Abstract
Grey water heat recovery (GWHR) is one of the significant opportunities for energy savings in student dormitories and seeks to meet the EU environmental strategy. This article performs the results of temperature and flow rate measurements carried out for domestic hot water consumption for two student dormitories in Wroclaw. An energy analysis was carried out for the measurement data with and without circulation system to assess the energy savings from grey water. Results ensure that GWHR system allows to save 53% of the energy in these buildings.
Highlights
More than 504 student dormitories serve for over than 136,905 students in Poland
The analysis estimated the energy savings resulting from the use of Grey water heat recovery (GWHR) system in relation to the total energy needed to prepare DHW in student dormitories located in Wroclaw
These savings depend on the amount of DHW consumption and on the number of people
Summary
More than 504 student dormitories serve for over than 136,905 students in Poland. Theoretically, it gives 5476200 litres of DHW per day and the same amount of wastewater is discharged directly into the sewerage system, which results in large energy losses. In order to estimate these energy savings from sewage discharged water, the temperature and the DHW consumption should be determined from in the building, to assume the appropriate heat recovery system [4]. In Poland, the share of unconventional energy in total energy consumption is growing year on year, but coal is still the main source of energy for district heating systems and DHW From this point of view, GW should be seen as a problem but as an opportunity to recover significant amounts of waste heat energy, which can be effectively recovered and used to heat domestic water and heat indoor spaces. The use of appropriate technology (heat exchangers and heat pumps) in student dormitories together with a building automation system will enable the transition to a more sustainable energy supply, supporting the strategy for heating and cooling as well as DHW preparation. Weaknesses and strengths of GW heat recovery system in student dormitory are discussed in the SWOT analysis on Fig. 1
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