ECOs JC

							    WP5: Energy Conservation
          Opportunities

           Ljubljana Slovenia
     Julien Caillet ; Philippe Rivière




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Use of ECO forms

The ECO description should be useful in three
situations
• A pre-inspection: no visit site
=>collection of information
• An inspection: visit to the system and quick
and simple measurements
=>short visit and checklist
• An audit: involves the inspection + specialist
  checks
=>to identify where the problems and potential
  savings are
  2
HarmonAC list of ECOs  137 « actions »

 Envelope and load
 (4 families & 33 ECOs)
 Plant (6 families & 47 ECOs)
 •BEMs and control (7 ECOs)
 •Cooling equipment/free cooling (14 ECOs)
 •Air Handling/Heat recovery/Air distribution (14 ECOs)
 •Water Handling /Distribution (5 ECOs)
 •Terminal Units (5 ECOs)
 •System Replacement (2 ECOs)
 Operation & Maintenance
 (4 families & 57 ECOs)


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Example of ECO for design improvement


            AIR HANDLING / HEAT RECOVERY / AIR DISTRIBUTION

     P3.1              Reduce motor size (fan power) when oversized

     P3.2                    Relocate motor out of air stream

     P3.3                        Use a more efficient fan

     P3.4                   Use the best Eurovent class of AHU

     P3.5              Consider applying chemical de-humidification

     P3.6                   Apply variable flow rate fan control



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    Content of ECO form



1) Existing subsystems on which the ECO may
apply
2) Considered actions
3) Technical data to request to owner/manager
or to find directly (manufacturer data)
4) Technical observations to be made on site
5) Monitoring of existing situations
6) Criterion for ECO applicability
7) Recommendation for realisation of ECO
8) Additional support

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An example in the “air distribution” family

     P3.1 Reduce motor power (according to fan
           power demand) when oversized


 1 Existing subsystems on which the ECO may apply

 • {fan}+{motor}+{drive}
 • {flow adjustment device}




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An example in the “air distribution” family

Different kinds of flow rate adjustement
=> different physical effects=> different subsystems
have to be observed
 •{Subsystem 1}= {fan}+{motor}+{drive}+{mechanical
 head losses device which modify system curve}   P re s s ure



 •{Subsystem 2}={fan}+{motor}+{drive}+{ power supply                                                                          2

 frequency converter}                                           F a n p e rfo rm a n c e c u rve
                                                                       a t fu ll s p e e d
                                                                                                                  B           1

 •{Subsystem 3}= {fan}+{motor}+{drive}+{power supply            F a n p e rfo rm a n c e c u rve
                                                                                                                          A

 voltage converter}                                                 a t re d u c e d s p e e d               D

                                                                                                                      C

 •{Subsystem 4}= {fan}+{motor}+{drive}+{mechanical
 device which change fan curve}
                                                                                                   Flo w r a te




  7
An example in the “air distribution” family

          P3.1 Reduce motor power (according to fan
                power demand) when oversized

       2) Considered actions

• Action 1 replacement of motor @ same torque and speed as existing
• Action 2 to change the mean of flow rate adjustement

       3) Technical data to request to owner/manager or to find directly
       (manufacturer data)

Fan performance curve as a function of flow rate and pressure
       4) Technical observations to be made on site
   Motor nameplate data


   8
An example in the “air distribution” family

       P3.1 Reduce motor power (according to fan
             power demand) when oversized
     5) Common monitoring of existing situations

     • Initial flow rate
     • Motor monitoring: RMS current mean of 3 phases,
     RMS voltage mean of 3 phases and power factor.
     • Output/input frequency(subsystem2) /
     voltage(subsystem 3) of power supply converter




 9
An example in the “air distribution” family

 6) Criterion for ECO applicability
     Motor load vs motor efficiency
                   100,00

                    90,00

                    80,00

                    70,00

                    60,00
      Efficiency




                    50,00                                                              11,2 kW

                    40,00

                    30,00

                    20,00

                    10,00

                     0,00
                            0%   20%   40%      60%        80%       100%       120%
                                             Load factor



                                               PN nameplate power
 load  / N
      P
   factor
       m P                                     Pm measured input three phase power

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An example in the “air distribution” family

     6) Criterion for ECO applicability

             subsystem                 Criteria                          action
                                   load factor<70%                         1
                     1
                                 70%<load factor<95%                       2
                     2             load factor<30%                         1
                     3             load factor<40%                         1
                     4             load factor<30%                         1
• Action 1 replacement of motor @ same torque and speed as existing
• Action 2 to change the mean of flow rate adjustement
•{Subsystem 1}= {fan}+{motor}+{drive}+{mechanical head losses device which modify system
curve}

•{Subsystem 2}={fan}+{motor}+{drive}+{ power supply frequency converter}

•{Subsystem 3}= {fan}+{motor}+{drive}+{power supply voltage converter}

•{Subsystem 4}= {fan}+{motor}+{drive}+{mechanical device which change fan curve}

   11
An example in the “air distribution” family


 7) Recommendation for realisation of ECO
• Guideline to select a new motor
• Balance adjusters must be adapted to have the initial
flow rate.


 8) Additional support
  • Equations to select a new motor
  • References to litterature and case studies



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     Deliverable of Work Package 5

 A minimum of 50 detailed ECO forms among 137
 • Frequency of detection on field
 • Time of recognition for inspection use  link with
   inspection items
 • Saving evalutions:
       – Case studies measurements
       – Case studies simulation or typical buildings/systems
       – Litterature




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Thank you for your attention
Questions?




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