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  1. 123131415

    Sqaur diffuser plenum sizing

    Dear member, I am working with project wherein square diffuser is supplied by other vendor/manufacture and plenum box above diffuser is supplied by duct manufacture. Plenum box is suppled though the thermally flexible duct which served by CAV/VAV. Diffuser schedule Neck size flow 150 x 150...
  2. 123131415

    REQUIREMENT OF COOLING TOWER IN WATER COOLED CHILLER SYSTEM

    water cooled Screw Chiller of 2nos x 125 TR + 1standby proposed @ chilled water supply/return 44 / 55 deg-F. Heat rejection of cooling tower 312.5 TR considering 25% for compression. Wet bulb temperature for site is 81.5 deg.F . my question is utility condition at battery limit will eliminate...
  3. 123131415

    REQUIREMENT OF COOLING TOWER IN WATER COOLED CHILLER SYSTEM

    Dear member, I am working with Petro -chemical plant wherein central colling tower is available for entire plant (process and non -process building). We are purposing water cooled screw chiller based on total thermal load of building for comfort air conditioning for non- process building (i.e...
  4. 123131415

    Control Air Damper selection

    This Post is regarding selection of control damper . Duct pressure classification given as 2 inch w.g.. Usually control damper rated for the maximum pressure and maximum velocity, beyond which damper may not performed the indented purpose and hence the operating condition shall not exceed...
  5. 123131415

    operation theater apparatus dew point

    ASHRAE standard 170 specify operation theater temperature should be 68F and RH (30 -60%). however, in may case, indoor design condition is 68F DBT and 50+/- 5% RH. I am using E20 form to calculate thermal load for the operation treater. To selected the apparatus dew point I could not find the...
  6. 123131415

    F factor in HAP 5.11

    how to model F factor in HAP when slab on grade is applicable to the building thank you
  7. 123131415

    cooling design profile temperature in HAP 5.11

    why design profile temperature for month of july and august are same for MINOT IAP in HAP 5.11https://files.engineering.com/getfile.aspx?folder=b895a188-1765-4aad-8518-0a998efd6baa&file=SSN2587.tmp.pdf
  8. 123131415

    Designing in Extreme Annual Design Conditions & Carrier's HAP 5.11

    Dear member, I am designing process equipment enclosure for the following design condition Annual cooling (DB/MCWB) – 91 F / 69.2 F and inside to be maintained at 1040F Annual heating (DB) – (-17.7 F) and inside to be maintained at 50F Evaporative colling (WB/MCDB) 73.5 F / 84.4 F and inside to...
  9. 123131415

    switch gear room pressurization & infiltration

    thank you all of you for support help and time.
  10. 123131415

    switch gear room pressurization & infiltration

    I am new to HVAC industry and assigned task to design air conditioning system for 33 KV substation wherein switch gear room has to be maintained positive pressure of 30Pa. Equipment heat gain is of 250kw and room to be maintained less than equal to 25C deg and RH of 75% max.my question is how...
  11. 123131415

    Flexible air duct – maximum length

    Dear member What shall be maximum length of flexible air duct(used to connect diffuser and coller) as per smacna.
  12. 123131415

    Acoustic insulation in supply & Return Duct up to 3 Mtrs

    Dear member, It is general practice to provide 3 mtrs Acoustic insulation in supply and return duct from AHU. Irrespective of AHU capacity. i.e CFM. However, low capacity AHU/FCU/Split Ducted unit may not required upto 3mtrs acoustic insulation. Hence, on what basis acoustic insulation shall be...
  13. 123131415

    Air release valve / air cushion valve

    Dear memeber air cushion valve and air release valve is same?
  14. 123131415

    swirl diffuser and ceiling diffuser

    Dear member, what is basic difference between swirls and ceiling diffuse(sq and circular), technically. how one can identify which one to be used.
  15. 123131415

    fire damper / Volume control damper

    Deal all, thanxs to all for ur prompt response.
  16. 123131415

    fire damper / Volume control damper

    I come cross damper schedule (design by others). They are mention minimum flow rate and maximum flow rate, min velocity, max velocity, and static pressure drop. i.e AHU supply flow is 4695 l/s. AHU Machine – VAV type , Air distribution by using Variable air volume box . Fire Damper schedule. Min...
  17. 123131415

    Car parking drainage / flooding in basement

    Mr. PEDARRIN2 Thanx for prompt useful advise. i will elaborate more to have better understanding of my problem. as i mention that 7 story building , strom water from roof , waste water and sewage up to level 1 are directly going to existing manhole at level 0.from level 0 ,level -1 and level -2...
  18. 123131415

    Car parking drainage / flooding in basement

    Dear member, My new building(area 355m x 125 m) of 7 story and 3 story (level 0 level -1, level -2) below the grade and used for car parking purpose. Dry – wet well arrangement (located in level -2) is to be considered to dispose parking drain, to avoid flooding. Rain fall intensity is in my...
  19. 123131415

    out door design temperature in india

    Thanx for your prompt response Firstly I am not using any software to find outdoor design temperature. By the way I check with HAP it has limited number of city for which design temperature is defined. I don’t have data for aforementioned city
  20. 123131415

    out door design temperature in india

    Dear all i am new to this group also new in HVAC industry. outdoor design temperature in india published by ISHARE and IS-7896 is limited for the approx 61 major cites of india. i have to design HVAC system for North east india i.e imphal,skkim manipur etc.also for north india jammu & kashmir...

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