ROLANDO , Davide

tAmong the strategies for borehole heat exchanger (BHE) field design, the Ashrae method is a powerfuland fast procedure for the prediction of the BHE field length required by the building monthly heat loadprofile. The method needs the calculation of the Temperature Penalty, a key parameter that takes intoaccount the error introduced by the...

The design of a system of Borehole Heat Exchangers (BHE) coupled to a geothermal heat pumps have to be done with a suitable dynamic model able to cope with the intrinsic time varying behaviour of the ground mass and building heat load profile. Among the models based on the solution of transient conduction equation, the Ashrae method (Kavanaugh...

tThe design of a borehole heat exchanger (BHE) field coupled to a geothermal heat pump requires a suit-able dynamic model able to take into account the intrinsic time varying behaviour of the building heatload profile and ground thermal response. In this paper a new method is proposed for the calculationof the Temperature Penalty, the key...

Ground-coupled heat pump (GCHP) systems very often employ vertical borehole heat exchangers (BHE) which are in charge of extracting or injecting heat from and to the ground by exploiting the conductive properties of the soil. The ground-to-BHE-field thermal interactions are a complex transient phenomenon that requires the knowledge of the...

The exploitation of low enthalpy geothermal resources for building heating and cooling purposes represents an important opportunity for saving energy in the domestic and service sectors, that cover about 30% of the demand of primary energy in the European Union. Vertical Borehole heat exchangers (BHE) are the most frequently adopted...

The Ashrae method (Kavanaugh and Rafferty) is one of the few engineering models that allows a system Borehole Heat Exchangers (BHE) to be quickly designed starting from the knowledge of the building thermal energy requirements. The method is based on Infinite Source solutions from ground dynamic response to a series of three heat pulses,...

This research has been devoted to the selection of the most favourable plant solutions for ventilation, heating and cooling, thermo-hygrometric control of a greenhouse, in the framework of the energy saving and the environmental protection. The identified plant solutions include shading of glazing surfaces, natural ventilation by means of...

In this paper, in order to establish the influence of the operating conditions and of the header geometry on the phase/mass distribution into parallel vertical channels, a number of flow distribution fittings have been tested with respect to a test section characterized by a horizontal header and 16 vertical upward vertical channels. The fluids...

A prerequisite for the correct design of vertical ground heat exchangers (or Borehole Heat Exchangers, BHE) for heat pump applications is the knowledge of the ground thermal properties, in particular the thermal conductivity. The Thermal Response Test is a well known experimental procedure that allows the ground thermal and the BHE thermal...

The correct design of a field of Borehole Heat Exchangers (BHE) requires the knowledge of ground thermal properties, heat pump performance and building heating and cooling demand. The sequence of heat pulses from (to) the ground by the heat pump can be described according to different time steps, from hours to months and even years. The monthly...

The Thermal Response Test (TRT) is a worldwide adopted in-situ methodology able to estimate the ground thermal conductivity and borehole thermal resistance. During the test the carrier-fluid exchanges a constant heat flux with the ground while circulating in a pilot Borehole Heat Exchanger (BHE). During a Distributed Thermal Response Test...