Central Solar Plant with a Seasonal Duct Storage. Dynamic Thermal Simulations of the Overall System Intermediate report E1 to the final report E Gesamtsystemoptimierung

Pahud, Daniel (1999) Central Solar Plant with a Seasonal Duct Storage. Dynamic Thermal Simulations of the Overall System Intermediate report E1 to the final report E Gesamtsystemoptimierung. Project Report. UNSPECIFIED.

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Abstract

This work has been carried out in the framework of the research project “Saisonale Speicherung von Sonnenenergie im Erdboden zur Wärmeversorgung von grösseren Überbauungen”. This research project was mandated by the Swiss Federal Office of Energy (OFEN). It is carried out by the Zurich University of Applied Sciences, Winterthur, in collaboration with the Laboratory of Energy Systems (LASEN) of the Swiss Federal Institute of Technology (EPFL). The objective of this report is to archive the work performed at the LASEN in the task 5 of the research project, “Gesamtsystemoptimierung”, and to provide a synthesis of the results obtained. Nowadays, the necessary investment for the build up of a solar collector field with a heat storage makes the cost of the heat too expensive if a large fraction of the annual heat demand is to be covered with solar energy. One of the main goals of the research project is to find out different ways of improving the conception of a central solar heating plant with a seasonal storage, in order to make such a system more attractive on the economical point of view. The use of a heat pump is not considered in this project. This type of system provides heating and hot water to buildings whose total annual heat demand is greater than 106 MJ/year (> 300 MWh/year). The main objective of the task 5, “Gesamtsystemoptimierung”, is to find out an adequate system layout and to optimise the overall system (solar collector array, buffer store, duct store, heat distribution and system control) for two situations: renovation of buildings and new buildings with a high level of insulation. The results given in this report deal with the definition of the system layout and control, some improvements of the system control strategy, the analysis of the concept of a hot water subsystem and the optimisation of six different cases. Finally, some design guidelines are given in order to quickly pre-size such a system.

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