DACHS the power at the heart of your heating system

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• DACHS the power at the heart of your heating
  system

• Yan Evans National Sales Marketing Manager

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Presentation Content

• Introduction to mini-CHP and the DACHS
• Baxi Technologies UK
• SenerTec
• History of the DACHS unit
• What is Combined Heat Power (CHP) ?
• CHP Considerations and Benefits
• What is mini-CHP ?
• Features of the DACHS
• Operational Flexibility
• Sizing CHP for Base Load Operation
• University of Nottingham
• School of the Built Environment
• Reference Sites
• DACHS Fleet in the UK
• Opportunities for Funding
• Questions

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• Division set-up and launched in September 2002
• Formed to lead Baxis development in Sustainable
  Energy Systems
• To direct and lead Baxis activities into new
  technologies
• Baxi acquisition of SenerTec and European Fuel
  Cell in 2002
• Initial focus is the DACHS mini-CHP unit
• Future developments may also include other
  technologies

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SenerTec GmbH

• Acquired by Baxi Group in March 2002
• European leader in mini-CHP
• DACHS unit manufactured in Schweinfurt, Germany
• Around 8,000 CHP units installed throughout
  Europe
• Early units have operated for over 80,000 running
  hours
• Reliable, proven technology with a strong track
  record

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History of the DACHS
Field Trials in 1987 (150 units)
1991 Demonstration Projects
March 1996 SenerTec GmbH founded
December 1996 Series Production
Acquisition by Baxi Group in March 2002
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What is Combined Heat Power (CHP) ?

• Simultaneous production of heat and generation of
  electricity from a single fuel
• Many types small-reciprocating engine based
  systems to large gas turbine and steam turbine
  derivatives (ranging from a kWe up to several
  MWe)
• Choice depends on the application
• Uses on-site generation together with heat used
  for process purposes, space heating and the
  production of hot water
• Applications include large paper mills and
  chemical plants, down to smaller properties such
  as hotels, hospitals, schools, nursing homes, and
  sheltered accommodation

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CHP Considerations and Benefits?

• Considerations
• Property / site must have the simultaneous need
  for electricity and heat
• Over extended operating periods, typically 5,000
  hours a year and above
• CHP should be sized for base load to maximise
  running hours
• Longer CHP operating hours, the greater the
  benefits
• Benefits
• Reduction in the amount of electricity imported
  from the grid
• Reduction in the amount of fuel used by other
  heating appliances
• Energy cost savings
• Large power stations generate electricity at
  around 30-40
• Much of the waste heat is lost to atmosphere
• Generating at the point of use and using the
  available heat reduces primary energy needs by up
  30
• Significant reduction in greenhouse gases such
  as CO2

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What is mini-CHP ?

• CHP often perceived as large engines or gas
  turbines
• Chemical plants, paper mills, hospitals, etc
• Perhaps hundreds of kWe or several MWe
• Mini-CHP is typically sub-10kWe electrical output
• Internal combustion engine based technology
• Low output and small footprint - offers benefits
  of CHP
• to much smaller properties e.g.
• - homes for the elderly, nursing homes
• - extra care schemes
• - sheltered accommodation
• - universities (sustainable research, energy
  centres
• and student accommodation)
• Offers an opportunity to gain valuable experience
  with CHP starting on a small-scale with lower
  financial risk stepping stone to more ambitious
  schemes

Image courtesy of Nedalo (UK) Ltd
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Features of the DACHS

• Single cylinder, 4 stroke, internal combustion
  engine
• 5.5kWe gross electrical output
• 12.5kW heat output (low temperature hot water)
• 22.8kW fuel input (Gross CV/HHV)
• Overall efficiency of 79, increasing to 92
  using an exhaust condenser
• Proven, reliable technology
• Low noise of around 52 - 56dB(A) _at_ 1 metre
• Dimensions 720mm(W) x 1090mm(D) x 1000mm(H)
• Weight 520 kg
• Gaseous and liquid fuel options available
• 3,500 run hour service intervals (gas/LPG)
• 2,700 run hour service intervals (oil)

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Operational Flexibility A Modular Approach

• Multi-unit installations possible
• Up to six DACHS operating in master /
• slave configuration

• Greater operational flexibility
• Retains optimum performance as
• avoids output modulation
• Offers increased overall reliability

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Sizing CHP for Base Load Operation

• Outputs used on site, matching base electrical
  load and base thermal load requirements
• Parallel operation with the grid network no
  export or spilling of electricity from the site
  not an attractive financial proposition
• DACHS CHP unit acts as lead boiler to maximise
  operational hours existing or new boilers to
  satisfy peak demand

Output from one DACHS CHP Unit
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University of Nottingham School of The Built
Environment
Sustainability Research Building (SRB)
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Small-Scale CHP-Cooling System

• Overview
• 2 off DACHS units, natural gas fuelled
• 5.5kWe electrical output each
• 12.5kW heat output each
• Proving electricity and space heating to the SRB
• Excess heat in the Summer used to drive an
  ejector cooling
• cycle for air conditioning
• Phd sponsored by BRE (INREB Faraday Partnership)
• Baxi Group as industrial sponsor
• Forecast Outcome
• Proto-type small-scale trigeneration product for
  domestic
• and commercial applications

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Header
Condensing Boilers (each 65kW)
M
Plate Heat Exchanger
E
Heating Circuit Pump
DACHS Circuit Pump
SRB Heating Circuit
Hydraulic Schematic
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Building 3-phase Incoming Electrical Supply
Electrical Schematic

30A MCB
G.59/1 Grid Relay Panel
3-phase Electrical Connections
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Small-Scale CHP-Cooling System

• Work Involved
• Installation of the DACHS mini-CHP Package
• - 2 off DACHS Units
• - 1off G.59./1 Grid Relay Panel c/w kWh meter
• - Gas meter c/w pulse output
• - Heat metering package c/w water flow meter,
• thermocouple and processing unit
• - Hydraulic connection to building services
• - Electrical connection to local distribution
  board
• - Flue
• Monitoring of the mini-CHP units and whole
  system
• Selection and design of the cooling system
• Economic and environmental assessment

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Reference Sites
Solaris (Blackpool Centre for the Environment)
Bracknell
Brooks House, Warwick
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BTUK DACHS Fleet
31 DACHS Units in Total in the UK 16
commissioned and operational (3 units have now
been operating for over 7,000 hours) 15 in
process of being installed or on order
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Opportunities for Funding

• Possible funding available for certain
  applications
• Limited to public sector
• Community heating schemes can be single or
  multiple properties linked
• Community Energy Programme (Energy Saving Trust)
• Utilities Energy Efficiency Commitments (EEC)
• Level of funding driven by carbon savings offered
  by the project CEP up 40 capital (ave. 27),
  10 to 20 from EEC (depends on utility)
• EAGA Partnership project feasibility studies and
  sourcing funding

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Contact Details
Yan Evans National Sales Marketing Manager Baxi
Technologies UK Tel [phone] Fax 01926
478 322 Mobile [phone] E-mail
yan.evans_at_baxitech.co.uk
Kevin Lucas Sales Engineer Baxi Technologies
UK Tel [phone] Fax [phone]
322 Mobile [phone] E-mail
kevin.lucas_at_baxitech.co.uk
www.baxitech.co.uk