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  • Users: econ2016
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  1. econ2016

    How to calculate the required pressure for Hydropneumatic tank installed at top floor of high rise?

    I have a booster pump (260psi head) at the ground level, and a hydro-pneumatic tank at 45th floor, top floor. How should I calculate the required the working or max. pressure for the tank? Assume city water 40psi, and pre-charge 30psi. Thanks!
  2. econ2016

    sidewall exhaust fan and fire damper on shaft

    Where can I find an installation detail for 4 levels of underground parking garage shaft (fire rated) sidewall exhaust fan and fire damper? Confused on this. googled but cannot see how the fan and fire damper installed. right now, I have to use out of wall fire damper installation because the...
  3. econ2016

    Chilled water riser Open loop or closed loop?

    I have a question: Condo building chilled water risers provide Chilled water for fan coil units. But at the lowest floor, there is a cleanout for each riser. This chilled water system can still be seen as closed loop? or open loop? This is important for selecting chilled water pumps, correct...
  4. econ2016

    How to size electric hot water tank for large retail store (for example, Walmart)?

    I know ASHRAE handbook has a table to calculate hot water demand in GPH. But I checked it and other websites, and found space category only for office, apartment, hotel, etc. But there is no data for retail stores. Which building category can I follow to size a tank for retails(Walmart size)?
  5. econ2016

    ERV instead of HRV?

    I know 'if you use a heating system more often than air conditioning, you need an HRV. If you use the air conditioning more than a heating system, an ERV is recommended'. But is it OK to use ERV for either heating season or for cooling season? Any reason for us to select ERV or HRV? The...
  6. econ2016

    Reverse acting thermostat for electrical room

    Hi, I have an electrical room to be installed a reverse acting thermostat, with setting point 100F. But I cannot find a reverse acting thermostat with 100F setting. H..Well product has only 86F. My design temperature outside is 87F in summer, so I want the setting to be 100F. Can anyone...

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