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Recent content by cme

  1. cme

    Hospital HVAC Design

    12 ach isn't enough for isolation rooms ..... min 15 ach ..... and w/ 150 cfm differential ...... sealed walls/windows ..... and door w/ tight gasket as far as insulting ...... the way you can across .... ok mr cme ..... that doesn't sound professional at all
  2. cme

    R12/R134A refrigerant relief line

    i would vent each chiller independently ...... agreeing with lilliput
  3. cme

    Freon pipes pass through electric system room

    check w/ your elec engineer with nec for clearances required for their gear personally, i would not run it over electrical gear
  4. cme

    hvac control diagrams how to make it?

    input (to the panel) output (from the panel) digital - contact closure analog - modulation
  5. cme

    Yoga Room Temp Control

    you can get up to 130 degf disharge temp w/ gas heat use a down and dirty cost-wise system ...... packaged rooftop unit, constant volume with programmable stat
  6. cme

    Hospital HVAC Design

    ashrae 90.1-2004 6.5.2.1 exception b i would cringe on using vav regarding infection control
  7. cme

    Hospital HVAC Design

    atlas, you are one arrogant person who recommends his own threads as helpful you are incorrect in your statements
  8. cme

    CV and VAV in hospital

    vav can be used in administration and kitchen patient rooms are typically fan coil units with a dedicated makeup air unit for osa ventilation treatment is cv reheat pressure differential is established via the difference between supply and return/exhaust ...... 75 cfm in most cases
  9. cme

    Hospital HVAC Design

    the door to the isolation room is closed in design show me where cv reheat is in violation for healthcare
  10. cme

    Boilers and pressures

    calculate the pressure from the static height of the highest point to the expansion tank then add 3 psi you should also be pumping away from the boilers the expansion tank is connected to the suction side of the pump via the air separator (rolairtrol) b&g has a program to calculate expansion...
  11. cme

    Hospital HVAC Design

    atlas, all new healthcare projects are cv reheat ..... vav boxes set to constant cfm with vav you cannot maintain pressure relationships better think thru that again large healthcare is the vast majority of my work
  12. cme

    Maximum Air Exchange Rate per Hour

    100 ach is no problem as i have engineered systems n the past ..... use anemostat hcr diffusers mounted perpendicular to the hoods
  13. cme

    Hospital HVAC Design

    in a nutshell: all systems are constant volume reheat no duct liner solid double wall units ducted returns 75 cfm differential for + and - spaces ..... use aia guidelines to determine what room requires some states have their own guidelines ..... like florida
  14. cme

    Type ERW or Type S pipe

    Which do you specify for chilled and hot water systems?
  15. cme

    P-trap at air-handling unit drain connection

    trane has details for draw thru and blow thru on their website
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