Master's Thesis Christian Thomas Unger


Simulation and Analysis of thermal short-term effects on district scale

This thesis was authored at the Institute for Energy Efficient Buildings and Indoor Climate at the
E.ON Energy Research Center of the University RWTH Aachen. The assignment was to do research
on thermal short-termeffects. Furthermore,an existing building model, based on the VDI 6007-1 generating
simplified models, is used to simulate the hourly heat demand of the city district research
center Jülich. The data basis of the measured values was generated by the sensors query. Skips in the
measurement series were filled with values generated through the imputation regression method.
A developed formula was used to generate a distinction between direct and indirect radiation. Furthermore
a parametric study regarding the air change per hour was conducted. The coefficient of
determination was improved from 0,8072 to 0,9179. An aging process of the sensor of the global radiation
in Jülich has been detected and could be compensated. The discret fourier transformation
considering different window functions was performed. The relative deviation on the day dependent
amplitude from 7,74 percent to 6,05 percent and year dependent from 5,93 percent to 3,93
percent has been worked out. The hypothesis of the white noise must be declined. The behaviour of
the residuals depending on the root mean square error and the standard deviation was improved by
3,94 respectively 3,49. The critical range of the white noise behaviour was left only to a small extent.