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Type: Posts; User: moideen

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  1. Replies
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    the first sign is low suction pressure and...

    the first sign is low suction pressure and subsequent ice forming...
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    this is commercial building

    this is commercial building
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    I align with you that the we should accept the...

    I align with you that the we should accept the advanced methods when selecting a product. Here, the plug fan is variable, direct drive and efficient compare to DIW fan. However, I believe the fan not...
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    When I checking the ahu submittal, I can’t see...

    When I checking the ahu submittal, I can’t see more info about fan, but, the submittal claim that the ahu does align eurovent specs. Vendor list included the major manufacture like carrier , York,...
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    see the impeller construction. impeller of plug...

    see the impeller construction. impeller of plug fan is 20% of glass fibre , it is not robust design compare to galvanised steel metal impeller of DDIW fan
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    ddiw fan

    ddiw fan
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    420

    plug fan extracted from cat.

    plug fan extracted from cat.
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    420

    FAHU i mean here ,100% fresh air handling unit....

    FAHU i mean here ,100% fresh air handling unit. yes, the fan is variable speed
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    PLUG fan for FAHU

    i found a FAHU submittal for new project, brand name is VTS CLIMA. the fan is selected with PLUG FAN. i didn't see before plug fan used for FAHU, I have seen mainly belt driven. is there any concern...
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    twin heat recovery wheel for FAHU

    does anyone have experience with twin wheel energy recovery wheel performance for purchasing new fresh air unit? i have a new requirement for se;ecting fresh air unit, tow options given by...
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    chilled water plant room guidelines

    hi, anybody has the standared guidelines of chilled water plant room arrangement. my request comes in the lights of my recent visit to new chilled water plant room where no proper way to reach the...
  12. maybe the undersized equalizer line caused the...

    maybe the undersized equalizer line caused the overflowing. equalize line to be sized 15% more capacity of single tower flow rate. please check and update
  13. Replies
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    My experience not in fan motor, but premature...

    My experience not in fan motor, but premature failure of the condenser coil. rataf's condenser leaked within two year
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    774

    grundfos distribution pumping system

    Grundfos has a chilled water pumping system where they have a distribution pumping by replacing the large secondary pumps and introducing a holistic solution to the low delta T syndrome, removing the...
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    it gives more lights. as for FAHU, FCU..the...

    it gives more lights. as for FAHU, FCU..the filter rack is an integral part.
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    see a graphical representation of live readings...

    see a graphical representation of live readings of FAHU, look at the external static before filter and after fan, the esp is 376+205=581pa(2.3 wg).in a point of fact , i have so far not get the...
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    external static pressure in the name plate

    My understanding about external static pressure which manufacture printed on unit's name plate, is the sum between the after the filter and after the fan. So, it only exclude the drop of coil , heat...
  18. Replies
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    2,872

    I am part of property management, looking at the...

    I am part of property management, looking at the maintenance of facilities. our HVAC system includes centrifugal chiller water to rooftop packaged units. thanks
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    I sat with him finally, he was then cool and nice...

    I sat with him finally, he was then cool and nice guy. I put the p-h chart on the table. He explained and his argument was the difference between (delta T) the saturated vapor curve towards to...
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    i dont want to give up.:grin2: planning to sit...

    i dont want to give up.:grin2: planning to sit with him with a cool mind and mollier chart. i will see his explanation
  21. Replies
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    2,872

    pay difference is a fact. in which year you were...

    pay difference is a fact. in which year you were in dubai?
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    2,872

    he syas the delta T will be zero always!!he has...

    he syas the delta T will be zero always!!he has to clarif but he is not ready to explain..... delta always is 0(zero) do you agree????
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    I think he wants to celebrate his entry in the...

    I think he wants to celebrate his entry in the presence of HR with some showoff like insulting others with unsuitable terminology:argue:
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    2,872

    your link doesnt work. ok, desuperheat region,...

    your link doesnt work. ok, desuperheat region, satuaration and finally subcooling. what does he mean delat T?!:bump:
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    I don’t think, because he was screaming...

    I don’t think, because he was screaming indignantly at me by claiming that delta is zero. How??? I felt it was a stupid question, then he shouted me by saying like’’ you people don’t know...
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    DELTA T IN THE REFRIGERATION CYCLE

    A newly appointed head of maintenance manager tested my knowledge by asking a question in refrigeration cycle that, what is the delta T between the compressor discharge point to inlet of expansion...
  27. Thread: Chiller

    by moideen
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    1,125

    sub cooling will be varied based on position of...

    sub cooling will be varied based on position of exv,condenser fans in running etc. better off check the chiller manual where the method of charging clearly explains. if there is any lack of...
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    yes that is also to be considered. but we dont...

    yes that is also to be considered. but we dont know the condition of the air when the spreading is rampant..
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    yes, it is critical. this is reason ,in idaia,...

    yes, it is critical. this is reason ,in idaia, there is instruction from govt to shut down AC in malls. CAN YOU COPY PAST THE CONTENT FROM AL JAZEERA, because it cannot open here in UAE. FAHU will be...
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    that is related to the ac cleaning or ac working....

    that is related to the ac cleaning or ac working. but FAHU operation is different. take outside air and distribute to every location of the building....
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    FAHU and COVID-19

    Do you think that the FAHU has any role to spread the covid 19. the virus lives in air , so there is chance to spread the covid through the fresh air distribution. what you think...
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    you can control the RH by reheating the treated...

    you can control the RH by reheating the treated air
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    Mitsubishi centrifugal recommends

    Mitsubishi centrifugal recommends
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    diagram shows star and delta. at present, how the...

    diagram shows star and delta. at present, how the motor connected with the terminal ,direct star or direct delta??? or star delta combination?
  35. Today an authorized trane’s service person came...

    Today an authorized trane’s service person came to my office and introduced a new product for the screw chiller. A vfd package for trane RTAC screw chiller. RTAC already has slide valve mechanism. I...
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    thanks be to your good heart

    thanks be to your good heart
  37. Replies
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    I align with you, after the psychometric...

    I align with you, after the psychometric analysis, i thing there is not much benefit from heat pipe. really welcome if any different comments and more lights to the subjects
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    I put the manufacture’s documented typical design...

    I put the manufacture’s documented typical design value in psychrometric then I found only a very little arounf 0.91lb(w)/lb moisture content (absolute humidity) removed by the pre cool coil. but the...
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    This is a combination of pre cool and reheat...

    This is a combination of pre cool and reheat process by which change the saturated condition of air off temperature. RH will only be varied by this arrangement.
  40. screw chiller slide valve will varies the load...

    screw chiller slide valve will varies the load until 10% capacity. then where is the significant saving when using the vfd compressor
  41. we have number of york vsd(YCIV) chillers. after...

    we have number of york vsd(YCIV) chillers. after the 10 year operation, almost all compressors were overhauled. so there is a fact that the high RPM may shorten the life. i don't feel these chillers...
  42. Replies
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    HEATPIPS in FAHU

    The FAHU that is around above 200-ton capacity with 4 number consist heat recovery and heat pipe. We face a problem that ahu room where no space to remove the giant heat pipe to service and the 6-row...
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    any chance for the fight khabib vs Masvidal

    any chance for the fight khabib vs Masvidal
  44. Replies
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    What I understand that the local manufactures...

    What I understand that the local manufactures have no any engineering ideas to design a coil. I asked them, what is the internal volume of condenser coil, total heat rejection...etc. they don’t have...
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    3,586

    there is a possibility when fan blade place in...

    there is a possibility when fan blade place in the wrongway,it means if thereis no desighn air flow definity reduce the condensation and subcooling. but, in my case, it is correct placing.
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    yes, i am also working in the same way . first...

    yes, i am also working in the same way . first goal is achieve the sub cooling; at the same time, when charging to get the subcooling, the condenser pressure do not raise above max.discharge...
  47. Replies
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    3,586

    vacuum 500 micron, so there is no chance for non...

    vacuum 500 micron, so there is no chance for non condensible
  48. Replies
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    3,586

    i checked it by TESTO 550. I got only 2F.

    i checked it by TESTO 550. I got only 2F.
  49. Replies
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    3,586

    yes, the indicator of the solid column is...

    yes, the indicator of the solid column is achieving 5 to 8k(9 to 14F) subcooling
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    no, the filter drier is proper.

    no, the filter drier is proper.
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