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  1. Ziggypump

    cooling load Diversity

    Utilizing "Sum of Peak Loads" will already over size your system. Depending on the number of spaces, exterior wall placements, space usage; peak loads will occur at differing times of the day. Lunch rooms would peak around noon, offices can peak anywhere between 1:00 and 4:00 typically...
  2. Ziggypump

    Sizing Duct by Equal Friction Method?

    MP, careful with the filters. When sizing a unit, you size the ESP, external static pressure. The filters are usually internal static pressure. ESP + ISP = TSP. ISP is internal to the unit (RTU, AHU...) and while you can get an idea, every manufacturer has a different number due to unit...
  3. Ziggypump

    swimming pool ventilation for dehumidification without Air Conditioniong or desiccants.

    If exhausting properly to remove any added moisture to the room from the pool, the room would have the same RH as outside. Which means, on a very humid day, it will be very humid inside. This is a natatorium, calculate how much water is evaporated off the pool to determine the optimal flow...
  4. Ziggypump

    Massage room ventilation

    If it's an occupied space, then code requires ventilation. Code allows you to find the closest related space type to use. Also realize that code may not state a required ventilation rate, but an exhaust rate will be required. If you exhaust, you need to make-up, and that's how ventilation...
  5. Ziggypump

    VCD installation

    Required, probably not. To make life easier for the balancer, YES.
  6. Ziggypump

    air pressure sensor in apratment bldg laundry

    OK, dumb question here, but if you are exhausting 3000 cfm (assuming all dryers are on) and only supplying 1600 cfm, even with increasing OA, where is the rest of the room make-up air coming from (1400 cfm)? You stated that the waiting and laundry rooms are separated by a fire door, which means...
  7. Ziggypump

    air pressure sensor in apratment bldg laundry

    How is this pressure sensor to work? Wouldn't a differential pressure sensor (2 of them) work better? This way you could make the room negative in relation to the corridor. Opening the door will always void a pressure setting, as now there's a big hole to allow air to pass. Now that being...
  8. Ziggypump

    administration bldg plus locker room tied up in one system

    Review the mechanical code like trash said, specifically the ventilation section. Code doesn't require outside air to toilet and locker rooms, only exhaust. If the rooftop unit supplies as much or more outside air than is exhausted, what's the problem? If it supplies less, then increase the...
  9. Ziggypump

    ammonia ventilation

    Well that's a loaded question. What would you want it to be? This should be part of the design that you come up with.
  10. Ziggypump

    HAP report

    Looks like you don't have a heating air flow rate, just cooling is used to determine the airflow. Double check the heating load system as the heating coil on the terminal uni sizing data goes from -17.8 to -17.8. This would lead me to believe that this section is for the fan power and...
  11. Ziggypump

    ammonia ventilation

    CHECK THE CODE!!!! Per IMC 10 ACH is not enough, 30 ACH minimum. Read the code, check out the IIAR standards. Ammonia is not something to trifle with. Fix the leak, as this is probably contaminating the product in the freezer.
  12. Ziggypump

    HVAC exhaust air temperature?

    HVAC exhaust? Like toilet room air, or relief air? Either way I would assume the exhaust would be dependent upon the room air being exhausted. If the room is set to 21C then I would not assume 70C exhaust air.
  13. Ziggypump

    Minimum outside air on VAV

    The ventilation calculations have a very good hold on this question. 62MZCalc, while a little difficult to initially understand, does a fabulous job in illustrating the amount of outside air at the design condition. And the International codes follow the same path, with differing equations to...
  14. Ziggypump

    Carrier's Hap - Airflow rates in summary report

    Difference between Sum-of-Zone-Peaks, and System-Peak calculations here. If done properly, the flow and load requirements when taken at each VAV box design should be more than the overall system size. Think of it this way. A Zone facing East will have a maximum load during the morning, while...
  15. Ziggypump

    Open loop air system vs closed loop

    Let me get this right. You need the unit to supply 2,000 cfm. You want to cycle some of the air back to the return of the unit. So lets say the unit needs to supply 3,000 cfm, so 1,000 cfm can be returned to the unit. Your entering air temperature will be higher than ambient in the winter...
  16. Ziggypump

    Add heat for ground souce heat pumps?

    You are wanting a Hybrid geothermal system. What is the loop temperature in the winter? It is possible the heat pumps were sized incorrectly for the water temperature provided to them. But it is also possible that the setback temperature is too great. A heat pump system should have a 5 deg F...
  17. Ziggypump

    Effects of change of R-22 to R-410A

    You purchased a new air conditioner, was the cooling coil and piping replaced too? While R-410a is the new refrigerant, it will not work on equipment designed for R-22.
  18. Ziggypump

    Turning vanes in Elbow

    I'd be willing to bet at least 1.
  19. Ziggypump

    Fire Dampers insulation

    rogzog, just had to deal with this on a project of mine. Not all fire/smoke dampers use a fusible link. There are some out there with an internal temperature sensor or something that will activate the motor. We were expecting a fusible link for the fire damper portion, but it's not there. So...
  20. Ziggypump

    Mechanical/Pump Room Question.

    urgross, I'll concede that this may be applied to the mechanical room, but with the way the code is worded, I will argue that 406 only relates to ventilation in regards to natural ventilation. An exhaust or supply system to allow 0.02 cfm/sf is allowed, but this is not ventilation, the same way...

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