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  1. Bobfd7dbf

    Plug fans vs belt driven centrifugal fans

    Hello all, I am not familiar with plug fans , Do plug fans have maintenence issues compared to the centrifugal fans ( belt driven fans ) I know that plug fans have less malfunctions , but in case of malfunctions happened (motor burnout , bearing wear , hub wear , etc ) is it easy to repair...
  2. Bobfd7dbf

    Sensible heat ratio and number of rows

    So as i know, higher SHR (closer to 1.0) = More change in temperature and less humidity removed and Lower SHR = less change in temperature and more humidity removed. I thought before that there is a relation between the number of rows and it's effectiveness for removing moisture ( as air have...
  3. Bobfd7dbf

    Sensible heat ratio and number of rows

    All parameters you have mentioned are taken in consideration. I kept everything constant and i just changed the return air temperature's humidity to a lower value in the comparison. I have found that as relative humidity of the on coil air decreases , sensible heat ratio increases and number of...
  4. Bobfd7dbf

    Sensible heat ratio and number of rows

    Hi all, I have recognized in AHU cooling coil selection that as the sensible heat ratio value increases the number of rows in a cooling coil increase. It does not make any sense for me , as i see higher sensible heat ratio means less latent heat value. So why the coil have more rows when SHR...
  5. Bobfd7dbf

    Constant volume chilled water system

    BronYrAur I know well that 3 way valve is good for maintaining constant flow in the system and why it is used with constant flow system over 2 way valve which is normally used with variable speed pumps. My question is not about this issue , i am asking if no control valve is added in constant...
  6. Bobfd7dbf

    Constant volume chilled water system

    Immsk Thank you sir i got it now
  7. Bobfd7dbf

    Constant volume chilled water system

    Immsk Thank you sir i got it now
  8. Bobfd7dbf

    Constant volume chilled water system

    Nuuvox000 You got me wrong sir , i am not saying i want to change the 3 way valves with 2 way valve. I am asking about just use balancing valves on coil to maintain the amount of water needed for each coil and not using any valve for part load control . Now please read my question again i am...
  9. Bobfd7dbf

    Constant volume chilled water system

    Pipe size becomes smaller either with 3 way valves or without . it's amount of water distributed to different coils and corresponding recommended pipe diameter for the amount of water needed for each coil. Can you explain your point clearly please? Who says it's essential ? I see in every...
  10. Bobfd7dbf

    Constant volume chilled water system

    Hello dears, In the constant volume chilled water system , why it's essential to add 3 way valve with bypass on each coil instead of coils without any valves except the balancing valve to ensure that every coil will take the flow needed ? I dont see any advantage of using this 3 way valves and...
  11. Bobfd7dbf

    Compressor crankcase

    But when the system is off, the pressure difference between the suction and discharge does not exist and pressures are equalized. If refrigerant is left in the evaporator when the system is off it migrates to the crankcase (lowest pressure part in the system) and causes problems. So why does...
  12. Bobfd7dbf

    Compressor crankcase

    Why does the crankcase of the compressor is the lowest pressure part in the refrigerant cycle ? So that refrigerant migrates to it when the system is off. Thanks in advance
  13. Bobfd7dbf

    Wet bulb temperature and water evaporation

    It's clear sir, But how does evaporation takes place without cooling the water ?? Evaporation of water will make the particles with the highest energy evaporate and therefor the temperature will drop . So i want to understand how does evaporation take place in water with temperature equals to...
  14. Bobfd7dbf

    Wet bulb temperature and water evaporation

    Thank you for your reply.. i am talking about if the air is not saturated and it passes over a stream of water with a temperature equals to the wet-bulb temperature of this air ..why doesn't the evaporation process take place in this case ??
  15. Bobfd7dbf

    Wet bulb temperature and water evaporation

    Hello Does water stops evaporation process when it's temperatue is equal to the wet bulb temperature of the ambient air ? If it doesn't,Why the water temperature does not drop less than the wet bulb temperature ? Thanks in advance.
  16. Bobfd7dbf

    Outdoor water-cooled chiller

    The client already have this design . So he want a water cooled chiller as the cooling tower is already exist with it's piping just he want to replace the water cooled chiller. The existing chiller is very old model with reciprocating compressors and it was made for this application.
  17. Bobfd7dbf

    Outdoor water-cooled chiller

    Boss88 There is already an existing cooling tower ,i see this pre-fabricated chiller plants offering cooling towers on the top of the container . So please tell me the specifications of the containers used and if i can fabricate one. ( it's material , design , ventilation requirement,..etc) I...
  18. Bobfd7dbf

    Outdoor water-cooled chiller

    Rputvin Thank you sir for your great support
  19. Bobfd7dbf

    Outdoor water-cooled chiller

    I mean by cruel industrial enviroment that there is a chlorine gas emissions ,chlorides, sulfur oxides and nitrogen oxides. The chillers which can be put outside according to most of the manufacturers is the air cooled chiller as it's designed for this but water cooled chillers normally placed...
  20. Bobfd7dbf

    Outdoor water-cooled chiller

    Hello I want to know if there is a water cooled chiller which can be placed outdoor in a cruel industrial enviroment.. most of the manufacturers i have seen dont have this option and cannot provide any treatments for water cooled chiller to be located outdoor. So if anyone have seen this feature...

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