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WASTEWATER-HEAT RECOVERY IN PRACTICE DECARBONISED HEATING AND COOLING OF LARGE BUILDINGS
Pál KISS
managing director
THERMOWATT Ltd.
BULAQUA 2017 – BWA Sofia – 4th April 2017
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THERMOWATT LTD.
o Established in 2007, in Budapest (Hungary) specifically for energy utilization of
waste-heat.
o Activities:
• Utilization of communal wastewater and thermal water for heating and cooling
• Energy consultation
• Installation of gas engines (preferably biogas engines)
o Co-operating partners:
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DIRECTIONS TO GROW
PRESENT:
o Running systems and 24/7 operation more than 6 years experience in
operation and installation
o Continuous research, adjustments and fine tuning to improve the system
o Preliminary studies, several project-preparations
o Presence on international markets: project company in the UK; agents
(France, Benelux, Austria; Kuwait, Egypt: contracting in process), close
cooperation (Canada, Vietnam, Malaysia, Thailand, Bulgaria, Romania, Czech
Republic, Germany, Singapore)
FUTURE PROSPECTS:
o Close cooperation under negotiation: UAE, Spain, India, Mexico, China, Brasil
o ISLE Utilities (technology transfer to waterworks) – US, UK, EU, Australia
o Remote supervision, technical assistance for operation of systems implemented
abroad
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INVENTION OF THE TECHNOLOGY
o Developed a technological solution to harness and utilize energy resided in
wastewater to cool and/or heat buildings in a modern, environment-friendly and
economical fashion.
o “Method and Circuit Arrangement for Recovering Heat from Wastewaters”
• Hungarian Patent – granted, protection since 2010
• International Patent (PCT) – applied for in 2011
• Russian, Ukrainian Patent - granted
o International Innovation Award winner technology:
* Aqualia Award for Innovation 2013 and
* Water&Energy Award 2014
at WEX Global – Water Energy Exchange
* First Place Innovator in the Water for Real Estate Sector
at the Innovate@IWS 2015 in Abu Dhabi
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THE THERMOWATT TECHNOLOGY
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THE THERMOWATT TECHNOLOGY – FEATURES OF A HEAT PUMP SYSTEM
o Suitable for water heating systems
up to 63 °C and for practically any
cooling system
o Air-air, air-water heat pumps are
less efficient
o Uses electricity
o Continual efficiency growth of the
equipment
o The efficiency of systems can be
improved by adjusting them to the
given location (thermal water, pool,
waste heat, etc.)
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THE THERMOWATT TECHNOLOGY – COMPARING HEAT SOURCES
The efficiency (COP) is directly proportional to the temperature difference
between the heat source and the destination.
Given its constant favourable temperature the optimal heat source is the wastewater.
Heat source Temp. [°C] Weather
dependence
air - highly
surface water 2-26 medium
under surface water 8-12 slightly
soil 5-16 slightly
wastewater 15-20 non
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THE THERMOWATT TECHNOLOGY – TECHNOLOGICAL PROCESSES
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THE THERMOWATT TECHNOLOGY – PROCESS FLOW DIAGRAM
P
U
B
L
I
C
S
E
W
E
R
Heat exchangers
Wastewater screening
Heat pumps
Heating/cooling system of the building
Wastewater inlet
Wastewater outlet
Screened
wastewater
inlet
Sludge
Screened
wastewater
outlet
Forward
flow line
(refrigerant)
Return
flow line
(heating or
cooling)
Forward
flow line
(heating or
cooling)
Completely sealed system: no unpleasant smell or hazardous waste!
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EARLIER TECHNOLOGIES OF HEAT RECOVERY
Disadvantages of competing
technology:
o More expensive installation
o Less efficient heat transfer
o Existing network must be changed
o High pressure drop - Increased pumping costs
o Smaller energy demands can be serviced
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THE THERMOWATT TECHNOLOGY – INNOVATIONS
o No applications installed inside the sewer
o Larger energy demands can be accomodated for - heating/cooling power
gained: 1MW and over!
o Compact size easier placement
• Fully underground, deep garage, over ground in a unused building
o Installation in city centres
o Carefully designed devices (screening, heat exchange, heat storage)
• sufficient for working with wastewater
• high durability
o System elements are optimised and harmonised
o Specific software developed for easier operation
• remote supervision (24/7)
• alarm for system-irregularities
• several adjustments in the operation of the system can be easily made
according to end users’ requirements
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BUDAPEST
SZEGED
ACTIVE REFERENCE PROJECTS AND THEIR OPERATION IN HUNGARY • MOM CULTURAL CENTRE (8,600 M2, 1 MW)
• BUDAPEST SEWAGE WORKS PREMISES – OFFICES&WAREHOUSE ( 9,000 M2, 1 MW)
• MH EK MILITARY HOSPITAL (40,000 M2, 600 LITS, 3.8 MW)
• UNIVERSITY OF SZEGED (25,000 M2, 1.4 MW)
• BUDAPEST SEWAGE WORKS PREMISES – FERENCVAROS (16,000 M2, 1.2 MW)
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1. MOM CULTURAL CENTER – PROJECT TECHNICAL DATA
o Flow of wastewater: 90 m3/h
o Average temperature of wastewater: 15-17°C
o Temperature of return wastewater (heating): 10°C
o Temperature of return wastewater (cooling): 25°C
o Heat Pump capacity in heating mode: 645.8+569= 1214.8 kW
o Heat Pump capacity in cooling mode: 567.4+505= 1072.4 kW
o COP: 6.78-8.24
o Δ T (heating) : 35/20°C
o Δ T (cooling) : 6/16°C
o Flow of water (heating): 25+25 m3/h
o Flow of water (cooling): 25+13 m3/h
o Power demand (above the demand of heat pump): 43 kW
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COMPLETION OF THE IMPLEMENTATION PHASE - SYSTEM IS IN OPERATION AND UNDER MONITORING SINCE APRIL 2011
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2. BUDAPEST SEWAGE WORKS – PROJECT TECHNICAL DATA
o Flow of wastewater: 140 m3/h
o Average temperature of wastewater: 17°C
o Temperature of return wastewater (heating): 10°C
o Temperature of return wastewater (cooling): 25°C
o Heat Pump capacity in heating mode : 552 + 540 = 1092 kW
o Heat Pump capacity in cooling mode : 557 + 557 = 1114 kW
o Efficiency: EER: 6.92 COP: 4.40
o Δ T (heating) : 59/45 °C
o Δ T (cooling) : 7/12 °C
o Flow of water (heating): 69 m3/h
o Flow of water (cooling): 109 m3/h
o Power demand (above the demand of heat pump): 36 (30) kW
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COMPLETION OF THE IMPLEMENTATION PHASE - SYSTEM IS IN OPERATION AND UNDER MONITORING SINCE NOVEMBER 2012
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3. MILITARY HOSPITAL (BUDAPEST) PROJECT TECHNICAL DATA
o Flow of wastewater: 480 m3/h
o Average temperature of wastewater: 17°C
o Temperature of return wastewater (heating): 10°C
o Temperature of return wastewater (cooling): 25°C
o Heat Pump capacity in heating mode : 1790 + 2065 = 3855 kW
o Heat Pump capacity in cooling mode : 1663 + 1640 = 3303 kW
o Efficiency: COP: 7.38 EER: 6.5
o Δ T (heating) : 32/22 °C
o Δ T (cooling) : 6/12 °C
o Flow of water (heating): 330 m3/h
o Flow of water (cooling): 420 m3/h
o Power demand (above the demand of heat pump): 95 (110) kW
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COMPLETION OF THE IMPLEMENTATION PHASE - SYSTEM IS IN OPERATION AND UNDER MONITORING SINCE JULY 2014
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COMPLETION OF THE IMPLEMENTATION PHASE - SYSTEM IS IN OPERATION AND UNDER MONITORING SINCE JULY 2014
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COMPLETION OF THE IMPLEMENTATION PHASE - SYSTEM IS IN OPERATION AND UNDER MONITORING SINCE JULY 2014
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4. UNIVERSITY OF SZEGED - SYSTEM IS IN OPERATION AND UNDER MONITORING SINCE SEPTEMBER 2015
o Flow of wastewater: 136 m3/h
o Average temperature of wastewater: 17°C
o Temperature of return wastewater (heating): 10°C
o Temperature of return wastewater (cooling): 25°C
o Heat Pump capacity in heating mode : 1559 kW
o Heat Pump capacity in cooling mode : 1204 kW
o Efficiency: COP: 4.76 EER: 4.25
o Δ T (heating) : 45/30 °C
o Δ T (cooling) : 7/13 °C
o Flow of water (heating): 70 m3/h
o Flow of water (cooling): 212 m3/h
o Power demand (above the demand of heat pump): 39 kW
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o Flow of wastewater: 240 m3/h
o Average temperature of wastewater: 17°C
o Temperature of return wastewater (heating): 10°C
o Temperature of return wastewater (cooling): 25°C
o Heat Pump capacity in heating mode : 1232 kW
o Heat Pump capacity in cooling mode : 1204 kW
o Efficiency: COP: 3.62 EER: 6
o Δ T (heating) : 63/50 °C
o Δ T (cooling) : 7/12 °C
o Flow of water (heating): 83 m3/h
o Flow of water (cooling): 105 m3/h
o Power demand (above the demand of heat pump): 58 kW
5. BSW – FERENCVAROS - SYSTEM IS IN OPERATION AND UNDER MONITORING SINCE NOVEMBER 2015
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PROJECTS IN PROGRESS DOMESTIC:
• UNITS OF ST. STEPHAN SQUARE, Budapest (under construction) • Investor: Municipality
• Buildings supplied: Market buildings, Mayor’s office, Government offices
• Project size: 1st phase: 1.7 MW, 2nd phase: extending to a total of 4 MW
• CONGRESS CENTRE, Budapest • Project size: 8 MW
• DUNA MEDICAL CENTER • Project size: 1st phase: 2 MW, 2nd phase: extending to a total of 4 MW
INTERNATIONAL:
• APA NOVA BUCURESTI – new HQ building (Bucharest, Romania) • Investor: Apa Nova
• Size: 2 MW
• LAKEVIEW WWTP (Ontario, Canada) • Investor: Peel Region
• Size: 4 MW
• Potential development of a 20 MW district heating system
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INVESTMENT IN NUMBERS
IN GENERAL
o Investment cost:
• 1MW ~ 1 million EUR
• No size limit - investment cost does not increases proportionally
o Return on investment (ROI):
• Retrofitting: 8-10 years a saving of 120 000 EUR/year
• New construction: 3-4 years!
o Savings:
20-40% saving on energy costs/year for the end user
o Project financing
• Investor: end user, third party investor, ESCO
• possible subsidies
o Annual income (access fee) for the operator (public utility, waterworks, etc.)
o Long term operation and maintenance contract
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PROJECT POTENTIAL
POTENTIALS
o Bulgaria (counting with an average overall wastewater production per capita)
• population: 7.3 million ~ 750 MW
• Sofia: 1.2 million ~ 130 MW
CASE STUDIES – An ideal project
o design phase of the structure, location is in/or near the city centre
o LARGE buildings: high and continuous energy need
• Hospital, Hotel, Shopping Mall, Data centre, Industrial Park, WWTP, etc.
o continuous cooling and/or heating requirement, or both simultaneously
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RETROFITTING VS. NEW CONSTRUCTION
HEATING AND
COOLING
WITH
THERMOWATT
TECHNOLOGY
HEATING AND
COOLING
WITH
STANDARD
TECHNOLOGY
Heat Pump/Liquid Chiller 120 000 € 120 000 €
General mechanical and
electrical installation 450 000 € 450 000 €
Heating boiler with chimney ---- 65 000 €
Waste water management
machinery 72 000 € ----
Waste water - primary water
heat exchanger battery 110 000 € ----
Thermowatt specific
mechanical and electrical
installation 250 000 € ----
Total 1 002 000 € 635 000 €
Extra cost for Thermowatt
technology for new facilities 367 000 €
0 €
200 000 €
400 000 €
600 000 €
800 000 €
1 000 000 €
1 200 000 €
Thermowattspecificmechanical andelecricalinstallation
Waste water -primary waterheat exchangerbattery
Waste watermanagementmachinery
Heating boilerwith chimney
Generalmechanical andelectricalinstallation
HeatPump/LiquidChiller
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ECONOMIC ADVANTAGES – LONG TERM SUSTAINABILITY
o The heating and cooling costs of a building are significantly lower and energy
savings are guaranteed because of the energy efficiency (COP) of this system
o Energy Directives require increasing usage of renewable energy sources, which
makes operating a wastewater based system much more favourable
o In the case of rental properties its “Green” character would make selling and/or
long term renting, leasing more favourable
o The PR value provides a more competitive position
o Long term agreements with the main operators of the sewage network
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CO-OPERATION
EXPECTATIONS:
o Demonstrate a great technology solution, inspire “sponsors” for the Technology
o Looking for partnership and cooperation as well as potential customer, investor
o Learn local market specifications and ways of doing business and developing
projects
NEXT STEPS:
o Locating possible project sites - cooperation in project-quest
o Organizing initial meetings, technical assistance for preliminary studies
o Recruiting suitable constructor/operator companies
o Attracting capital for investments (possible subsidies), signing agreements on
project implementation
FUTURE:
o PROJECTS, PROJECTS, PROJECTS
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Contacts:
Pál KISS
managing director
www.thermowatt-global.com
THANK YOU FOR YOUR ATTENTION!