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scion19801 · 10-15-18, 03:13 PM

so i have read this whole thread. great info in it but it leaves me with questions. i have a tiny house. 24 long x 8 wide x 10 high. it is built by me and was done so it is super tight. it about to get cold hear and i needed a way to get fresh air in while not losing a lot of heat. commercial units are to expensive, and i'm a handy person. i got a nice size of coroplast to use as my hx core. they are 12 x 12. considering using pc high static fans to fun the unit.

based on this formula:
room CFM:

Step One – Use the above Air Changes per Hour Table to identify the required air changes needed for the use of the room. Let’s say it’s a conference room requiring 10 air changes per hour.

Step Two - Calculate the volume of the room (L’xW’xH’).

Step Three - Multiply the volume of the room by the required room air changes.

Step Four Divide the answer by 60 minutes per Hour to find the required room CFM

i get 192 cfm. that seems aweful high.
another one i found said i needed 12 cfm. so i'm kinda stuck on how big to size my unit. i feel 12x12x8 hx core would be way to big. I havent ordered any materials to start this yet. Figured i better get more info on sizes i should be going with. i plan to put the unit in a storage area i have over my bathroom. looking to use 4" intake and exhaust ports. and possibly arduino to control my fan speeds. Any help is appreciated. I see this post is kinda old, so i hope i get a reply or may have to move to new thread. thanks all

p.s i also am a vapor, so the is a fair amount of moisture in my air, but that isnt to big of an issue, as i plan to have a way to dain the hx in some way. just thought i should add that in case it changes any thing.

10-15-18, 03:13 PM	#550
scion19801 Lurking Renovator Join Date: Oct 2018 Location: north east Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts	diy hrv help needed. so i have read this whole thread. great info in it but it leaves me with questions. i have a tiny house. 24 long x 8 wide x 10 high. it is built by me and was done so it is super tight. it about to get cold hear and i needed a way to get fresh air in while not losing a lot of heat. commercial units are to expensive, and i'm a handy person. i got a nice size of coroplast to use as my hx core. they are 12 x 12. considering using pc high static fans to fun the unit. based on this formula: room CFM: Step One – Use the above Air Changes per Hour Table to identify the required air changes needed for the use of the room. Let’s say it’s a conference room requiring 10 air changes per hour. Step Two - Calculate the volume of the room (L’xW’xH’). Step Three - Multiply the volume of the room by the required room air changes. Step Four Divide the answer by 60 minutes per Hour to find the required room CFM i get 192 cfm. that seems aweful high. another one i found said i needed 12 cfm. so i'm kinda stuck on how big to size my unit. i feel 12x12x8 hx core would be way to big. I havent ordered any materials to start this yet. Figured i better get more info on sizes i should be going with. i plan to put the unit in a storage area i have over my bathroom. looking to use 4" intake and exhaust ports. and possibly arduino to control my fan speeds. Any help is appreciated. I see this post is kinda old, so i hope i get a reply or may have to move to new thread. thanks all p.s i also am a vapor, so the is a fair amount of moisture in my air, but that isnt to big of an issue, as i plan to have a way to dain the hx in some way. just thought i should add that in case it changes any thing.