Ground and solar assisted heat pump systems for space heating and cooling applications in the northern region of India – A study on energy and CO2 saving potential

Investigation of the Long-Term Performance of Waste Backfill Materials of High Thermal Conductivity in Vertical Ground Heat Exchangers

“…Considering that heat transfer between the buried pipe and the ground is a complex, unsteady process, some hypotheses are needed: (1) Backfill material and the surrounding soil are considered to be homogenous and isotropic [26,27]; (2) the backfill material in the borehole has been fully backfilled [26]; (3) All the contacting boundaries satisfy the continuity condition, in which the thermal resistance is ignored [27]. As the influences of groundwater seepage and a lack of groundwater seepage on heat transfer are considered separately in this paper, more hypotheses are proposed as the groundwater seepage is taken into consideration: (1) The flow state of groundwater in porous media conforms to Darcy's law; (2) The entire soil around the borehole is assumed to be a porous medium composed of three phases: solid, liquid, and gas; (3) The initial groundwater temperature in the model is set to be the same as the stratum temperature; (4) The velocity of the groundwater seepage is constant.…”

“…With the rapid development in urbanization and industrialization, geothermal energy has become widely used as a renewable energy source for cooling or heating in multiple fields, in which the ground source heat pumps (GSHPs) system has been widely developed due to its advantages of energy saving, free environmental pollution, and low operational cost [1][2][3]. As an important heat-exchange device for GSHPs, the heat-transfer performance of buried ground heat exchangers (GHEs) directly affects their efficiency.…”

Simulation and Performance Analysis of an Air-Source Heat Pump and Photovoltaic Panels Integrated with Service Building in Different Climate Zones of Poland

“…In view of the high energy, economic and environmental potential of combining different types of renewable energy sources [5,6], many hybrid solar-assisted heat pump installations have also been studied and analyzed in recent years [7], both for heating and cooling [8][9][10], as well as for domestic hot water preparation [11][12][13], in different types of buildings [2,14] located in different climatic and ambient conditions [15][16][17][18][19].…”