Recent developments in the building sector, district heating and cooling (DHC) field, and
geothermal technology are reported here, which indicate the trends and efforts to more …

Geothermal is a renewable energy source, but this is not as often seen as other renewable
energy sources, such as solar, wind, hydro, etc. Several applications could be implemented …

Heating performance of deep borehole heat exchangers (DBHEs) is heavily impacted by its
design and operating flow rate. Here, various designs of coaxial DBHEs were numerically …

Decarbonisation of heat is essential in curbing carbon dioxide emissions and can be
achieved through the use of geothermal systems. Recently, single-well, closed-loop, deep …

Medium-depth geothermal heat pump systems (MD-GHPs) use deep borehole ground heat
exchangers (DBHEs) to extract heat from the medium-depth geothermal energy with depth …

Investigating the constructions of borehole heat exchangers with high efficiency (unit heat
transfer between the heat carrier and ground) is important. One of the means to improve …

Geothermal systems installed at intermediate depths (∼ 1–2 km) in sedimentary basins
represent an attractive option to provide low-carbon heat in cold countries, even where the …

Mid-deep borehole heat exchangers (MDBHEs) extract heat from geothermal energy with
depth of 2–3 km, and provide high-temperature heat source for heat pump heating system …

Mid-deep geothermal heat pump systems (MD-GHPs) use mid-deep borehole heat
exchangers (MDBHEs) to extract heat from the geothermal energy at a depth of 2–3 km, and …

The main topics of this Special Issue regard energy efficiency in buildings and the use of
innovative materials for design and retrofitting to pursue this goal. In developed countries …