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  1. wizzim

    AC Sizing - Actual vs. Rated

    so that 1 ton per 700sf rule you recommend is ALWAYS right even with all those changing loads? seems like it should grow a little every year when new computers get introduced? Look up the heat output of a computer monitor, if that puts me over on cooling load then I've got bigger problems...
  2. wizzim

    AC Sizing - Actual vs. Rated

    Discussing the finer points and best practices of energy modeling is best kept for a different thread. I'm curious to hear though what these mystery loads might be? But in short, yes you do plan accordingly for high temperatures based on TMY 30 year historical data (design to mean extreme, or...
  3. wizzim

    AC Sizing - Actual vs. Rated

    @Kiwi, the manufacturer (Trane at least) provides options for many many single family residential sized C/E combinations all AHRI rated. You can pick out the coil and condenser independently. I want to make sure I have enough sensible capacity like you said - concurrent loads - so I'm trying...
  4. wizzim

    AC Sizing - Actual vs. Rated

    I agree that rules of thumb will get the job done but they can't guarantee energy efficiency and comfort the way a properly sized unit can. Not to mention increased footprint and the added cost from larger equipment (furnace, coil, and condenser) passed on to the home owner that isn't...
  5. wizzim

    AC Sizing - Actual vs. Rated

    Is it common to shop out the performance for residential? It seems like there should be a straightforward way to calculate that derating. I will look into the ASHRAE section though. I read the 50% of excess latent capacity rule in ACCA Manual S. Background...In California where I work our...
  6. wizzim

    AC Sizing - Actual vs. Rated

    I am trying to confirm the exact procedure for properly sizing condenser and evaporator coil based on my Man J calculated cooling load. Question 1: I want to verify how to derate the capacity based on actual air entering indoor cool (EATa=75F) versus test conditions (EATt=80F). I was told...

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