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Type: Posts; User: Mohammed Nofal

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  1. thank you guys ... the mass of air will be...

    thank you guys ... the mass of air will be affected due to lower density , but how this will affect the package unit performance ? and why the cfm increased when the altitude increased ?
  2. influence of altitude on unit performance

    I need to know more about the influance of altituid on rooftop package unit performance , whay the performance goes down ? ,, if you have an article it will b
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    fins types

    i am asking about the performance of fins type

    are the lanced and louvered fins more efficient than corrugated fins ?

    which one has the higher air pressure drop with the same FPI

    if you...
  4. screw compressor vibration isolator

    i have two options for vibration isolator; spring isolator and rubber pads

    please advice about the best vibration isolator for screw compressor
  5. R290 pipe sizing chart and calculater

    hi all , i'm looking for R290 pipe sizing chart i have been searching fora long time but i didn't get anything
    please can you help me
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    in air handler, fan coil we use cooling coil (DX...

    in air handler, fan coil we use cooling coil (DX or chilled water) , my question is can we use groove tube instead of smooth tube for both DX and chilled water
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    Groove tube

    can the groove tubes use in the applications in which the fluid inside the tube chilled water ?!
    and what is the best shape of inner surface grooves?
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    yes i need alternative method of connection...

    yes i need alternative method of connection rather than Brazing
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    Refrigerant piping fittings

    Refrigerant piping in many application is connected by brazing and soldering ... i need to use coupling instead of it, is it applicable for HVAC applications or not ?!
    if yes anyone know some...
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    no, actually it's for my own information thank u

    no, actually it's for my own information
    thank u
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    Ethylene and propylene glycol in water

    As we know when we use a chiller to produce low water temperature we have to add glycol to avoid water freezing.... my question is at what temperature (inlet and outlet) we have to use Ethelyn or...
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    i know that but i'm from PETRA company in Jordan...

    i know that but i'm from PETRA company in Jordan and i want to get a compressor for testing purposes
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    R290 compressor Supplier

    I need a supplier for air conditioning compressor R290, please if anybody knows tell me

    thanks
  14. evaporative condenser VS air and condenser

    I want to ask about the condensing temperature of evaporative condenser VS air and condenser at 95 F and about also what about the approach temperature of each type
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    it's recommanded that the Condinsing temperature...

    it's recommanded that the Condinsing temperature = T (water out) + (4-9) F
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    R290 has a performance very close from R22 and...

    R290 has a performance very close from R22 and also no GWP and Ozone depletion but the problem it is flammable , i wanna to use it in my unit the question now, is there any risk of using it ? can the...
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    yes its highly flammable, but i ask about the...

    yes its highly flammable, but i ask about the piping design there is any difference !
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    thank you , but the paper does not talk about R290

    thank you , but the paper does not talk about R290
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    i did, but no good results

    i did, but no good results
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    R290 VS R22

    I want to know what is the advantages of using R290 instead of R22 ?!

    is there any difference in piping design , and what about the capacity ?!
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