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Modelling heat recovery potential from household wastewater
Summary
Wastewater heat recovery in Sweden shows significant potential, recovering 0.65 kWh per person daily. However, this process can lower wastewater temperatures by up to 4.2 °C, impacting downstream systems.
Area of Science:
- Environmental Engineering
- Sustainable Energy Systems
Background:
- Growing interest in wastewater heat recovery (WWHR) globally and in Sweden.
- Lack of tools to assess downstream temperature impacts from WWHR.
Purpose of the Study:
- To model the heat recovery potential and temperature drop of WWHR on a building level.
- To analyze a case study in Linköping, Sweden.
Main Methods:
- Building-level modeling of wastewater heat recovery.
- Case study analysis in Linköping, Sweden.
Main Results:
- Maximum temperature drop of 4.2 °C observed.
- Annual recovered heat estimated at 0.65 kWh per person per day.
- Lowest recorded wastewater output temperature of 18.0 °C during winter.
Conclusions:
- Wastewater heat recovery is feasible but requires careful management of temperature drops.
- Drinking water source type is a critical factor in WWHR planning.
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