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  • Users: walz
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  1. walz

    Duct Fittings Pressure Drop Values

    I always use Ashrae duct fitting database tables for the pressure drop calculations of duct fittings. I just happened to do the same calculations for a different duct material this time. Traditionally we always use duct material Galvanized Steel, for the pressure calculations, for duct as well...
  2. walz

    How to handle HVAC in a "massage room" at health spa

    Your system will be decided based on your design requirements. I have done many spa's, massage rooms for different kind of buildings. Yes it depends also upon the owner how much he can spend. That in other way tells what u want. Having an FCU means in your design requirement, you have to...
  3. walz

    Carrier HAP ??

    Zone load differs from the load which appears in the first page of output in HAP. It will vary largely typically if your outside air is not pre-treated. 160 People need a considerable outside air. and at 2:00 pm. what you see in the hourly zone loads is only the building loads and not the...
  4. walz

    Fire Damper / Smoke Damper / Fire + Smoke Damper

    the main problem in understanding these is . If damper itself is rated, should it be installed inside a rated duct or non-rated. or it should not be installed inside the duct, it has to be mounted on structure (fire rated wall etc) with ducts on either side of it.??
  5. walz

    Fire Damper / Smoke Damper / Fire + Smoke Damper

    I need clear differentiation between the functions of Fire Damper, Smoke Damper and Fire and Smoke dampers. What factors decide the use of each of these three Dampers. Thanks in advance.
  6. walz

    HVAC apps for smart phones?

    I have seeen alot of HVAC Apps which are avaiable for Android Users ... and also for iphone ... most of the them are paid which are really good and profesional, the ones which are free are just basic kind of thing .... I have not seen people using these kind of Apps with smartphonnes in this...
  7. walz

    Underfloor Distribution of Auditorium

    SAK9 and Chasbean If i put both systems in auditorium, will there be some problem? The whole auditorium is UFAD except the stage where its mixture. and if i do, can i do the stage with top supply, bottom return? (keeping in mind that rest of the area is supply at bottom). or if i have to go...
  8. walz

    Underfloor Distribution of Auditorium

    Hi all I have an underfloor distribution system to be designed to serve an auditorium, in the seating area, i am already using underfloor system for which i have raised floor, and return from top. While for the stage area, i have both options available i.e., i can either do underfloor or can do...
  9. walz

    Shooting Range

    I have an indoor shooting range of 300 meters length, 35.6 meters wide and 5.0 meters high to be conditioned. I have seen many guides which say that the flow inside the range has to be laminar. Moreover they say that in order to achive the laminar flow, the air velocity should not exceed...
  10. walz

    Equipment selection

    A true selection of exact sensible and latent load is never possible. As KiwiMace said, let the selection exceed both the sensible and latent by a bit. Thats the only way to get the proper selection.
  11. walz

    HAP software help

    OH ....thats very older version. Never mind, i will convert my HAP 4.3 and 4.4 version projects to 4.2 version and then will upload the E3A files
  12. walz

    HAP software help

    I have been using HAP for more than 7 years, and have faith in it. Waht i suggest you is that rather than reading a practical example, i send you a HAP project archived file (.E3A) which you can retreive into Your HAP program and there you can see all the spaces, systems and plants that are...
  13. walz

    HAP 4.41 - WEATHER FILE

    Only hackers can do it put same question on the software engineering forums. I had to do the weather simulation for Qatar. but HAP didnt have the qatar weather fil. I faced the same problem. But what i did was that i used the nearby station weather file which is closer to qatar weather.
  14. walz

    Primary/secondary pumps

    IF the primary pump is variable speed and is oversized also. Why cant you run it at lower speed to provide the design flow. In case of part loads anyway its going to run at reduced speed.
  15. walz

    Which is the best book for BASIC THERMODYNAMICS

    McKonky from McGraw Hill Seiers
  16. walz

    Inlet and outlet to a condenser water pump

    I see the same on the chilled water pumps as well
  17. walz

    Cooling large Machine Shop in KSA

    You have lots of glazing on all sides of exterior walls. If the max temperature outside is around 116 def F. (which i suppose it would be) cuz i dont know which paritcular area is this in KSA. Go for DX Ducted Split Units. Size them based on total electrical load per area which should be not...
  18. walz

    Interview help for HVAC engineering position

    Study Psychrometrics .... thats the ABC of HVAC. Get a software ... preferabblay HAP (Hourly Analysis Program) try to familirize yourself to it ... For Entry Level interview, general questions are asked. One of the thing is they ask weather you can use any software??
  19. walz

    Efficiency of ducted split system vs packaged system (AC only)

    Other Specs are the heat exchanger efficiency of condensor and evaporator in both split and package. thats what make the cooling capacity.
  20. walz

    Efficiency of ducted split system vs packaged system (AC only)

    The conditions which shaunco is assuming will not have much difference in the refiregerant piping lengths. He has mentioned the ducting length for both to be the same. In actual its not, Ducting of Ducted split is much less than a package unit. But he is assuming for both of these units to have...

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