nplv ,iplv chiller

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  1. [1]
    younis engineer
    younis engineer


    : May 2009
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    nplv ,iplv chiller

    nplv ,iplv chiller

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  2. [2]
    younis engineer
    younis engineer



    : May 2009
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    , efficiency NPLV IPLV

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  3. [3]
    The Jet
    The Jet



    : Dec 2006
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    Integrated Part Load
    Value
    Non-Integrated Part Load
    Value
    1998 a
    0.00025 0.0001.


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  4. [4]
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    : Nov 2007
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    Integrated Part Load
    Value
    Non-Integrated Part Load
    Value
    1998 a
    0.00025 0.0001.
    Non-Integrated Part Load Value
    Non-standard Part Load Value

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  5. [5]
    Eng.Mohd-Saleh
    Eng.Mohd-Saleh

      Eng.Mohd-Saleh


    : May 2009
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    IPLV : is an abbreviation for Integrated Part Load Value. Like the EER, the IPLV rating was developed by the Air-Conditioning and Refrigeration Institute. (In 1998, the ARI released a revised Standard, ARI 550/590-98 to cover IPLV.) Unlike the EER, however, the IPLV measures the efficiency of air conditioners under a variety of conditions -- that is, when the unit is operating at 25%, 50%, 75% and 100% of capacity and at different temperatures.
    IPLV is only calculated for non-residential central air conditioners -- if you are purchasing a central air conditioning unit for your home, you should compare efficiency based on the SEER rather than the IPLV
    .

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  6. [6]
    The Jet
    The Jet



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    non-integrated part load value
    Non-standard part load value


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  7. [7]
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    : Nov 2007
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    non standard nonintegrated


    Equipment Rating Standards
    The Air-Conditioning & Refrigeration Institute (ARI) establishes rating standards
    for packaged HVAC equipment. ARI also certifies and labels equipment through
    programs that involve random testing of a manufacturer
    s equipment to verify
    published performance. These equipment rating standards have been
    developed to aid engineers in comparing similar equipment from different
    manufacturers. Chiller full-load efficiency is described in terms of kW/ton and
    coefficient of performance (COP). Additionally, two efficiency values developed
    by ARI that are receiving increased attention are the
    Integrated Part-Load
    Value (IPLV)
    and Non-Standard Part-Load Value (NPLV).
    ARI
    s part-load efficiency rating system establishes a single number to estimate
    both the full- and part-load performance of a stand-alone chiller. As part of ARI
    Standard 550/590
    1998, Water-Chilling Packages Using the Vapor-Compression
    Refrigeration Cycle
    , and ARI Standard 5601992, Absorption Water Chilling-
    Heating Packages
    , chiller manufacturers may now certify their chiller part-load
    performance using the IPLV and NPLV methods. This gives the engineering
    community an easy and certified method to evaluate individual chillers.
    Understanding the scope and application limits of IPLV and NPLV is, however,
    crucial to their validity as system performance indicators.

    The IPLV predicts chiller efficiency at the ARI standard rating conditions, using
    weighted-average load curves that represent a broad range of geographic
    locations, building types, and operating-hour scenarios, both with and without
    an airside economizer. The NPLV uses the same methods to predict chiller
    efficiency at non-standard rating conditions. Although these weighted-average
    load curves place greater emphasis on the part-load operation of an average,
    single-chiller installation, they will not
    by definitionrepresent any
    particular installation.
    Additionally, ARI notes that more than 80 percent of all chillers are installed in
    multiple-chiller systems. Chillers in these systems exhibit different unloading
    characteristics than the IPLV weighted formula indicates. Appendix D of
    Standard 550/590
    1998 explains this further:
    The IPLV equations and procedure are intended to provide a singlenumber,
    part-load performance number for water-chilling products.
    The equation was derived to provide a representation of the average
    part-load efficiency for a single chiller only. However, it is best to use a
    comprehensive analysis that reflects the actual weather data, building
    load characteristics, operational hours, economizer capabilities, and
    energy drawn by auxiliaries, such as pumps and cooling towers, when
    calculating the chiller and system efficiency.

    Here is the important part:

    This becomes increasingly important with multiple-chiller systems
    because individual chillers operating within multiple-chiller systems
    are more heavily loaded than single chillers within single-chiller
    systems.


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  8. [8]
    younis engineer
    younis engineer



    : May 2009
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  9. [9]
    000403
    000403

      000403


    : Jul 2006
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  10. [10]
    Badran Mohammed
    Badran Mohammed



    : Apr 2006
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