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  • Users: HVAC68
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  1. HVAC68

    Water curtain - Pipe sizing

    Hi all, Can someone help me with the pipe sizing for water curtain ? HVAC68
  2. HVAC68

    VFD Centrifugal chillers - suitable for locations with very little wet bulb changes

    Are VFD Centrifugal chillers suitable and/or worth their investment and additional maintenance costs for locations where the wet bulb changes are very less ? HVAC68
  3. HVAC68

    Standby motor in AHU

    We have an application with a standby motor in AHU. Is it a standard practice to keep the belt "on" in the standby motor also, so that in case of airflow failure detected through the BMS, the standby motor takes over without the need for a technician to go and put the belt. OR Is it a...
  4. HVAC68

    Side withdrawal bag filters in AHUs

    Is it advisable to use side withdrawal type filters in AHUs. Some manufacturers recommend that front withdrawal type filters should be used. This would necessitate a mixing box or chamber before the filters so as to have access. Any thoughts on the negative aspects of having side withdrawal...
  5. HVAC68

    Maximum recorded wet bulb temperature

    What is the maximum recorded wet bulb temperature ? What happens if the wet bulb temperature exceeds 36.9 deg C (98.4 deg F) ? HVAC68
  6. HVAC68

    MCHX Coil

    How is the performance of MCHX all aluminium condenser coil being promoted by a few manufacturers ? The question is specific to the corrosion resistance with respect to the traditional copper tube / aluminium fins. Are there any independent studies conducted ? other than the claims of the...
  7. HVAC68

    R22 DX system - typical pressure test values

    Is there a document that furnishes the test pressure that the refrigerant piping has to be subjected to in the case of a DX system using R22 refrigerant ? HVAC68
  8. HVAC68

    HDPE pipe for refrigerant lines ???

    Have never heard a question like this. But, has anybody used HDPE pipe for refrigerant lines ? If yes, can I have a feedback please. If no, why not ? HVAC68
  9. HVAC68

    Starter panel - bottom plate required ?

    I have a 3.3KV auto transformer starter panel for a centrifugal chiller. The panel is a floor/pedestal mounted one, but there is no bottom plate. Cable entry is from top. Does this meet the NEMA standards or is it mandatory to have a bottom plate ? HVAC68
  10. HVAC68

    Mismatched AHU and CDU for DX system

    I have a direct expansion (DX) system, using R22 refrigerant. The AHU has been designed for 300KW and the air-cooled condensing unit has been designed for 214KW - reasons - probably, oversight ? I don't know. These capacities are based on a saturated suction temperature of 6 deg C. What...
  11. HVAC68

    Lift lobby/well pressurization

    What's the air changes to be considered for pressurization of (a) Lift well (b) Lift lobby HVAC68
  12. HVAC68

    High Frequency Induction Welding process & Fretz Moon Process

    Which process is better ? High Frequency Induction welding (HFIW), Fretz Moon (FM) or ERW ? The specification calls for ERW pipes. However, the manufacturer is doing HFIW process for pipes from 50mm dia to 150mm dia and FM process for 15mm dia to 50mm. Is there any inherent advantage or...
  13. HVAC68

    Staircase pressurisation - open door

    For a multi-storeyed building, how many "open" staircase doors do we consider while designing the staircase pressurisation system ? HVAC68
  14. HVAC68

    Duct fitting pressure drop

    The traditional method of calculation of duct fitting (bends, elbows, etc.) is based on equivalent length calculation. There is also another method wherein we use the velocity pressure and multiply the same with a coefficient (k). (h/4005) square x k. Needless to say, both produces different...
  15. HVAC68

    cable tunnel ventilation

    I have a cable tunnel which is 500m long and 2m x 2m cross-section. What's the air changes per hour to be considered for ventilation in normal mode and in smoke mode ? HVAC68
  16. HVAC68

    Post Graduation in Refrigeration & Air conditoniong

    Which Universities offer the post graduation in Refrigeration and Air-conditioning by Distance Learning method. I tried a google search, was not very helpful. HVAC68
  17. HVAC68

    Compressibility value of Jet A1 fuel

    I would like to know the compressibility value of Jet A1 fuel. Can somebody help please. HVAC68
  18. HVAC68

    Etronax

    Have anybody heard of "Etronax" ? Thanks HVAC68
  19. HVAC68

    Aviation fuel piping

    Hopefully, I am in the right forum to ask this question. We are installing a 18" (450mm) dia pipe underground (to be buried under the apron of an airport) for carrying aviation fuel pipe. This involves 100% radiography and X-ray testing, etc. There are some contractors who are able to do a...
  20. HVAC68

    Sprinkler for airport terminal building

    We are designing an airport project. The terminal building has a height of around 20metres (65 feet). Should we install sprinklers ? I am applying more of logic than a code issue here and hence my question - With a height of 20metres, by the time the fire reaches the top and operates the...

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