FOCS 1502 8404 200909 GB - Prime .III FOCS_1502_8404_200909_GB FOCS HFC R134a Increasingly closer

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  • III FOCS_1502_8404_200909_GB

    FOCS

    HFC R134a

    Increasingly closer attention is being paid towards the power

    consumption of air-conditioning equipment. Indices have been

    introduced that also consider usage in part load conditions

    when the external air temperature is lower than the rated value

    and when the separation stages of the cooling compressors

    are used.

    The valuation index adopted in the United States is called

    IPLV

    (Integrated Part Load Value) and is de! ned in the regulations

    issued by ARI (American Refrigeration Institute).

    ARI Standard

    (1) IPLV ARI

    = (1*EER100%

    + 42*EER75%

    + 45*EER50%

    + 12*EER25%

    )

    /100

    where EER100%, EER75%, EER50%, and EER25% are the ef-

    ! ciencies of the chiller in the various load conditions (100% -

    75% - 50% and 25% respectively), calculated in the operating

    conditions shown below. The temperature of the water leaving

    the evaporator is considered constant at 6.7C in all load condi-

    tions, with a delta of 5C in the full load condition.

    The multipliers 1, 42, 45 and 12 are the cooling performance

    coef! cients in various load conditions statistically calculated

    by ARI on the basis of surveys conducted, for various types of

    buildings and operating conditions, in 29 Amerian cities.

    Evaporator temp. leaving 6,7 C constant

    DeltaT full load 5C

    Load 100% 75% 50% 25%

    Cond. inlet water temp. 35C 26,7C 18,3C 12,8C

    In normal European applications it is dif! cult to think of a chiller

    working at an external air temperature lower than 20C. Air-

    conditioning is never used to this extent; design and legislative

    constraints tend to reduce power consumption and encourage

    the adoption of systems based on the direct or indirect use of

    external air wherever possible (FreeCooling).

    In Europe there is an EECCAC (Energy Ef! ciency and Certi! ca-

    tion of Central Air Conditioner) proposal

    Proposal EECCAC

    (2) ESEER = (3*EER100%

    + 33*EER75%

    + 41*EER50%

    + 23*EER25%

    )

    /100

    where

    Evaporator temp. leaving 7 C constant

    DeltaT full load 5 C

    Load 100% 75% 50% 25%

    Cond. inlet water temp. 35C 30C 25C 20C

    1.2 Using the energy indices

    After estimating the total cooling capacity required by the system

    in the summer mode (in kWh), we can calculate seasonal elec-

    tricity consumption (in kWh) using the following formula:

    Power absorbed = Power requested / Index of ef! ciency

    This method allows us to make comparisons between similar or

    equivalent systems using the same reference unit.

    1.1 Energy indices ESEER and IPLV

    1. ENERGY INDICES

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  • 2 FOCS_1502_8404_200909_GB

    FOCS

    HFC R134a

    Electric power and control panel

    Electric power and control panel, built to EN 60204-1/EC 204-1

    standards, complete with:

    - control circuit transformer,

    - general door lock isolator,

    - power circuit with bar distribution system,

    - fuses and contactors for compressors and fans,

    - terminals for cumulative alarm block (BCA),

    - remote ON/OFF terminals,

    - spring-type control circuit terminal board,

    - electric panel for outdoor installation,

    - electronic controller.

    - phase sequence relay

    Basic model

    Unit without heat recovery.

    Model with partial heat recovery (D)

    Air cooled chiller with partial heat recovery. Compared with the

    basic con! guration, this version features an additional refriger-

    ant/water heat exchanger on the gas delivery line. This heat

    exchanger, ! tted in series before the traditional cooling circuit

    condenser, is large enough to recover heat for the production of

    medium-to-high temperature water for domestic hot water and

    the like. The heating capacity of the heat recovery circuit is ap-

    proximately equal to the power input of the compressor. Each

    exchanger is ! tted standard with an antifreeze heater

    Model with heat recovery (R)

    Air cooled chiller with total heat recovery. Compared with the

    basic con! guration, this version features an additional refriger-

    ant/water heat exchanger on the gas delivery line. This heat

    exchanger, ! tted in parallel with the traditional cooling circuit

    condenser, is large enough to recover heat for the production

    of domestic hot water and the like. The heating capacity of the

    heat recovery circuit is approximately equal to the cooling pow-

    er plus the power input of the compressors. Each exchanger is

    ! tted standard with an antifreeze heater

    AVAILABLE VERSIONSB (Base)

    Standard unit.

    Standard unit. Unit with Low Temperature Pressure Device for

    condensation control

    LN (Low Noise)

    Low noise version. This con! guration features special sound-

    proo! ng for the compressor chamber and reduced fan speed.

    Unit with Low Temperature Variable Speed Device for conden-

    sation control

    SL (Super Low Noise)

    Super low noise version. This con! guration features special

    soundproo! ng for the compressor chamber, reduced fan speed,

    an oversized condensing section. Unit with Low Temperature

    Variable Speed Device for condensation control.

    2.3 W3000SE Large electronic controller

    The controller W3000SE Large offers the latest control and

    functions developed directly by Climaveneta on the basis of

    their experience gained over the years with the particular units

    and services