The wife keeps opening the window in our upstairs bedroom. Ja, I know what you're thinking... stack effect. Well, it's more than that.
When I built the house, I ducted the HRV make-up air directly to our bedroom so that we would have fresh air without having to open a window. If the bedroom window is open and the door closed, the HRV vacuums the air out of the rest of the house and pressurizes the bedroom, most of which then goes right out the window. This upsets the balance of the HRV leaving the downstairs in a negative pressure situation. A fan assisted stack effect, if you will.
The funny thing is that sometimes air comes into the bedroom. It's a double hung window which can sometimes let air both in and out. If the smoke from my chimney is hanging low and the breeze blowing the wrong way, I can smell it in the bedroom. The bedroom window is on a different wall from the HRV intake so the wind that blows into the bedroom probably causes a low pressure on the HRV intake.
The solution appears simple... keep the window closed. How do I explain it in terms she can understand? She's not buying the "fan assisted stack effect" theory because in her mind the myth is busted by smoke entering through the window. I really don't understand why the window needs to be opened in the first place since the HRV fills the room with fresh air that exchanges the stale air through the magic that is the HRV.
When I built the house, I ducted the HRV make-up air directly to our bedroom so that we would have fresh air without having to open a window. If the bedroom window is open and the door closed, the HRV vacuums the air out of the rest of the house and pressurizes the bedroom, most of which then goes right out the window. This upsets the balance of the HRV leaving the downstairs in a negative pressure situation. A fan assisted stack effect, if you will.
The funny thing is that sometimes air comes into the bedroom. It's a double hung window which can sometimes let air both in and out. If the smoke from my chimney is hanging low and the breeze blowing the wrong way, I can smell it in the bedroom. The bedroom window is on a different wall from the HRV intake so the wind that blows into the bedroom probably causes a low pressure on the HRV intake.
The solution appears simple... keep the window closed. How do I explain it in terms she can understand? She's not buying the "fan assisted stack effect" theory because in her mind the myth is busted by smoke entering through the window. I really don't understand why the window needs to be opened in the first place since the HRV fills the room with fresh air that exchanges the stale air through the magic that is the HRV.