TY  - JOUR
A1  - Göttsche, Joachim
A1  - Gabrysch, K.
A1  - Schiller, H.
A1  - Kauert, B.
A1  - Schwarzer, Klemens
T1  - Energetic Effects of demand – controlled ventilation retrofitting in a biochemical laboratory building
JF  - AIVC publications [Elektronische Ressource] / Air Infiltration and Ventilation Centre
Y1  - 2004
N1  - AIVC Conference <25, Prague, 2004>
SP  - 50
PB  - INIVE EEIG
CY  - Brussels
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Gabrysch, K.
A1  - Delahaye, A.
A1  - Schwarzer, Klemens
T1  - Solar-Campus Juelich - Energy performance and indoor climate
JF  - AIVC 23rd conference - EPIC 2002 AIVC (in conjunction with 3rd European Conference on Energy Performance and Indoor Climate in Buildings) - 23-26 October 2002 - Lyon - France - vol 2
Y1  - 2002
SP  - 381
EP  - 386
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Alexopoulos, Spiros
A1  - Dümmler, Andreas
A1  - Maddineni, S. K.
T1  - Multi-Mirror Array Calculations With Optical Error
N2  - The optical performance of a 2-axis solar concentrator was simulated with the COMSOL Multiphysics® software. The concentrator consists of a mirror array, which was created using the application builder. The mirror facets are preconfigured to form a focal point. During tracking all mirrors are moved simultaneously in a coupled mode by 2 motors in two axes, in order to keep the system in focus with the moving sun. Optical errors on each reflecting surface were implemented in combination with the solar angular cone of ± 4.65 mrad. As a result, the intercept factor of solar radiation that is available to the receiver was calculated as a function of the transversal and longitudinal angles of incidence. In addition, the intensity distribution on the receiver plane was calculated as a function of the incidence angles.
KW  - solar process heat
KW  - concentrating collector
KW  - raytracing
KW  - point-focussing system
Y1  - 2019
SP  - 1
EP  - 6
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
T1  - Eldorado summer schools
JF  - Progress in solar energy education. 3 (1994)
Y1  - 1994
SN  - 1018-5607
SP  - 31
EP  - 33
ER  - 
TY  - JOUR
A1  - Blanke, Tobias
A1  - Hagenkamp, Markus
A1  - Döring, Bernd
A1  - Göttsche, Joachim
A1  - Reger, Vitali
A1  - Kuhnhenne, Markus
T1  - Net-exergetic, hydraulic and thermal optimization of coaxial heat exchangers using fixed flow conditions instead of fixed flow rates
JF  - Geothermal Energy
N2  - Previous studies optimized the dimensions of coaxial heat exchangers using constant mass fow rates as a boundary condition. They show a thermal optimal circular ring width of nearly zero. Hydraulically optimal is an inner to outer pipe radius ratio of 0.65 for turbulent and 0.68 for laminar fow types. In contrast, in this study, fow conditions in the circular ring are kept constant (a set of fxed Reynolds numbers) during optimization. This approach ensures fxed fow conditions and prevents inappropriately high or low mass fow rates. The optimization is carried out for three objectives: Maximum energy gain, minimum hydraulic efort and eventually optimum net-exergy balance. The optimization changes the inner pipe radius and mass fow rate but not the Reynolds number of the circular ring. The thermal calculations base on Hellström’s borehole resistance and the hydraulic optimization on individually calculated linear loss of head coefcients. Increasing the inner pipe radius results in decreased hydraulic losses in the inner pipe but increased losses in the circular ring. The net-exergy diference is a key performance indicator and combines thermal and hydraulic calculations. It is the difference between thermal exergy fux and hydraulic efort. The Reynolds number in the circular ring is instead of the mass fow rate constant during all optimizations. The result from a thermal perspective is an optimal width of the circular ring of nearly zero. The hydraulically optimal inner pipe radius is 54% of the outer pipe radius for laminar fow and 60% for turbulent fow scenarios. Net-exergetic optimization shows a predominant infuence of hydraulic losses, especially for small temperature gains. The exact result depends on the earth’s thermal properties and the fow type. Conclusively, coaxial geothermal probes’ design should focus on the hydraulic optimum and take the thermal optimum as a secondary criterion due to the dominating hydraulics.
Y1  - 2021
U6  - http://dx.doi.org/10.1186/s40517-021-00201-3
SN  - 2195-9706
N1  - Corresponding author: Tobias Blanke
VL  - 9
IS  - Article number: 19
PB  - Springer
CY  - Berlin
ER  -