Betriebsverhalten freier Heizflächen unter zeitlich variablen Randbedingungen
Aachen / E.ON Energy Research Center, RWTH Aachen University (2017) [Book, Dissertation / PhD Thesis]
Page(s): 1 Online-Ressource (xxiii, 143 Seiten) : Illustrationen, Diagramme
New and innovative strategies for the control of room temperature in heating systems need to be developed to reduce the high energy consumption for the heat supply in german households. For this purpose this thesis describes a test bench that reproduces the hydraulic network of a flat including the heat supply for the rooms on a laboratory scale. The challenge is to reproduce the dynamic behaviour of the room temperature variations in controlled and time variant boundary conditions.For the realistic reproduction of the operating behaviour the radiators and control valves under test are installed in the test bench as hardware. To reduce the space requierements, the room volume around the radiator is decreased. The challenge is to convert the heat transfer processes between radiator and room from a room with normal sized dimensions into the reduced volume (cabin). The necessary conversion rules are defined in this thesis by using theoretical considerations and analyses of experiments about the radiative and convective heat transfer between room and cabin. Measurements about the dynamic behaviour of radiators in a reference room are used for the validation of the test bench concept with reduced space.The emulation of the time variant boundary conditions is realized by coupling the test bench with a simulation model, a so called Hardware-in-the-Loop system (HiL). The simulation model calculates the behaviour of a normal sized room. The following parameter describe the systemboundaries between hardware and simulation and are used for the conversion: (1) the measured heat output of the radiator and (2) the simulated roomand wall temperatures. For ensuring a succesful implementation of the test bench concept, a system for the control of the room temperature inside the cabins is examined. By adapting the volume flow of the heating medium, the heat supply into the room is affected and the room temperature can be controlled. The dynamic response of the conditions in the heated rooms can be reproduced with the described concept of the reduced volumes. This means that within future projects new developed systems and components can be tested inside the test bench and compared with existing systems under controllable boundary conditions.