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Type: Posts; User: mohad_i

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  1. Thread: online HVAC

    by mohad_i
    Replies
    9
    Views
    1,633

    online HVAC

    hi

    with today online activity became more common. in all fields and aspect almost. what could be related to our HVAC industry?

    what services an HVAC technician can provide online?
    what...
  2. Replies
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    758

    R410 phase down and R454B alternative

    for the new alternative refrigerant. some asked me wither their will be a capacity lose with the new refrigerant?

    its not easy simple answer like what used to be in the past alternatives scenarios...
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    4,596

    Honeywell on-demand free webinar

    recommend it for all beginners and juniors in refrigeration and air conditioning

    can be found all in bellow e-learning link

    https://hvacr.elearn.network/
  4. Replies
    10
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    2,879

    interesting idea to study.. thanks

    interesting idea to study.. thanks
  5. Replies
    10
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    2,879

    open drive rotary compressor

    i have an idea for water dispensers

    but looking for open drive rotary compressor small size.

    any suggestions where can i find such compressor?
  6. Replies
    8
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    1,579

    i am a mfg screw with vfd, i have done it once....

    i am a mfg
    screw with vfd, i have done it once. the cost of chiller like 15% more. for no big reason.

    the sliding valve will save energy if compressor start unloading and work in partial...
  7. Replies
    8
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    1,579

    chiller efficiency

    which design would be more helpful for energy saving in chiller operation?

    a chiller with screw compressor using sliding valve to modulate the flow rate according to real load, (unloading the...
  8. Replies
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    12,187

    dont forget to check the electrical components if...

    dont forget to check the electrical components if still fit or need to oversize also.
    the oversized compressor will consume more power and ampere.. make sure the installed...
  9. Replies
    32
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    12,187

    How much oversized? It can be fine, but you...

    How much oversized?

    It can be fine, but you need to observe the system reading and some extra refrigerant is needed.

    Power consumption will be increased, also delivered capacity will increase....
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    669

    Certifications and license

    Hi

    To help the new comers to HVAC business, I think they we can help them by introducing them to market required certifications and license.

    Professional folks; your feedbacks. If license...
  11. Thread: Hvac tech

    by mohad_i
    Replies
    3
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    1,703

    What exactly the issues you have so we can help?

    What exactly the issues you have so we can help?
  12. Replies
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    2,859

    hermetic compressors usually coming with oil...

    hermetic compressors usually coming with oil sight glass. (very small capacity for few and fractional horse power dont).
    for small sized compressor no worries about the oil immigrating in the...
  13. Replies
    13
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    2,161

    plug fan can be for high static application if...

    plug fan can be for high static application if constructed with heavy thick steel. . i saw it with twin city plug fan.
    and other plug fan are made of plastic used for low and medium static...
  14. Replies
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    4,986

    yah, thanks... there was my mistake. i didn't...

    yah, thanks... there was my mistake.
    i didn't notice he is using this method for resistive load only (electric resistive heater).

    thanks
  15. Replies
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    4,986

    finding out CFM of a unit

    hi.
    i have seen a YouTube video about how to find out the actual CFM of a unit installed and running. at the beginning it was showing nice a great calculation formulas. but then i get confused when...
  16. Replies
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    2,051

    Refrigerant Retrofitting

    Hi everyone.

    retrofitting from refrigerant to another is very demanding in the last few years. but questions arises from users and maintenance guy's about capacity loose and the new working...
  17. Replies
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    1,104

    i thought lowering CFM will only change on the...

    i thought lowering CFM will only change on the off-coil temperature and will be more close to the coil ADP temperature.(and the evaporator temp will remain unchanged).

    but now it turn out that my...
  18. Replies
    8
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    1,104

    total capacity related to CFM air flow rate

    a question:
    considering we have a two HVAC units (same model) working on the same conditions (the same ambient temperature/same on-coil temperature).

    with only one difference, the CFM not same...
  19. low suction temperature/high discharge temperature

    hey all.

    first excuse my language (not native English speaker).

    i an learning about the HVAC and i am now understanding the principles behind "suction temperature" and "discharge temperature"...
  20. evaporator coil physical dimensions and cooling

    Hi

    usually when we talk about the indoor unit (AHU or FCU), it have two main components, the evaporator coil and the supply fan.

    what the effect on off-coil temperature (dry-bulb , humidity...
  21. Replies
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    24,138

    HVAC instant chat message application.

    dears
    just wondering if there is any instant chanting application like the old yahoo messenger app. it was a greet and useful application.

    thanks
  22. Replies
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    2,735

    dears hope your help in understanding the...

    dears

    hope your help in understanding the difference between the ideal and real cooling curve on psychrometric chart.

    what the reason behind their difference?
    why the dehumidification start...
  23. Replies
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    16,730

    thanks knave this is something new for me....

    thanks knave

    this is something new for me. thanks for the info. this is called the evaporator approach, right?

    why 35F lower than the return air temp?
    what will happen if higher or lower...
  24. Replies
    17
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    19,776

    thanks in the refrigerant to air approach...

    thanks

    in the refrigerant to air approach temperature, it should be the off-coil air temperature.. right?

    and the same concept applies here, the closer saturated refrigerant temperature to air...
  25. Thread: evaporator td

    by mohad_i
    Replies
    12
    Views
    13,347

    dears, i am new in HVAC and trying to practice...

    dears, i am new in HVAC and trying to practice it.

    am reading about condenser and evaporator temperature approach.

    is it only terms used for chillers? or for rooftop package units also?
    how to...
  26. Replies
    17
    Views
    19,776

    i am new in the field and practicing the HVAC...

    i am new in the field and practicing the HVAC system.

    the evaporator approach temperature, is it only a term used for Chillers?

    in case of package roof top units, can we say evaporator approach...
  27. Replies
    19
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    16,730

    thanks to all i am practicing the HVAC and...

    thanks to all

    i am practicing the HVAC and trying to master it.

    can you advise me for some topics to read it about the dry/wet coils?

    also the evaporator coil, is it related to indoor load...
  28. Replies
    19
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    16,730

    dears wet/dry coils.. is this also something...

    dears

    wet/dry coils.. is this also something related to over/under sizing the evaporator coil?

    what impact of having bigger or smaller coil for the same compressor and condenser size outdoor...
  29. some real life example, find bellow: ambient:...

    some real life example, find bellow:

    ambient: 125F
    supply fan air flow rate: 9575 CFM
    Entering dry bulb temperature: 80.20F
    entering wet bulb temperature: 63.70F
    ent. enthalpy: 28.91 Btu/lb...
  30. thanks my friend sure my formula in first...

    thanks my friend

    sure my formula in first method only about sensible heat cooling capacity . while the formula in the second method for total cooling capacity.

    so by sense, the final result...
  31. cooling capacity calculation for the equipment.

    hi everybody,

    i am trying to practice the roof top unit (RTU) cooling output calculation (to master it). using two methods

    first method:
    - first i am finding the temperature change across the...
  32. Replies
    5
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    thanks you all for the perfect contribution you add,

    thanks you all for your perfect contribution you add, its all of greet help to me.

    what i had in mind for condensing temperature is how much higher should i keep it from the ambient temperature...
  33. Replies
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    3,007

    refrigerant critical temperature

    hi friends.

    i am studying the HVAC system and trying to completely visualize the working condition for refrigerant throw out all process

    in the condenser coil the gas will condense at the...
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