Enhancing ground source heat pump performance : the role of phase change material integrated grouts in subsurface temperature control

Ahmed, Fawad (avtor), Massarotti, Nicola (avtor), Šarler, Božidar (avtor)

Ground source heat pump (GSHP) systems are increasingly being adopted for heating and cooling applications. However, their continuous operation can lead to thermal imbalances in the ground, which may impact overall system performance. This study investigates the thermal performance of a coaxial ground heat exchanger (CGHE) in a GSHP system, using different grouting materials: reference grout, enhanced grout, micro-encapsulated phase change material (MEPCM) grout, and shape-stabilized phase change material (SSPCM) grout. The effects of these grouts on the heat exchange efficiency and ground temperature variation are analyzed. Additionally, the integration of phase change materials (PCMs) into grouts is examined for its potential to improve thermal performance. Results show that the thermal conductivity of grout has a significant influence on system performance, affecting heat transfer. Among the grouts tested, the SSPCM-integrated grout outperformed others, achieving an average specific power of 5.72 kW/m for cooling and 4.06 kW/m for heating. Furthermore, the ground temperature with PCM-integrated grouts fluctuated between 20 °C and 23 °C, compared to 19 °C to 25 °C with ordinary grouts. Hence, PCM integration in grouts can enhance the stability of source and sink temperatures.

• Jezik: Angleški jezik
• Ključne besede: phase change material, enhanced grout, coaxial ground heat exchanger, numerical model
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 15 str.
• Številčenje: Vol. 287, [article no.] 129419
• PID: 20.500.12556/RUL-176877
• UDK: 536
• ISSN pri članku: 1873-5606
• DOI: 10.1016/j.applthermaleng.2025.129419
• COBISS.SI-ID: 261088515
• Datum objave v RUL: 12.12.2025

Gradivo je del revije

• Naslov: Applied thermal engineering
• Založnik: Pergamon Press
• ISSN: 1873-5606
• COBISS.SI-ID: 23195397

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fazno spremenljiva snov, izboljšano polnilo, koaksialni zemeljski toplotni izmenjevalnik, numerični model

Projekti

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: Italian Ministry for Universities and Research
• Številka projekta: FSE REACT-EU CUP 165F21001390001
• Naslov: Doctoral Research Funding for Green Themes

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0162
• Naslov: Večfazni sistemi