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Type: Posts; User: lucaspenalva

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  1. Because your readings are not purely static...

    Because your readings are not purely static pressure - there will be also velocity pressure due to turbulence and/or incorrect use of instrument.
  2. Yes, you can use degree days method. If you...

    Yes, you can use degree days method.

    If you don't have good correlation between the CDD & the Electrical consumption, try and find another variable to add into the regression analysis.
  3. Chilled Water System with a return loop in a tall building

    I have just seen an old (1980) Chiller Water System Design with the attached layout.

    Does anybody know why would the return system be designed as shown in the picture?
  4. It is a 4 m box that stores a Saint sculpture...

    It is a 4 m box that stores a Saint sculpture made of out clay.

    Its indoor conditions must be maintained at 20-22C / 40-50% RH.

    I wonder what is the latent heat gain and what's the air...
  5. Parallel fans attending different zones

    Hi,

    My company recently installed 2 fans for stair pressurization.

    They are located at the same machine room that act as a common plenum.

    Each one attend different stair/zone.

    When both...
  6. Air properties in a closed (art) niche

    Dear all,

    What are air properties and how it varies in a completely tight box without infiltration points - for example, art niche where art pieces are kept inside?

    Talking about art niches, is...
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    Do you have an idea why isn't it big? In...

    Do you have an idea why isn't it big?

    In brazil, mini-splits represent more than 80% of the market share!

    In residencial applications, it's extremely rare to see centralized AC system. More...
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    What's US mini-split market share (approximately)...

    What's US mini-split market share (approximately) ?

    I live in Brazil and it's widely used, specially for residential application (i'd say 95% of air conditioned houses use mini split).
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    Maybe washing filters every 6 months wouldn't be...

    Maybe washing filters every 6 months wouldn't be the best recommendation if the application is not known.

    It varies a lot depending on the application.

    For example, a barbershop, petshop, hotel...
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    I'm really sorry for not being more clear. ...

    I'm really sorry for not being more clear.

    What I meant as mechanical room was a dedicated room for AC system. Nothing else, no paint cans, cleaning solutions, chemicals.

    Also, my initial idea...
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    Yes.

    Yes.
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    Yes.

    Yes.
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    From what i've seen, it's mainly for maintenance...

    From what i've seen, it's mainly for maintenance purpose - it's much easier this way.
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    What you mean by "just relief air from the...

    What you mean by "just relief air from the building"?
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    The only equipment in the room is the cooling...

    The only equipment in the room is the cooling equipment
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    I'm from Brazil, local code allows for it and...

    I'm from Brazil, local code allows for it and i've seen many. (i'm not saying it's right or wrong)

    Here's an example of this application:

    798702

    It's an air-cooled self-contained unit.
    ...
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    Mechanical Room as Return Air Plenums

    Hello there!

    Hope everybody is doing fine.

    What are your thoughts about using mechanical room as return air plenums?

    Advantages? Disadvantages? Personal experiences? Tips?

    Thanks and have...
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