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  1. Hydronican

    Does any natural draft appliance must have a draft hood?

    I'm working on the flue vent design where there are boilers and furnaces. Some appliances clearly specify a draft hood, but the others do not say anything about draft control devices. I checked the code. It looks like it depends on appliance combustion chambre design (positive, zero, or negative...
  2. Hydronican

    AC for swimming pool area

    I don't think swimming pool area needs an AC system, ventilation and dehumidifying systems are enough. ____________________ Comfort has a price.
  3. Hydronican

    radiation & free convection to internal air temperature

    Don't you think ASHRAE clear sky model can give you solar irradiation onto every sides of your box? Radiant Time Series Method will give you solar irradiation on every surface at every hour. ASHRAE 2005 Handbook has the basic information. ____________________ Comfort has a price.
  4. Hydronican

    Energy Utilization INdex

    It depends on many factors: insulation, fenestration, HVAC system type, and outdoor air requirement etc. The best answer to your question is building energy simulation. Some simple methods are also avaliable, such as bin method, degree-day method etc. Check ASHRAE Fundamental for information...
  5. Hydronican

    Question about Sizing HVAC split

    Coils are manufactured for differentr design concepts. If a coil is mainly for sensible load, it will have high S/T ratio, less rows, higher air flow, high EER, higher approach (12 ~ 15oF typical), an higher leaving air temperature limit (such as 47 oF). A coil mainly for latent load will...
  6. Hydronican

    Short-Term Ventilation Design

    Thank you, bigAlittlee. ____________________ Comfort has a price.
  7. Hydronican

    Short-Term Ventilation Design

    Hello Everyone: From time to time I'm involved with the ventilation design for assembly hall, which is usually for events. ASHRAE 62.1-2007 has description on this kind of ventilation design under short-term condition and provides two equations to calculate time period for average...

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