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  1. BACN_mechanical

    Minimum Outdoor Air for Rooftops

    Hello everyone, Do you know if there is a minimum percentage of outdoor air for rooftops? For example, if after calculating the supply air flow and outdoor air, the percentage of outdoor air is 5%. Is it possible for the roof to provide that percentage of outdoor air or less? Is there a problem...
  2. BACN_mechanical

    DOAS vs MUA

    Hi everyone, I'd like to hear your ideas and thoughts about the differences between DOAS and MUA's, and when each should be used. It's clear to me that a DOAS generally supplies oudoor air to AHU's, fan coils, VRF evaporators, heat pumps, etc. In turn, a DOAS helps to cool, dehumidify the...
  3. BACN_mechanical

    HEAD PUMP - MAXIMUM OPERATING PRESSURE

    If you have a chilled water system with only primary pumps serving a tall building. Also, the expansion tank is located at the top of the building. How would the maximum working pressure be affected in the following arrangements?: a. Locating the pumps on the first floor b. Locating the pumps...
  4. BACN_mechanical

    DIVERSITY FACTOR - HEAD PUMP - CHILLED WATER SYSTEM

    Thank you EnergyProfessional and LittleInch Now I understand, thank you for your prompt answers and comments that allow me to learn more.
  5. BACN_mechanical

    DIVERSITY FACTOR - HEAD PUMP - CHILLED WATER SYSTEM

    Thank you EnergyProfessional for your answer Yes, I'm indeed in the southern hemisphere. The value of DT 10 and other values (water flows, diversity, capacities, etc.) are from a fictitious example. The idea was to understand how the head pump would be calculated and the use of the water...
  6. BACN_mechanical

    DIVERSITY FACTOR - HEAD PUMP - CHILLED WATER SYSTEM

    Hello everyone, I am new to forums, I hope you can help me solve a question that I have had for a long time, which is not directly found in books or websites. I have a variable primary chilled water system as you can see in the attached image, it's just a small sketch. Don't pay too much...

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