UK versus European housing ventilation (heat recovery).

In order to understand why Mechanical Ventilation with Heat Recovery is common in some countries of Europe yet installed in a small minority of domestic dwellings in the UK, surveys of Regional Electricity Companies and distributors have been carried out to identify whether there are grants available to promote the system in the UK and what influences sales of the system across Europe. A review of other heat recovery systems is provided to assess whether they are competitiors. As a major application of Mechanical Ventilation with Heat Recovery is for condensation problems, a review is also provided of the mathematical theory of ventilation of enclosures particularly orientating it to understanding the application of Mechanical Ventilation with Heat Recovery. Notes on the application of the system have been identified.