Entwicklung einer allgemeinen Bewertungsmethode fuer Heiz- und Trinkwassererwaermungssysteme am Beispiel einer Wohnung in einem Mehrfamilienhaus

Building energy efficient houses results in new boundary conditions for heating systems. Therefore new heating systems need to be developed especially for flats and residential buildings where small heating systems are used. In publications on energy efficient housing experiments there are no criteria to be found which lead to the decision on the installation of specific heating systems. There exists also no recognizable optimally suitable system. This thesis introduces a procedure not only for energy evaluation but also for multiple evaluation, conception and selection of heating systems. The procedure enables to select the most suitable heating system in followable decision steps and by setting up values of utility. The procedure is applied to find a heating system for a flat in a multi-family house with an energy demand corresponding to the German 'Waermeschutzverordnung 1995' and for one which corresponds to the energy efficient building insulation standard. During the first evaluation step a number of possible heating systems are excluded as they do not reach the required aims; for the second evaluation step a hot air heating system, a hot water radiator heating system, a floor heating system, an electric storage heater and an electric blow heater remain. The highest value of utility is reached by the hot water radiator heating system for which several concepts are developed. These concepts are mathematically simulated using newly created computer simulation models. Not only the unsteady state behaviour of the building is simulated, but also the complete heating system and its interaction with the building. In order to optimize the heating system the influence of the controlling values, of the power of the heater including hot water heating, of various sizes and modes of operation of the hot water storage tank and the heating water storage tank as well as the pump and the pipes is examined. In the last evaluation step the best system is assessed. It is the heating system with the heater, which is dimensioned to serve up to twice the nominal heating load without a heating water storage tank and with a hot water storage tank which is loaded in the morning before heating starts. (orig.)Available from TIB Hannover: RR 6940(2) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman