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استعمال فريون 22 بدلا R 407 C

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  1. [21]
    الصانع
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    Technical Literature

    السلام عليكم و رحمة الله و بركاتـه ،،

    اتمنى ان تستفيدوا من الروابط التاليــة :ـ

    General



    Safety and Handling



    Technical/Properties/Engineering




    Product Information
    ASHRAE #

    R-407C


    Replaces

    R-22


    Applications

    • Positive displacement equipment:
      • new or existing residential and commercial air-conditioners
      • new or existing residential and commercial heat pumps
    • Existing medium-temperature applications.

    Benefits

    Similar to R-22 in capacity and energy efficiency.


    Phaseout Schedule

    Consult the specific regulations in your country or region.


    Lubricant Recommendation

    POE


    ASHRAE Safety Classification

    A1


    Cylinder Sizes

    See specific container size information in your country or region.


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  2. [22]
    أبوجميعان
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  3. [23]
    swairjo
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    ارجو قرأء المرفق مفيد جدا

    Results of a Field Test Using R-407C in Split System Heat


    Pumps

    Alan Boyd Principal Engineer

    ABSTRACT

    This paper discusses the results ofa Jield
    test to determine implications ofan R-407C
    replacement of R-22.

    A change ofrepigerants precipitates other
    changes in materials, component selection, and
    processing. In addition, thermodynamic properties
    are diflerent. Consequently, the eflects on
    durability, thermal per-once, humidity control,
    servicing, and manufacturability were questioned.

    The jield test addressed many of these
    questions. Anticipated changes in manufacturing
    processes were implemented on the production line.
    Contractors were educated on the diflerences in the
    refrigerant. Data were obtained by repigerant,
    lubricant, and component tear down analysis.
    Experiential information was derivedpom feed back
    of contractors and home owners, as well as multiple
    site visits.

    Generally, the$eld test has demonstrated
    that by following afew basic rules, the industry can
    anticipate use ofR-407C with satisfactory results.
    However, the surprising appearance ofa
    contaminate precipitant indicates the needfir more
    investigation into long term eflects.

    INTRODUCTION

    Unitary HVAC equipment has relied on the
    HCFCR-22 for many years. With phase out
    eminent, the HVAC industry seeksviable alternative
    refrigerants. Of those being considered, R407C has
    risen to the forefront as a potential drop-in
    replacement for R-22.

    While laboratory tests with this blend have
    been canied out by various organizations, field
    testing has been limited. A need to gainexperience
    with manufacturing, installation, servicing, and field

    Lennox Industries, Inc. Carrollton, TX

    operation was recognized and resulted in a joint

    effort by Lennox Industries, Inc., Copeland Corp.,

    and Du Pont Fluoroproducts. In 1993 a field test

    was initiated to gain some experience with R-407C

    and POE lubricants. This paper reviews that testing

    and the results.

    FIELD TEST DESCRIPTION

    The mainobjectives of the field test were
    the following: 1) validate R407C refrigerant and
    POE lubricant processing procedures for both the
    factory and the field, 2) monitor the installed units to
    assess compatibility of the refrigerant and lubricant
    with the system, 3) obtain input from the field on
    issues or problems associated with installation,
    servicing, operation, sound levels, etc., 4) return and
    analyze components after su£ficient test time to
    determine any long term effects of the refrigerant or
    lubricant.

    R-407C closely matches system
    performance ofR-22. It has zero ozone potential,
    low global warming potential, and is non-flammable.
    It operates at a slightly higher pressure, is zeotropic
    (different composition ratios in liquid and vapor
    phases), and has the evaporating and condensing
    "&den characteristic. The original composition of
    this ternary blend consisted of 30% R-32,10% R-
    125, and 60% R-134a by weight. During the course
    of the field test this refrigerant was replaced with Du
    Pont's current blend ratio.

    The compressor used for the field testing
    was a scroll manufactured for usewith R-407C
    refrigerant. Due to the immiscibility of HFC's and
    mineral oil, Copeland selected the Mobil EAL Arctic
    22 lubricant which is a polyol ester (POE) oil. Also,
    each compressor had a special oil drain fitting
    installed on the side of the canin a position which
    allowed limited oil withdrawal.

    Lennox manufactured 3 ton split heat pump
    systems for the field test. These were supplied with


    Alco Glter-driers specified for use with this HFCand
    the POE oil. Also, Alco thennal expansion valves
    (TXV's), with a setting based on laboratory testing
    of R-dOX, were provided. A new indoor coil and
    new line sets were installed with each heat pump.

    POE oil has an fity for moisture and
    will begin to break down if too much moisture is
    abso-. This was a concern during manufacture,
    installation, and servicing of the systems.
    Compressors were not opened to the atmosphere
    until justbefore brazing into the system.

    Another area of concern centered around
    the charging techniques with this ternary refrigerant
    blend. Since it is a zeotrope, the composition varies
    between the liquid and vapor phases. In order to
    maintain the proper composition, the units had to be
    liquid charged in the factory and in the field (if
    necessary). Also, the "&den characteristic required
    determining superheat from the "Dew Point" and
    subcooling hm the "Bubble Point" of the
    refrigerant. This required some education of the
    dealers.

    The field test consisted of ten systems
    installed at residential sites. Eight were installed in
    the Dallas, Texas area, one in Phoenix, Arizona, and
    one in Fargo, North Dakota. Data collection
    included oil and refrigerant samples, and
    observations and feedback from the partxipants
    (homeowners) as well as the dealer. The units were
    retunred to standard R-22 configuration at the end of
    the field test, and compressors, driers, expansion
    valves, and line sets from the test were analyzed for
    long term effects.

    TEST RESULTS


    The systems were installed in the spring of
    1993 by approved dealers. All of the installations
    went well.

    Oil samples were taken approximately 24
    hours after each system was installed. Most of these
    showed moisture levels higher than the
    recommended 50 PPM; thus, the need for stringent
    processes (and very good drier action) with this
    lubricant were made apparent. Other than thaf the
    samples indicated no problems.

    Based on comments from the participants,
    the systems provided the cooling and heating
    performance required. No problems occurred that

    were associated with the alternate refrigerant and
    lubricant.

    As the field test progressed, DuPont had
    reformulated the refrigerant blend for ~~~~~9000:
    23% R-32,25% R-125,52% R-134a by weight.
    Also, Copeland had a reformulated lubricant with
    improved wear characteristics. Because of these
    developments, the compressors, oil, and refrigerant
    were replaced in November of 1993. No driers were
    changed. Although this is not good service practice,
    we wanted to push the test closer to the edge in the
    area of moisture.

    After the units had been running 24 hours,
    an oil sample was taken. Moisture levels were
    better, although a few were still higher than the
    desired 50 PPM. This sample established a baseline
    for comparison.

    All units operated well through the winter
    months (%eating mode), and no performance
    problems were reported.

    Oilsamples were taken again in April of
    1994. Analysis of these second samples looked very
    promising; the moisture levels were reduced from
    the initial oil samples (samples taken after
    compressor change out). The moisture *******
    measured in the two analyses are compared in Figure
    1 for the Dallas area sites. The lower levels showed
    that the filter drier wasperforming as it should.

    12345678
    (3allas Field Test Stes

    Nov. 93Sanple .Ap. 94 Sample

    FIgure 1 Oil Sample Analysis -kistute

    The total acid number wasalso measuredfrom the
    samples and the results are shown in Figure 2.
    These levels also looked good. This is a further sign
    that moisture levels are being controlled and no
    significant oil breakdown is occurring.


    12345678
    Dallas Field Test Sites

    Flgure 2 Oil Sample Analysis- Acid

    The metals ******* for both sets of samples
    was very low and thus indicated no signs of
    premature compressor wear.

    Refrigerant samples were also taken in
    April of 1994. Some of the refrigerant samples
    revealed very unexpected compositions; we suspected
    the sampling technique was to blame. A subcooled
    liquid refiigerant sample mustbe obtained into a
    container which closely matches the required sample
    volume to insure accurate composition results. A
    second, careful sampling from the field sites in
    question produced favorable results. The
    composition of each constituent generally measured
    +I- 2% from the original blend composition. These
    slight changes in composition were attributed to
    error inherent in the sampling and measurement of
    the refrigerant. Basedon the measurements, no
    significant composition changes had occurred in the
    systems.

    Operation throughout 1994 and 1995
    continued to be very successful. The participants
    remained satisfied with the performance of the
    systems. However, there were occasional reports of
    mild weather high pressure switch trips.

    There was an attempt to take another oil
    sample in early 1995 for comparative analysis. Due
    to the oil level being below the oil sampling port on
    some compressors, we were able to get oil from only
    half of the compressors. Ofthe samples which we
    were able to get, the volume of oil was insufficient to
    measure the acid and moisture ******* was not
    significantly different from earlier measurements.

    In mid 1995, the lintof the field test units
    was converted back to R-22 wl mineral oil. It was at
    this time that we noticed the presence of an unusual
    contaminate. By the end of 1995, all except three
    sites were converted back to R-22. These threesites

    willremain operating on R407C for the foreseeable
    future.

    The sourceand implications of the
    contaminate are still under investigation. It seems to
    be associated with high discharge temperatures. A
    thorough understanding of this phenomena is a
    prerequisite for confidence in a product's long term
    performance and reliability.

    CONCLUSION

    Without exception, the participants were
    very satisfied with the thermal performance of the
    systems.

    Several points of interest are worth noting

    from the field test:
    Moisture levels are a concern with the
    POE oil but appear to be controllable
    with the proper Glter-drier and
    manufacturing, installation, and service
    practices.

    Service personnel seemed to adapt easily
    to the "glide" characteristics.

    Care must be taken when extracting
    refrigerant samples for analysis.
    Internal volume of the sample containers
    should be close to the required volume of
    the sample and samples must be
    subcooled Liquid.

    There were reports of high pressure
    switch trips. Threeof those reporting
    sites were tracedbackto poor air
    volumes across the indoor coil. One
    other site remains mysterious and
    possible causes are still being
    investigated. It should be noted that t
    pressure switch was set for R-22
    operation and R407C operates ata
    slightly (approx. 20 -30 PSI)higher
    pressure than R-22.

    Deposition of a mysterious contamina
    inside the system is still under
    investigation.


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  4. [24]
    swairjo
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    كيفية استخدام r22 & r407

    الله يوفق الجميع و أرجوا من شخص قام فعليا باستخدام الغاز 22 في ماكنة تكييف 407 اخباري عن النتائج واي تعديلات يجب عملها خصوصا في ماكنة سبلت يونت

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  5. [25]
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    اخى العزيز 407 يحل محل 22 وايضا يمكنك ان تضع بدل 410 غاز 22 للمكيفات دون تغيير الزيت واخى عليك ان تراعى الكتالوجات ومن الافضل ان تعمل حسب ما هو مكتوب على الضاغط لكى تتجنب اى مشكلة نحن بغزة بسبب الحصار مثلا قمت بتركيب بدل 410 غاز 22 وممتاز جدا دون اى تغيير للزيت

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  6. [26]
    كندي يونس
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    اقتباس المشاركة الأصلية كتبت بواسطة bobstream مشاهدة المشاركة
    لديتندور= صمام التمدد
    الديتندور هو cabeleri

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  7. [27]
    كندي يونس
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    اقتباس المشاركة الأصلية كتبت بواسطة النينجا مشاهدة المشاركة
    غاز 407c مكون من ثلاث غازات R32,R125, R134a ويستخدم معه زيت Synthetic بينما R22 يستخدم معه زيت Mineral و في الأنواع الجديدة من الكمبرسرات (Copeland) ممكن استخدام زيت يصلح للاثنين معا و بالتالي لا داعي لتغيير الزيت إن كان الزيت من هذا النوع. والله أعلم
    هل مكن اغير كمروسر يشتغل 404 بكمبروسر يشتغل 134a واش هي عيارات الضغط التي يجب ان اضبطها على الكمبروسر مع ان العمليه على مبردة عصيرات
    كما اريد كم ضغط السحب بالبار
    وشكرا

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  8. [28]
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    جميييييييييييل

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  9. [29]
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    اخي الكريم لامانع من استخدام فريون 407 بدل من 22 وبالعكس مع مراعاة نوعية الزيت في الضاغط

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  10. [30]
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    شركة ايه جى كيم لتعبئة غازات الفريون تدعوكم لزيارة مصنعنا فى مدينة بدر لآختبار الفريون

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