🌍 Did You Know? 🌍
A little-known fact among BER assessors is that if a house adjoins a commercial space with similar heating schedules, the partition walls can be considered internal. This insight can significantly impact your BER assessment!
🔍 Understanding the Rules: In a dwelling that's part of a larger building where the rest is used for non-domestic purposes, the elements between the dwelling and the rest of the building are treated differently based on the heating patterns:
Zero Heat Loss: If adjacent spaces are heated similarly to the dwelling (18°C or more for at least 7 of the 8 coincident heating hours per day over an 8-month heating season), the walls can be considered to have zero heat loss.
Heat Loss Elements: If the adjacent spaces are unheated or only infrequently heated, those elements are treated as heat loss elements to an unheated space.
External Elements: If the spaces are heated to a different pattern (e.g., commercial premises), the elements are considered external with the U-value halved.
⚠️ Conservative Assumptions: If the nature of the neighboring premises is unclear, always opt for a conservative assumption. For instance, if you're unsure whether the adjacent heated premises is commercial or residential, assume it’s commercial.
🌡 Standard Heating Schedule: The DEAP manual outlines a standardized heating schedule for a typical household:
Weekdays: 07.00 to 09.00 and 17.00 to 23.00
Weekends: 07.00 to 09.00 and 17.00 to 23.00
During these periods, the living area should be heated to 21°C, and the rest of the dwelling to 18°C. The mean internal temperature is then calculated based on these set points and the floor area.
Make sure you're factoring in these nuances for a more accurate BER assessment!
For further inquiries or assistance, feel free to contact us.
For those interested in a more detailed energy or sustainability assessment, we recommend reaching out to our sister company MTSDNC. They provide expert advice on improving the efficiency of existing systems and understanding the impact these improvements can have on your building’s energy rating and sustainability.
Disclaimer:
The information provided in these posts is for informational purposes only and should not be considered design advice, specifications, or a calculation template. We assume no responsibility or liability for the use of the information presented. For professional advice or design services, please contact us via our contact form.
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