HAP DOES

[buddhika.nbd]

When designing DOES system in HAP 5.1, I have to design exhaust flow rate less than 90% from the supply air (fresh air). I couldn't find an option to reduce exhaust flow rate for each space than supply. Please help me to solve the issue.

 

[3DDave]

Where does the extra air go?

 

[Btutiful]

As 3DDave has pointed out, I think there might be some confusion of the concept of a DOAS system. DOAS usually implies 100% fresh air, which in turn implies that much air being replaced or exhausted. The only possible exception that one could argue to exist would be if the DOAS provided fresh air to multiple spaces and that some spaces exhausted only 90% while some other space (like a restroom) made up the difference in its exhaust. Could you explain the system as a whole a little more?

Unfortunately, I don't have any experience with HAP, so beyond trying to clarify the question, I can't help much.

 

[LittleInch]

Mass of air in after a certain time frame will need to equal mass of air out once the inside has pressurised otherwise you're breaking one of the laws of physics.... (conservation of mass).

 

[moideen]

What is your application? What is the requirement of exhausting the air? if don’t need uncheck the exhaust box.