The behaviour of a ground heat exchanger placed inside an embankement is analysed. As the reference state, the case of horizontal ground surface is assumed. The effect of the thickness of the coating due to the embankement is investigated. The analysis is performed numerically with the FEM code FEFLOW. The soil of the embankements is considered to be a homogeneous layer of sedimentary rock; the thermal properties are found in the literature. The ground heat exchanger is a horizontal flat panel. The embankment is built with a horizontal platform 5.50 m long and 2 m wide. The slopes are obtained by connecting different heights (1, 2, 3 m) to the soil surface with a tilt of 33° (2/3). Four cases, characterized by different height of the embankments, are analyzed, both in heating and in cooling mode. The heat transfer between the embankement and the surrounding atmosphere is simulated by means of a re-calculated heat flux, typical of a location in northern Italy.
CFD ANALISYS FOR HORIZONTAL GROUND HEAT EXCHANGERS PLACED INTO EMBANKMENTS
BOTTARELLI, Michele;PIVA, Stefano
2012
Abstract
The behaviour of a ground heat exchanger placed inside an embankement is analysed. As the reference state, the case of horizontal ground surface is assumed. The effect of the thickness of the coating due to the embankement is investigated. The analysis is performed numerically with the FEM code FEFLOW. The soil of the embankements is considered to be a homogeneous layer of sedimentary rock; the thermal properties are found in the literature. The ground heat exchanger is a horizontal flat panel. The embankment is built with a horizontal platform 5.50 m long and 2 m wide. The slopes are obtained by connecting different heights (1, 2, 3 m) to the soil surface with a tilt of 33° (2/3). Four cases, characterized by different height of the embankments, are analyzed, both in heating and in cooling mode. The heat transfer between the embankement and the surrounding atmosphere is simulated by means of a re-calculated heat flux, typical of a location in northern Italy.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
