SteamyTea Posted August 14 Posted August 14 2 minutes ago, Iceverge said: The house i grew up in winter had 2 modes. Did it have lots of 'thermal mass'?
joth Posted August 14 Posted August 14 2 hours ago, SteamyTea said: Compared to what though. May sound an odd response but you would save the running costs by switching your MVHR off and the building airtightness would remain unchanged (may get a bit smelly indoors). Doing that is not the same as comparing a house with an ACH figure below 1 with MVHR and a non MVHR house with an ACH figure of 7. Volume of the house makes a difference as well. Compared to running the fans but without any heat exchanger. What else could it be? This is obviously not a comparison of a leaky house vs airtight with mvhr, but as an mvhr designer it's the only sane number to provide, given the instrumentation available to the device.
SteamyTea Posted August 14 Posted August 14 1 hour ago, joth said: What else could it be The options I showed. This is often the problem with energy comparisons. I wonder if anyone has correlated the efficiency of MVHR against HDDs.
Temp Posted August 14 Posted August 14 We installed a system even though our house probably isn't very air tight. Would do so again. Not for energy saving reasons but simply for the air quality improvement it gave us. First few nights it felt like waking up in a tent. 2
joth Posted August 14 Posted August 14 (edited) 2 hours ago, SteamyTea said: The options I showed. This is often the problem with energy comparisons. I wonder if anyone has correlated the efficiency of MVHR against HDDs. But an mvhr unit has no way of measuring how much energy the building would be using on heating if it was to be used under some other hypothetical conditions, such as if it were turned off. It has measurements for air flow rate and incoming/outgoing air temperature so the only thing it can realistically tell you is how much energy it has recovered from the outbound air in the operating conditions it is actually working under. Edited August 14 by joth
Iceverge Posted August 15 Posted August 15 On 14/08/2025 at 12:01, SteamyTea said: Did it have lots of 'thermal mass'? What SI units would you like me to quantity my reply in?
SteamyTea Posted August 15 Posted August 15 2 hours ago, Iceverge said: What SI units would you like me to quantity my reply in? The old MKS system will do, if you can make it fit. Maybe the GMS will work.
Gus Potter Posted Tuesday at 20:31 Posted Tuesday at 20:31 On 14/08/2025 at 10:57, Iceverge said: The house i grew up in winter had 2 modes. Good response! Often as a designer we seek a happy medium. Somewhere between your good points.. On 14/08/2025 at 10:57, Iceverge said: 1. Howling winds blowing through the cracks and freezing cold. 2. Stuffy as hell and damp running down the walls on calm days.
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now