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  • Users: sridhar1312
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  1. sridhar1312

    Bleed off from Cooling tower

    Attention: atlas06 Haven't come across dolphin system can you send link please
  2. sridhar1312

    Thermal VAV versus Powered VAV

    Thanks for the inputs. please let me know for DX type equipment where there is no VFD on the air handler Thermofuser is more appropriate.Am I correct.
  3. sridhar1312

    Pumps suction and discharge lines

    Respected MJC Thanks for the valuable input.Yes we always size pipes limited to 7 fps for the cooling water and chilled water.
  4. sridhar1312

    For flow control which valve is appropiate

    For flow control at the outlet of chiller and condenser and at the inlet of cooling tower cells we have been using Globe valve or Balancing valves to set the correct flow across respective equipments. One of the vendor wants to use butterfly valve as isolation as well as flow control, Is it...
  5. sridhar1312

    Pumps suction and discharge lines

    The pumps we re talking about is the Centrifugal Back Pull out pumps for chilled water and cooling water application. Suction of the pump over sizing is understandable for ensuring positive suction to pumps. Discharge length is hardly 2 or 3 meters and in this line isolation valve and non...
  6. sridhar1312

    Thermal VAV versus Powered VAV

    Can you please let me know the difference between the thermal diffuser and Powered VAV. Where it more apt to use Thermally actuated diffuser and where powered VAV box. Can Thermal diffuser can be used where there is no VFD/VSD on AHU fan Motor.
  7. sridhar1312

    Pumps suction and discharge lines

    We normally size the pipes and isolation valves strainer or suction strainer cum flow straightener from suction of the pump to the suction header as the same size of suction size in the pump. Similarly the discharge line up to header with isolation valve and non return valve is same size as the...
  8. sridhar1312

    Reason for Pressure drop between the discharge of chiller and Suction

    We have Chilled water system with Three Chillers catered by Four Primary Pumps and four Secondary pumps primary pump flow is 155 Meter cube per hour, where as secondary pump is 117 M3 per hour. The suction at Secondary pump is negative Inlet pressure to Chiller from primary pump is 1.8 Kg/cm2...
  9. sridhar1312

    VAV Systems and Air Changes

    mauricestoker (Mechanical) Room air changes will be 13 to 15 for any normal air conditioned space. This will increase as we go for Class 10000, class 1000 class 100 etc. Fresh air change shall be based on ASHRAE 5 cfm per person and 0.06 cfm per square feet of the area, if it is designed for...
  10. sridhar1312

    Multiple cooling towers - Cooling tower staging

    We feel having on/off motorized valve in the outlet of the condenser&chiller to stop low whenever the respective chiller is not in operation. And cooling tower can be programmed based on leaving temperature of cooling tower i.e cooling water inlet. Based on the cooling water inlet sensed from...
  11. sridhar1312

    Hot well /Cold well tank sizing for chilled water application

    The Hot well cold well tank is for Paper mill where AHU FCU's located in all control rooms, I/O Rack Rooms drive Rooms offices and MCC rooms. There is small quantity for process cooling also. Earlier they were having only primary pump concept with expansion tank located at top most point of...
  12. sridhar1312

    Suction strainer cum flow straightener

    For pumps off late many of the consultants suggest Suction strainer cum flow straightener instead of conventional Y-strainer or pot strainer( for larger diameter). Request to elucidate with the specific advantages and limitations of the Suction strainer cum flow straightener.
  13. sridhar1312

    protective coatings on ACCU in coastal area's

    Carrier is offering spine fin all (tube &fins)aluminum condensers. We have to see how it has corrosion protection against sea & salty atmosphere.
  14. sridhar1312

    Bleed off from Cooling tower

    Is there any formula to ascertain the bleed off recommended for cooling towers to ensure concentration build up in the cooling water system.We find many of the cooling towers does not have the provision for bleed off thereby the refrigeration system operates almost same condensing temperature as...
  15. sridhar1312

    Solar radiation heat transfer on building

    Best way to do the heat load for summer time and if the tank is inside under roof. Then it is better to treat underneath roof with Radiant barrier film which reduces the radiation heat down to tank substantially. If the tank is above ground in open space then also external radiant barrier film...
  16. sridhar1312

    Water Blow-Off During Humidification

    The velocity across the humidifier must be more than 500 feet per minute or the spray density may be high. If the spray is misty and fine like steam then carry over should not happen. If the velocity across the filter is measured when the steam humidifier is in operation it will give clear clue...
  17. sridhar1312

    Heat rejection: Air Cooled Chiller vs Cooling Tower

    Some thing is missing? At 95°F above i.e hotter days you have issue of performance.Normally the wet bulb depression(DB-WB)will be highest in summer and cooling tower ought to perform better during this season. From the various data it appears the cooling tower capacity is derated due to aging...
  18. sridhar1312

    Air flow exceed rated CFM for HEPA filter

    In most of the Air handling applications the first thing to be done is tuning your speed of the FAN to bring it closer to the designed cfm. The design static will be higher considering the worst case of dirty filter conditions for all filters. In case of HEPA filter when it is dirty the static...
  19. sridhar1312

    Hot well /Cold well tank sizing for chilled water application

    Thanks for the input. The Paper Mill has 1000 TR steam fired Vapor absorption machine(VAM) and 300 TR steam fired VAM. The low side load is around 1000 TR peak. Presently the tank we have is 40000 Liters with 1000 L for hot well and cold well capacity of 30000 Liters.We have cold well volume...
  20. sridhar1312

    Building Temperature- Selection

    Yes agree with Chris Conley, with sufficient air changes we can ensure 4 to 6 degrees above ambient or with Direct evaporative cooling or Indirect Direct evaporative cooling (IDEC)the temperature can be brought down closer to wet bulb temperature or lower than wet bulb when IDEC is used as we...

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