Heat recovery from sewers for low temperature DH … Recovery from... · 3 I Degrés Bleus - Heat...

Heat recovery from sewers for low temperature DH supply

Case study of an eco-district

Marta Golisowicz, Lynne Bouchy, Gilles Bideux

Energy4PowerLive

15 November 2016

Compared with other traditional solutions, energy

recovered from sewers is :

Renewable: recovery, avoiding GHG emissions

Locally available: in all built areas

Stable: supply throughout the year

WastewaterUnlimited decentralised source of heat

2 I

Reliable availability

Capable of base load provision

Low carbon

Average annual waste water temperature is about 12-15°C

Degrés Bleus - Heat recovery from sewers2 I

Heat pump

Heat transfer network

Heat exchanger


1 meters long

Half-shell shape

Small cross section

Adaptable to different sewer shapes

Module system that can be extended

All components installed in the sewer are

made of stainless steel

Generates approx. 2 – 5 kW of useful heat

per m² of heat exchanger

Service life of at least 30 years

Heat exchanger features


Installation of in-sewer heat exchangers

Quick and easy installation.

Civil works kept to a minimum (heat exchangers modules can be inserted via a manhole).

Installation of in-sewer heat exchangers via a manhole

Source: UHRIG Kanaltechnik GmbH

Connection between building and heat exchangers


Circuit connecting boiler room with in-sewer heat exchangers

Source: UHRIG Kanaltechnik GmbH

Technical requirements (Indicative)

6 I

Average waste water flow min 12 L/s

Sewage pipe min Ø 400 mm (new)

Sewage pipe min Ø 800 mm (existing)

Length of heat exchanger

Min 9 m

Max 200 m

Sewer

Distance between heat exchanger and a HP

maximum 300 m.

Minimum heating requirement 80 kW

Minimum heat demand 800-1000 MWh/y

Maximum heating feed temperature 60°C

Building


Degrés BleusApplications

7 I

Space Heating &

Cooling

Domestic hot water

Process heat, e.g.

swimming pools and

water parks

.

Multi residential

dwellings

Local amenities

(swimming pools,

schools, offices,

leisure centres)

Applications

Central heating

District heating

New sewers

Existing sewers

End-users and stakeholders

Property developers Local authorities

Housing associations

Water utility companies


Case study

Eco-district, France


Eco-districtTransformation

Before

Industrial area hosting ECAC Fulmen batteries

factory (3.5ha)

Land contaminated with heavy metals (factory site

+ surroundings)

Factories were closed in 2005

Location

Dense urban area between old Nanterre centre and

residential areas

In close proximity to transportation hub

Close to the city centre

Before the redevelopment

Source: http://nature.nanterre.free.fr/boule.htm#genevieve


Eco-districtTransformation

Before

Industrial area hosting ECAC Fulmen batteries

factory (3.5ha)

Land contaminated with heavy metals (factory site

+ surroundings)

Factories were closed in 2005

Location

Dense urban area between old Nanterre centre and

residential areas

In close proximity to transportation hub

Close to the city centre

Low temperature district heating network,

sourcing heat from renewable sources including

wastewater)

Create new roads and pedestrian pathways

Harmonious integration of new buildings into

existing architectural context

Create a centre of urban, architectural and environmental excellence

Provide mix of affordable, and open market

dwellings

All buildings must have high thermal performance

Preserve the tranquillity of the place


Eco-districtEco-district in 2017

Source: SEMNA 2015

http://www.construction21.org/france/data/so

urces/users/5441/presentation-generale.pdf

Area : 5 ha

Last buildings (C lots) to be

commissioned in 2017

More than 700 new homes- a mix

of affordable and open-market

dwellings of high thermal

performance.

A sustainable nursery & school

able to accommodate 15 classes,

together with a recreation centre

and canteen. School building

made of renewable, bio-based

materials (mainly wood), equipped

with PV panels, cooled in the

summer by groundwater.

More than 1000m2 of commercial

floor space, retail units, cafes/bars

Lots Commissioning Floor area in m2 No. of new

homes

A2 2011 14,300 166

B3 2012 20,221 246

A1 (school) 2013 5,063 0

B1-B2 2015 11,687 157

C1-C2,C3 2017 11,178 143

Total 62,449 712


Eco-districtToday

Source: http://www.nfa.fr/nanterreSource:http://www.construction21.org/france/data/sources/user

s/5441/presentation-generale.pdf

Abdelmalek Sayad SchoolLots B1 and B2, (low energy buildings)

New Roads Very high energy performance buildings

ReferencesEco-district Sainte-Geneviève in Nanterre, France


2007:

• Energy strategy

2008:

• Technical, economic and legal feasibility study

• First two developers sign expression of interest for two

lots

2009 (3rd quarter):

• Preliminary drafts, legal consultation, fine tuning,

submission of the grant application.

• Start up of the tender for public service concession (Dec

2009 – June 2010)

2010:

• 25-year concession contract won by Engie (formerly

Cofely) and SUEZ ‘s subsidiary (July)

• Site preparation prior to construction of the boiler room

(September)

2011:

• Installation of heat network

• Installation of heat exchangers in the sewer (March)

• Installation and commissioning of gas boilers (April)

• Network commissioning

• June: First occupants mowing in (lots A2 & B3) (June)


Eco-districtDistrict heating system


The in –sewer heat exchangers output capacity equals

370kW assuming the following conditions:

Wastewater flow 115m3/h

Difference between the temperatures of wastewater

and heat transfer fluid entering the exchangers:11°C

Heat exchangers were installed in 5 sections, each one

comprising of 40 modules.

Total heat exchange area of the modules equals to 112m2

Recovered wastewater heat in 2015 = 1,337.2 MWh

Eco-districtWaste heat recovery from sewer


Place Foch

Eco-districtCommunity Heating Scheme


An egg-shaped sewer

Sewer height: 2m

Typical temp. range

(sewage): 15 – 21°C

Eco-district

Heat exchangers inside of the sewer

Source: UHRIG Kanaltechnik GmbH Note presence of pipes (within sewer) for other utilities.


Eco-district

Installation of sewer heat exchangers, Nanterre

Source: Screenshot from a TV programme, FUTUREMAG (ARTE Channel),“Heizen mit Wärmerückgewinnung” episode.

http://sites.arte.tv/futuremag/de/heizen-dank-warmeruckgewinnung-futuremag

*to watch it in French google: Se chauffer en récupérant les rejets de chaleur - FUTUREMAG – ARTE


Inspection of sewer with heat exchangers, Nanterre

Source: Screenshot from a TV programme, FUTUREMAG (ARTE Channel),“Heizen mit Wärmerückgewinnung” episode.

http://sites.arte.tv/futuremag/de/heizen-dank-warmeruckgewinnung-futuremag

*to watch it in French google: Se chauffer en récupérant les rejets de chaleur - FUTUREMAG – ARTE

Eco-district

Heat Network & Energy Centre


Eco-districtDistrict heating network

Installation designed to cover the 4,555 MWh of annual heat demand (renewables + gas).

800 meters long heat distribution network,

14 heat substations

Innovative 3-pipe heating network (separate supply pipes for DHW and space heating, common return

pipe)


Eco-districtEnergy plant in more detail

F1&F3 – Reinjection

wells

F2– Abstraction well,

flow rate :25m3/h

Plate heat

exchanger

(geothermal)

Heat pump 2 -high

outlet temperature

(Carrier 30 XW 802)

Heat pump 1- medium

outlet temperature

(Carrier 30 HXC 130)

Twin-head pump,

heat recovery

flow rate: 80m3/h

In-sewer heat exchanger along the

Georges Clévenceau Avenue

5 x 40 heat exchanger modules

Surface area of exchangers: 112m2

DHW circuit – flow

(constant temp. 63°C)

Space heating circuit –

flow

(regulated temp. 35-65°C)

Return – DHW + space

heating

(temp. 35-40°C)

Buffer

tank

1500 L

370 kW

Buffer

tank

1500 L

Gas Boilers

400 kW

200 kW

400 kW

Plate heat

exchanger

(wastewater)


Eco-district

0

100

200

300

400

500

600

700

800

Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15

MW

h

Heating loads vs. heat pumps output in 2015, MWh

Network losses DHW load Space heating load Heat pumps -output

HP2** is off

HP1* is off

*23.05.15 - 08.10.15

**10.07.15 – 24.09.15

Extra energy supplied by gas boilers


0°C

10°C

20°C

30°C

40°C

50°C

60°C

70°C

17/12/14 11/02/15 08/04/15 03/06/15 29/07/15 23/09/15 18/11/15 13/01/16

Tem

pera

ture

Date

Temperatures vs. time

Départ ECS Départ CHG Retour commun Température extérieure

Eco-districtSpace heating and DHW circuits temperatures

Outdoor temp.Common returnSpace heatingDHW

DHW

Space

heating

Return


In 2015, 54% of heat produced (2,074.5

MWh) originated from renewable

resources (19% groundwater & 35%

wastewater).

The heat pump system (geothermal +

wastewater heat recovery + compressors)

covered more than 84% of heat demand.

GHG emission reduction by 55% (488.2

tCO2eq) when compared to heat

production based solely on gas boilers* .

16%

35%19%

30%

Heat Production in 2015

Gas boilers Wastewater

Groundwater Compressors

Eco-districtWaste heat recovery from sewer

*Assumptions for gas boilers: Boiler’s net efficiency: 102%, and emission factor for natural gas (France): 234g CO2eq/ kWh (NCV)


Thank you for your attention!

Special thanks to Gilles Bideux and Arnaud Heinrich for

providing the information.


Marta Golisowicz

Email: [email protected]

SUEZ Advanced Solutions UK Ltd.

290 Aztec West

BS32 4SY

Bristol

Tel. 01454 804040

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