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    <lastBuildDate>Thu, 03 Sep 2026 15:53:47 GMT</lastBuildDate>
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      <title><![CDATA[Manual J vs. Simplified Heat Loss Calculations: Accuracy, Speed & Standards Compared]]></title>
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      <description><![CDATA[Compare ACCA Manual J residential load calculations against European BS EN 12831 and simplified steady-state building physics models. Accuracy and speed evaluated.]]></description>
      <pubDate>Sun, 30 Aug 2026 00:00:00 GMT</pubDate>
      <author>Dr. Marcus Vance, CEng MCIBSE</author>
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      <title><![CDATA[Air Infiltration and Ventilation Heat Loss: The Complete Building Airtightness Guide]]></title>
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      <description><![CDATA[Master the building physics of convective heat loss, Blower Door n50 testing, natural infiltration (ACH), the stack effect, and MVHR heat recovery systems.]]></description>
      <pubDate>Fri, 28 Aug 2026 00:00:00 GMT</pubDate>
      <author>Dr. Marcus Vance, CEng MCIBSE</author>
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      <title><![CDATA[Whole-House Heat Loss Calculation: The Complete Building Energy Guide]]></title>
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      <description><![CDATA[Learn how to calculate total building heat loss in kW and estimate annual energy consumption using Heating Degree Days (HDD). Sizing rules for heat pumps and boilers.]]></description>
      <pubDate>Tue, 25 Aug 2026 00:00:00 GMT</pubDate>
      <author>Dr. Marcus Vance, CEng MCIBSE</author>
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      <title><![CDATA[Understanding U-Values and R-Values: The Complete Thermal Transmission Guide (BS EN ISO 6946)]]></title>
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      <description><![CDATA[Master the building physics of U-values, R-values, RSI, and thermal conductivity (lambda). Learn how to calculate composite multi-layer wall, roof, and floor assemblies.]]></description>
      <pubDate>Sat, 22 Aug 2026 00:00:00 GMT</pubDate>
      <author>Dr. Marcus Vance, CEng MCIBSE</author>
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      <title><![CDATA[Heat Pump Radiator Sizing & Delta T Explained: The BS EN 442 Low-Temperature Guide]]></title>
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      <description><![CDATA[Learn how to size radiators for low-temperature heat pumps using official BS EN 442 Delta T correction formulas. Understand Type 11, 21, 22, and 33 panels.]]></description>
      <pubDate>Thu, 20 Aug 2026 00:00:00 GMT</pubDate>
      <author>Dr. Marcus Vance, CEng MCIBSE</author>
      <category>Heat Pumps & Low Carbon</category>
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      <title><![CDATA[How to Calculate Room Heat Loss: A Step-by-Step Engineering Guide (BS EN 12831)]]></title>
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      <description><![CDATA[Master the complete engineering methodology for calculating single-room heat loss. Learn fabric transmission, ventilation draughts, thermal bridging, and radiator sizing.]]></description>
      <pubDate>Sat, 15 Aug 2026 00:00:00 GMT</pubDate>
      <author>Dr. Marcus Vance, CEng MCIBSE</author>
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