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trebor12345
trebor12345
@trebor12345
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Estimable Member
Joined: Feb 26, 2024
Last seen: Jun 8, 2026
Profile Activity
Topics: 15 / Replies: 142
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Reply
RE: Air Changes per Hour - ACH and the MCS requirement

My Air Permeability is : 2.35 m³/(h·m²) @ 50 Pa. So if I use your magic factor: 2.35/20=0.1175. According to my SAP report the overall Infiltration ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

I have been looking at ACH and the requirements of BS EN 12831-1:2017. Whilst information is sketchy because I don't have full access to the standard...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

The first year we were at the property we didn't run the MVHR with no problems. Currently the property is at 21/22C (24/7) and only 33% RH with the M...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

MatWin I am also a B. Below is a summary of our heat loss. Staggered by the ventilation loss. I would estimate only 500 watts or 0.1 ACH. Base on t...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

I didn't word the above question very well. I am trying to see what the 0.5 ACH old standard would mean to a 2024 built building with a Air permeabil...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

Has anyone had a heat loss calculation to the 2025 standard? The firm I am using for my new HP is still using a building figure of 0.5ACH.

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
SAP Report
5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 0
Views: 322
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

A big thank you to @jamespa for all his efforts online and via private message, he really does go all out to help. Hitachi visited today to address t...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Post-Traumatic Heat Pump Stress Disorder

Mars Excellent article. Love the term Post-Traumatic Heat Pump Stress Disorder (PTHPSD). I also monitor my HP "Like a Patient on Life Support".

5 months ago
Forum
Government Schemes, Regulations, Training, Planning & Organisations
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

@jamespa My mistake this was not the flow temperature chart, but my refrigerant temperature, it shows better what the heat pump was doing. Below i...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

Yesterdays run 8th Dec. Chart is showing flow temperature. The HP didn't like a set temperature of 29C. Very little on periods. Lots of temperatur...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

I have been experimenting with different flow temperatures to help facilitate the setting up of WC. Todays run was the lowest temperature I have used...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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