IAQ and Energy Lab–Conditions and Units

 

Questions

• For the calculations for mass flow rate of both ventilation air and exhaust air, I’m assuming that the exhaust air uses indoor air temperature and indoor air humidity ratio for calculations because its going from in to out. And I would assume thats the other way for ventilation air, is that correct?
• Also a clarification for the total heating gain, we were given the parameter of 280 kBtu/hr and the Excel file asks for units of Btu/hr, is it meant to be converted to that unit?

Response

• If the room is assumed to be thoroughly mixed then what’s leaving would be at the same conditions as what’s in the room.
• What’s coming in from outside almost certainly has the same conditions as outside.
• If you’re given quantities in different units, then converting between them is highly desirable.