Bachelor's thesis Sebastian Krause

 

Development of a dynamic simulation model of an absorption chiller and a suitable control strategy

Simulation results using the characteristic equations for COP and cooling capacity of a 10 kW absorption chiller compared to measurement results, plotted over the generator inlet temperature Copyright: EBC Simulation results using the characteristic equations for COP and cooling capacity of a 10 kW absorption chiller compared to measurement results, plotted over the generator inlet temperature

The demands placed on efficient, environmentally friendly and reliable building and air-conditioning technology have been increasing steadily over the past few decades. In order to do justice to this trend, new models are needed to simulate the energy and hydraulic components and systems used, which have an improved forecast accuracy than those available so far. This is the only way to optimally design energy systems, i. e. networks of energy producers, transformers and consumers, in order to meet the requirements of sustainable energy production.

In this thesis, a dynamic simulation model of an absorption chiller and a suitable control strategy in the modeling language Modelica are developed. This model is to be used in the Zugabe-library for the simulation of hydraulic systems. The implementation of the model is carried out according to the modeling approach of the characteristic equations, which allow to calculate the heat flows to and from the refrigerating machine and also to determine the COP as well as the inlet and outlet temperatures of the heat exchangers of the refrigerating machine. Dynamic effects such as start-up, shutdown and heating processes should be taken into account. The aim of the control is to regulate a certain cold water outlet temperature by the hot water inlet temperature into the absorption chiller.