Papers by Michael Kolja Kölling
The paper presents results based on two standard domestic solar heating systems for six locations... more The paper presents results based on two standard domestic solar heating systems for six locations in France.
Gegenstand der hier vorliegenden Arbeit ist die Untersuchung der Kombination von Wärmepumpen mit ... more Gegenstand der hier vorliegenden Arbeit ist die Untersuchung der Kombination von Wärmepumpen mit einer thermischen Solaranlage für den häuslichen Wärmebedarf. Die Untersuchung wurde in Form von Simulationen verschiedener Anlagenvarianten durchgeführt und hatte das Ziel die Systeme unter energetischen, wirtschaftlichen und ökologischen Kriterien zu analysieren. Die Arbeit soll einen Einstieg in das Thema ermöglichen und eine Einschätzung liefern, ob und wenn ja wann eine Kombination dieser beiden Technologien sinnvoll erscheint.
Other by Michael Kolja Kölling
This work aimed on the simulation of Fresnel-collectors and the production of process steam. The ... more This work aimed on the simulation of Fresnel-collectors and the production of process steam. The steam is either generated directly within the collectors or indirectly with heating up water under high pressures and generating steam in an evaporator via heat transfer. Therefore simulation models were developed and validated with measured data. The investigated evaporation temperature ranges between 100 and 200°C.
There was a good match between the simulated and the measured collectors. The congruence between the steam drum and the model was good only on four of ten measured days. The evaporator could not be validated because there were no measured data for the evaporator available.
The simulations show that the differences between the two methods depend essentially on the heating up phase of the system and therefore the steam production starts a lot earlier in the direct steam systems compared to the indirect steam system. This is due to the smaller thermal mass in the systems with direct steam generation. When the systems have reached the evaporation temperature the difference between direct and indirect steam generation is small and the direct steam systems produce then around 2 – 3 % more steam.
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Papers by Michael Kolja Kölling
Other by Michael Kolja Kölling
There was a good match between the simulated and the measured collectors. The congruence between the steam drum and the model was good only on four of ten measured days. The evaporator could not be validated because there were no measured data for the evaporator available.
The simulations show that the differences between the two methods depend essentially on the heating up phase of the system and therefore the steam production starts a lot earlier in the direct steam systems compared to the indirect steam system. This is due to the smaller thermal mass in the systems with direct steam generation. When the systems have reached the evaporation temperature the difference between direct and indirect steam generation is small and the direct steam systems produce then around 2 – 3 % more steam.
There was a good match between the simulated and the measured collectors. The congruence between the steam drum and the model was good only on four of ten measured days. The evaporator could not be validated because there were no measured data for the evaporator available.
The simulations show that the differences between the two methods depend essentially on the heating up phase of the system and therefore the steam production starts a lot earlier in the direct steam systems compared to the indirect steam system. This is due to the smaller thermal mass in the systems with direct steam generation. When the systems have reached the evaporation temperature the difference between direct and indirect steam generation is small and the direct steam systems produce then around 2 – 3 % more steam.