422 - Solar Water Preheating for Open District Heating Nets: CIS Potential

摘要

In heat and power plants with so-called open district heating nets, large quantities of cold water (e.g. 12°C) are heated up to supply temperatures (e.g. 60°C) using fossil fuels. This water, however, can be effectively preheated by uncovered collectors before heating up conventionally to the supply temperature. Due to high basic load, low inlet temperature and good climatic conditions in most parts of the Commonwealth of Independent States (CIS), extraordinary solar gains and very low solar heat costs can be achieved during the frost-free season. The objective of this investigation is to identify heat and power plants in the CIS which are appropriate for solar water preheating. For this purpose, large (or central as it is called in the CIS) operated heat and power plants were identified and evaluated. It was found that 38 out of 197 heat and power plants are in principle appropriate for this kind of solar thermal technology. In addition, this study includes an economic analysis of the technology based on previous experimental and theoretical results. Solar heat costs of less than 0.01 €/kWh_(th) and a payback time of about 9 years are expected.