When is a U value real?

Posted by Conor Logan on 24/01/17 12:30

As a designer or specifier you will set U value requirements for elements of your building in order to meet Building Regulations, ensure comfort and avoid condensation.

Suppliers will offer products to “comply” with your specifications and quote a U value. But is it the real U value?

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Topics: Regulations, U Value, Air Leakage

Are you sure your natural ventilator really is energy efficient?

Posted by Paul Compton on 24/02/15 11:30

Compared to mechanical ventilators, natural ventilators consume no energy in use and their carbon footprint is negligible. But how much energy is lost through a natural ventilator through conduction and air leakage? If you are specifying an energy efficient ventilator, what do you focus on – ventilator U value or air leakage?

The simple answer is that both are important and need to be considered together.

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Topics: Natural ventilation, U Value, Air Leakage

Are you sure your natural ventilation system is energy efficient?

Posted by Paul Compton on 04/07/13 12:03

You are specifying an energy efficient ventilator: what do you focus on – ventilator U value or air leakage? The simple answer is that both are important and need to be considered together.

Maximum U values and air leakage

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Topics: Natural ventilation, Energy saving, U Value, Air Leakage