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Overall chiller system energy efficiency. Sénéjean B , Merchat M, Faurel C, Thibault S, Doucouré A, Benassis F . Introduction. A growing demand for air-conditioning EE stakes in chilled water production: Controlling the energy consumed by existing systems

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Overall chiller system energy efficiency

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Overall chiller system energy efficiency l.jpg

Overall chiller system energy efficiency

Sénéjean B, Merchat M, Faurel C, Thibault S, Doucouré A, Benassis F


Introduction l.jpg

Introduction

>

  • A growing demand for air-conditioning

  • EE stakes in chilled water production:

    • Controlling the energy consumed by existing systems

    • Developing ever more energy efficient systems

  • Accordingly, the need to know the true performance of chiller systems

How do we assess the energy efficiency of chilled water

Installations?


Indicators l.jpg

Indicators

3

>

Nominal COP and EER :energy efficiency indicators established by the main

installation manufacturer for nominal working conditions

ESEER and SEER : energy efficiency indicators taking part- loading

operations into consideration

COP and EER quantified : energy efficiency indicators established as part of this

study taking into account the true performances of the

installation and its accessories

N.B. The only difference between EER and COP is the units used

EER: btu.hr-1.W-1 COP/ESEER: Wf/We


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Measurement equipments :

  • 31 Temperature sensors

  • 12 Wattmeters


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Specifications for the units selected

5

The results provided only concern 4 of the 7 plants equipped with instruments


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Quantification methods

6

>

  • Measurements of all electricity consumptions for each appliance

  • Measurements of all heating power exchanged at the condensers and at the evaporators

  • Readings recorded at 10 minute intervals over the entire year

The overall energy statement is produced


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Scope of measurements carried out

7

Water condensers

Air condensers

Performance measurements for all equipment devoted to chilled water production – Does not include distribution


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Weekly results

8

>

Characterization of true chilled water production plant efficiency


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Control mode modification:

9

Example of a fault recorded during operations

Before

After

  • T° average cond. before January = 34°C

    • COP < 1

  • T° average conditions after January = 21°C

    • COP > 1

  • The operator has no measurement instruments = Plant operation is not optimised


    Slide10 l.jpg

    10

    Example of a fault recorded during operations

    The average loading rate per machine is kept at a very low level =

    Performances deteriorate


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    Results – Distribution of units consuming energy

    11

    49% of the electricity consumed by the plant investigated is consumed by the accessories


    Summary of results l.jpg

    Summary of results

    12

    >

    The results reveal major differences between measurements carried out and nominal performance levels


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    Conclusions

    13

    >

    • Few or no measurement instruments on most of the installations

    • True performance levels can only be assessed bycarrying out of measurements over sufficiently lengthy periods of time

    • The impact made by the operation cannot be assessed using tests of numerical simulation


    Outlook l.jpg

    Outlook

    14

    >

    • Measurements

    • Measures should be carried out on a wider sample of installations

    • Equipment

    • The need for specific meters for recording energy consumption and chiller energy produced by the installations

    • Assessments and comparisons

    • of the various technical solutions

    • of the retrofit impact on installations involving HCFC

    • of stand-alone installations and of centralised installations


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