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  1. irfansiddiqui

    Plastic recycling material issues

    Hi all, We are using a recycling plant to recycle plastic bags (LDPE) These bags were used to store and transport H2SO4. While transportation H2SO4 fell from the containers and dried on LDPE bags. We washed those bags but even then some particals remained stick there, which we considered as...
  2. irfansiddiqui

    how can we become people specific? what can we do for humanity?

    Hi All, This is not a technical question, but I thought it is worth to ask for.... I am a mechanical engineer, basically an HVAC and plumbing designer for building services.. I just wanted to ask a question, HOW CAN I DO SOMETHING FOR HUMANITY USING MY FIELD(i.e. mechanical design engineer for...
  3. irfansiddiqui

    Pressure Test For Chilled Water System

    Test pressure is usually 1.5 times the design pressure for minimum 1 day
  4. irfansiddiqui

    what is maximum supply air in room without return?

    1. provide supply cfms as per the load calculation and provide door louvers so that they can come out from them into other space where you can provide return for all of them, 2. Discuse with the architect and propose perforated ceiling then you will not require any return diffusers, or if it is...
  5. irfansiddiqui

    calculation of AHU

    what is the resulting parameters you want?
  6. irfansiddiqui

    Return Plenum Box

    no need of any box, if it is office space, void area in the ceiling will act as your return plenum. its fine and in practice. for air flow balancing - you can do it with the dampers in supply duct
  7. irfansiddiqui

    Chilled Water Piping Suppot/Thermal Expansion contraction

    I will go with the clevis support,, thanks ZDR1985.
  8. irfansiddiqui

    Chilled Water Piping Suppot/Thermal Expansion contraction

    Kindly also suggest if - Clevis hanger can accommodate for the expansion of 1 inch in whole piping of 3000 inch(250 ft)?
  9. irfansiddiqui

    Chilled Water Piping Suppot/Thermal Expansion contraction

    Kindly check the calculation, regarding details of hangers and support what should i do?
  10. irfansiddiqui

    Chilled Water Piping Suppot/Thermal Expansion contraction

    Dear All, I have an HVAC system of 300TR Chiller with 2 pumps(1duty and Stand by, the structure to cool is a steel structure ( a typiccal Laundry Firm) in which i have to hang the duct and piping, I am new to this type of supporting can any one help me out, please refer me to some supporting...
  11. irfansiddiqui

    DRV Selection Calculations

    Dear All, We have designed a chilled water system and we have used Double regulating valves in this system now the client is requiring selection calculations of DRVs. I need to perform DRV selection calculations, can use this formula Kv = Flow Rate (m3/h) / Δ P (Bar) , If yes how can i...
  12. irfansiddiqui

    Spliter Damper , Acoustic insulation ON P3 Ducts

    Does spliter damper required for ducts of P3 - Pre insulated ducts - our contractor is saying he has not installed any spliter damper on P3 ducts? If not is there any code permitting this thing? Does Acoustic insulation required on P3 ducts? P3 ducts are pre-insulated duct.
  13. irfansiddiqui

    Removing Margarine from plastic Bags

    Dear All, I want to recycle waste plastic bags but before recycling we have to wash the bags so that margarine can be removed from the bags, i have tried to wash it with detergents but there is problem of stickiness in the recycled chips. can any one guide any formula of chemical?? which can be...
  14. irfansiddiqui

    CAN Fertilizer Plant - HVAC

    Dear Experts, We have a CAN fertilizer company in our city, whose plant temperature rises to about 70Deg C due high temperatures of steam lines and high temperature product output,which is not suitable for workers Company officials want to have a proper HVAC system But, Should we go for an...
  15. irfansiddiqui

    Hydronic Piping - Valves PN16 and Flange PN10

    Dear all, We are installing an HVAC system, recommended valves are of PN16 rating but there is no recommendation for flanges, now we are installing piping network - we are installing PN16 valves but we want to install flanges of PN10 is it alright?? Regards,
  16. irfansiddiqui

    ACCU working

    Depends
  17. irfansiddiqui

    Thermal storage tank in chilled water system

    no need to vent the tank. you can put automatic air vents in chilled water supply line
  18. irfansiddiqui

    Sizing a pre-heat coil with a vav system...

    yes keep it simple as chasbean1 has told, save cost
  19. irfansiddiqui

    HVAC Test and Commissioning

    Cry22 is right. But Manu68 if you are not going for any competition you dont have to bother it just ask the contractor to do air water balancing and get those reports they will help you out for managing your system if you are using building management system then hire any CxA.
  20. irfansiddiqui

    Natural ventilation question.......

    check the local codes, Now a days sealed pack windows/door are designed in a building which must have mechanical ventilation system or simply HVAC with in them. a sealed pack building with out HVAC system always flops

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