ECONOMIC FEASIBILITY OF SEWER HEAT RECOVERY IN …
16
ECONOMIC FEASIBILITY OF SEWER HEAT RECOVERY IN AMSTERDAM. A CASE STUDY PRESENTER: J. A. ELIAS MAXIL S. NAUFFAL MONSALVE S. S. M. MOL L. RIETVELD DELFT UNIVERSITY OF TECHNOLOGY WATERNET 1
Transcript of ECONOMIC FEASIBILITY OF SEWER HEAT RECOVERY IN …
ECONOMIC FEASIBILITY OF SEWER
HEAT RECOVERY IN AMSTERDAM.
A CASE STUDY
PRESENTER: J. A. ELIAS MAXIL
S. NAUFFAL MONSALVE
S. S. M. MOL
L. RIETVELD
DELFT UNIVERSITY OF TECHNOLOGY
WATERNET
1
BACKGROUND INFORMATION
The municipality of Amsterdam has set a goal to reduce 40% the Greenhouse Gas emissions (from 1990) by the year 2025
3000 ktonsCO2eq/a
The substitution of fossil fuels by renewable sources is one method to achieve this goal
Sustainable energy sources can avoid the use of 1900ktonsCO2eq/a
Background
20 200 400
City Heating/ATES
Biomass
Wind
Energy from waste
Cogeneration
Solar
10^6 kgCO2eq/a
Potential reduction of CO2 by sustainable
sources in Amsterdam (2009)
Potential 2025 Realized 2007
Some of it is thermal
energy In the
Urban Water Cycle
ATES: Aquifer Thermal Energy Storage
ENERGY IN THE URBAN WATER CYCLE
Source 106
Theoretical CO2 reduction by using heat from Urban Water
Background
80% of energy in the
UWC is heat (sensible)
Source 106
kgCO2eq/a
Surface water 40
Wastewater 40
Water from
shower
100
Groundwater 25
Drinking water 30
Total 235
3
HEAT RECOVERY PROJECTS IN AMSTERDAM
Energy (cold) from deep water Energy from ground water
Background
4
• For cooling in summer, heating in
winter
• CO2-reduction up to 50-70% (compared with conventional
technologies)
• 80 projects are already installed
• They avoid the use of 23,000 tons CO2-eq/year
• The technology removes phosphate from the water during
abstraction
• CO2 reduction of almost 20,000 tons CO2-eq/year (compared with
conventional technologies)
• Cooling is a more energy
consuming process than heating
POTENTIAL PROJECTS IN AMSTERDAM
Energy from drinking water Energy from wastewater
Background
5
• In summer
• For ATES regeneration
• Higher comfort
• Lower microbiological risks
• 80% of energy in the UWC is in the form of heatafter water use
• Main equipment: Heat exchanger & Heat pump
• Beneath and near costumers• There are project in operation in some countries
• Feasibility studies in The Netherlands
• Best zones for heat recovery in Amsterdam?
• Temperature of wastewater in Amsterdam?
ATES: Aquifer Thermal Energy StorageUWC: Urban Water Cycle
OBJECTIVES
To identify potential zones for heat recovery from wastewater
• The selection of the most appropriate zone for monitoring
To quantify the available heat in selected zones To quantify the available heat in selected zones
• Temperature and flow measurements for one case
• Temperature measurements and flow estimation (run-off model) for case study
Business case study
6
ZONE IDENTIFICATION
• Heat Offer
• Demographic Density
• Tourist Services
• Heat Demand
• New urban developments
Methods
• Major consumers of water
• Old ATES system
• Existing heat supply networks
• District Heating
• ATES systems in operation
7
ZONE SELECTION
• Pipe Diameters ≥ 400 mm
• Typology: Residential areas
• Long sewer pipes without connections
Areas with no developments
Methods
• Areas with no developments
• No heat supply networks in the area
• Flow ≥ 10 L/s
8
FLOW AND TEMPERATURE
Flow measurementsTemperature measurements
Methods
Flow estimations
9
ZONE 14
ZONE 2
POTENTIAL ZONES IDENTIFICATION AND SELECTION
Results
Flow measured here
ZONE 5
ZONE 3
ZONE 11
Selected zones
Monitored
Business case
10
16
14
TEMPERATURE MEASUREMENTS
ZONE 14
ZONE 2
ZONE 5
ZONE 2
Results
12
9
17
11
ZONE 14
ZONE 5
11
TEMPERATURE DECREASE ALONG THE SEWER
DISTANCE FROM HOUSEHOLDS
TO SAMPLING POINTS (ZONE 2)
Equipment Distance, m
T1 5,3
T2 35,8
T3 60,5
Results
T4 100,2
Temperature decrease along the sewer system according
to hour of the day
12
FLOW MEASUREMENTS AND ESTIMATION
• Besides temperature, flow was measured in zone 14
• And it was also modeled with Infoworks• Dry weather flow• Constant households discharge (130 L/d)
Comparison between measured
Results
Parameter
Measured temperature ºC 13.4
Total flow (pumping station) L/s 25.0
Measured flow L/s 15.7
Estimated flow (Model) L/s 16.9
Comparison between measured and modeled flow in infoworks
13
FLOW ESTIMATION FOR THE BUSINESS CASE STUDY
Zones 2, 3, 11
Zone 5: J. Wattstraat
• East of Amsterdam
• It is forecasted that the flow will increase 3 times when all
Results
J. Wattstraat peak-amounts in Dry
Weather Flow
increase 3 times when all developments are finished (Student rooms included)
14
CONCLUSIONSThe wastewater temperature in Amsterdam varies on
average between 12°C and 16°C but can go up to 20°C
The typology of the zone can give an idea of the presence of large warm water discharges
Wastewater temperature was measured
• Higher temperatures were found near households• Higher temperatures were found near households
• Runoff models did not estimate temperaturedecrease in sewer
Theoretical flows can be estimated using runoff models
• Accuracy and residence time must be improved
• Flow measurements are also important in order to validate the theoretical calculations
15
