0000-0002-9039-2102 \|4 aut
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matchkey_str	article:18790682:2018----::nryefracogonhaecagrebdeidahamalfedbevtosno
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publishDate	2018
allfields	10.1016/j.renene.2018.11.102 doi (DE-627)ELV003243982 (ELSEVIER)S0960-1481(18)31421-6 DE-627 ger DE-627 rda eng 530 620 DE-600 52.56 bkl Sterpi, D. verfasserin aut Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case. Ground source heat pump Thermo-active diaphragm wall Energy geostructure Ground heat exchanger Monitoring Finite element model Tomaselli, G. verfasserin aut Angelotti, A. verfasserin (orcid)0000-0002-9039-2102 aut Enthalten in Renewable energy Amsterdam [u.a.] : Elsevier Science, 1991 147, Seite 2748-2760 Online-Ressource (DE-627)320412091 (DE-600)2001449-1 (DE-576)252613937 1879-0682 nnns volume:147 pages:2748-2760 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 52.56 Regenerative Energieformen alternative Energieformen AR 147 2748-2760
spelling	10.1016/j.renene.2018.11.102 doi (DE-627)ELV003243982 (ELSEVIER)S0960-1481(18)31421-6 DE-627 ger DE-627 rda eng 530 620 DE-600 52.56 bkl Sterpi, D. verfasserin aut Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case. Ground source heat pump Thermo-active diaphragm wall Energy geostructure Ground heat exchanger Monitoring Finite element model Tomaselli, G. verfasserin aut Angelotti, A. verfasserin (orcid)0000-0002-9039-2102 aut Enthalten in Renewable energy Amsterdam [u.a.] : Elsevier Science, 1991 147, Seite 2748-2760 Online-Ressource (DE-627)320412091 (DE-600)2001449-1 (DE-576)252613937 1879-0682 nnns volume:147 pages:2748-2760 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 52.56 Regenerative Energieformen alternative Energieformen AR 147 2748-2760
allfields_unstemmed	10.1016/j.renene.2018.11.102 doi (DE-627)ELV003243982 (ELSEVIER)S0960-1481(18)31421-6 DE-627 ger DE-627 rda eng 530 620 DE-600 52.56 bkl Sterpi, D. verfasserin aut Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case. Ground source heat pump Thermo-active diaphragm wall Energy geostructure Ground heat exchanger Monitoring Finite element model Tomaselli, G. verfasserin aut Angelotti, A. verfasserin (orcid)0000-0002-9039-2102 aut Enthalten in Renewable energy Amsterdam [u.a.] : Elsevier Science, 1991 147, Seite 2748-2760 Online-Ressource (DE-627)320412091 (DE-600)2001449-1 (DE-576)252613937 1879-0682 nnns volume:147 pages:2748-2760 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 52.56 Regenerative Energieformen alternative Energieformen AR 147 2748-2760
allfieldsGer	10.1016/j.renene.2018.11.102 doi (DE-627)ELV003243982 (ELSEVIER)S0960-1481(18)31421-6 DE-627 ger DE-627 rda eng 530 620 DE-600 52.56 bkl Sterpi, D. verfasserin aut Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case. Ground source heat pump Thermo-active diaphragm wall Energy geostructure Ground heat exchanger Monitoring Finite element model Tomaselli, G. verfasserin aut Angelotti, A. verfasserin (orcid)0000-0002-9039-2102 aut Enthalten in Renewable energy Amsterdam [u.a.] : Elsevier Science, 1991 147, Seite 2748-2760 Online-Ressource (DE-627)320412091 (DE-600)2001449-1 (DE-576)252613937 1879-0682 nnns volume:147 pages:2748-2760 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 52.56 Regenerative Energieformen alternative Energieformen AR 147 2748-2760
allfieldsSound	10.1016/j.renene.2018.11.102 doi (DE-627)ELV003243982 (ELSEVIER)S0960-1481(18)31421-6 DE-627 ger DE-627 rda eng 530 620 DE-600 52.56 bkl Sterpi, D. verfasserin aut Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case. Ground source heat pump Thermo-active diaphragm wall Energy geostructure Ground heat exchanger Monitoring Finite element model Tomaselli, G. verfasserin aut Angelotti, A. verfasserin (orcid)0000-0002-9039-2102 aut Enthalten in Renewable energy Amsterdam [u.a.] : Elsevier Science, 1991 147, Seite 2748-2760 Online-Ressource (DE-627)320412091 (DE-600)2001449-1 (DE-576)252613937 1879-0682 nnns volume:147 pages:2748-2760 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 52.56 Regenerative Energieformen alternative Energieformen AR 147 2748-2760
language	English
source	Enthalten in Renewable energy 147, Seite 2748-2760 volume:147 pages:2748-2760
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topic_facet	Ground source heat pump Thermo-active diaphragm wall Energy geostructure Ground heat exchanger Monitoring Finite element model
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authorswithroles_txt_mv	Sterpi, D. @@aut@@ Tomaselli, G. @@aut@@ Angelotti, A. @@aut@@
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author	Sterpi, D.
spellingShingle	Sterpi, D. ddc 530 bkl 52.56 misc Ground source heat pump misc Thermo-active diaphragm wall misc Energy geostructure misc Ground heat exchanger misc Monitoring misc Finite element model Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling
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topic_title	530 620 DE-600 52.56 bkl Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling Ground source heat pump Thermo-active diaphragm wall Energy geostructure Ground heat exchanger Monitoring Finite element model
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title	Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling
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title_full	Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling
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title_sort	energy performance of ground heat exchangers embedded in diaphragm walls: field observations and optimization by numerical modelling
title_auth	Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling
abstract	Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case.
abstractGer	Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case.
abstract_unstemmed	Ground immersed structures thermally activated by embedded heat exchangers represent a solution for building climatization, that combines efficiency, sustainability and cost saving. However, the performance of thermally activated diaphragm walls is influenced by key factors that still require insights, such as the layout of the exchanger pipe, the ratio between exposed and fully immersed parts of the wall, and the variable thermal condition at the excavation side. In this paper, these aspects are investigated first with reference to a full scale monitored diaphragm wall. From the field observations a finite element model is set up, validated by sensitivity analyses and calibrated on the monitoring data. The model is then used to attempt an optimization of the exchanger pipe layout. For given structure, ground conditions, thermal inputs and properties, the energy performance can be improved by limiting the thermal interference between pipe branches circulating fluid at different temperatures, and by taking advantage of the fully immersed part of the wall, on both faces in direct contact with the soil. A suggestion is given for enhanced pipe layouts that meet these requirements and lead to up to a 15.8% increase of exchanged heat rate for the studied case.
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title_short	Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling
remote_bool	true
author2	Tomaselli, G. Angelotti, A.
author2Str	Tomaselli, G. Angelotti, A.
ppnlink	320412091
mediatype_str_mv	c
isOA_txt	false
hochschulschrift_bool	false
doi_str	10.1016/j.renene.2018.11.102
up_date	2024-07-06T18:58:40.027Z
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Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling

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