Combination of Solar Thermal Collectors and Horizontal Ground Heat Exchangers as Optimized Source for Heat Pumps

2016 ◽  
Author(s):  
Fabian Hüsing ◽  
H Hirsch ◽  
G Rockendorf
Keyword(s):  
Heat Exchangers ◽  
Heat Pumps ◽  
Solar Thermal ◽  
Ground Heat Exchangers ◽  
Solar Thermal Collectors

scholarly journals The energy source for heat pumps with vertical heat exchangers

2018 ◽  
Vol 44 ◽  
pp. 00157
Author(s):  
Piotr Rynkowski
Keyword(s):  
Heat Pump ◽  
Heat Exchangers ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Temperature Analysis ◽  
Heat Flows ◽  
Ground Heat Exchangers ◽  
Vertical Heat ◽  
Vertical Ground

The paper presents the ground temperature analysis, heat flows and energy transferred from the soil massif by the vertical ground heat exchangers (VGHE). Three cases – with one, two and three vertical heat exchangers were compared. Their influences on the soil massif temperature in the heat exchangers area were shown. The mass flow and the temperature at the inlet and outlet side of the heat pump were measured in each circuit. Additional, the electricity consumption by the heat pump and energy supply to buffer vessel were measured. Finally, the Coefficient of Performance (COP) as a function of length of VGHE is shown for selected interval time.

scholarly journals Solar Thermal Regeneration of Borehole Heat Exchangers in Urban and Suburban Districts

2021 ◽  
Vol 2042 (1) ◽  
pp. 012094
Author(s):  
David Sauter ◽  
Manuel Hunziker ◽  
Joachim Poppei ◽  
Fabien Cochand ◽  
Markus Hubbuch ◽  
...  
Keyword(s):  
Flat Plate ◽  
Heat Exchangers ◽  
Urban Areas ◽  
Heat Pumps ◽  
Solar Thermal ◽  
Thermal Regeneration ◽  
Urban Neighbourhoods ◽  
Heat Demand ◽  
Roof Area ◽  
Borehole Heat Exchangers

Abstract To prevent undercooling of the ground in densely populated areas, regeneration of borehole heat exchangers (BHEs), for example by solar thermal heat, may become necessary. However, the usable roof area is often small compared to the building’s heat demand, especially in urban areas. It was investigated how much regeneration is possible in districts that are supplied entirely by heat pumps with BHEs. Example buildings were modelled based on the buildings of two districts in Zurich. Uncovered PVT collectors and glazed flat-plate collectors were used as regeneration sources. The possible regeneration was determined in a simulation process that included the effects of mutual influences between the BHEs of neighbouring buildings. As expected, glazed flat-plate collectors allow for more regeneration than uncovered PVT collectors. For full regeneration, the required usable roof area relative to the annual heat demand is about 1.8m2/MWh for PVT and 1.2m2/MWh for flat-plate collectors. Large buildings often do not provide sufficient roof area for full regeneration. A sustainable heat supply of the entire district with regenerated BHEs can be possible in suburban neighbourhoods, if the bigger buildings are distributed rather evenly. In urban neighbourhoods, areas may exist in which solar thermal regeneration alone is not sufficient.

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