The cost of higher insulation measures in all new house types may be paid for by savings from smaller, simpler and more efficient heating systems. These houses are more comfortable to live in, as well as up to 50% cheaper to heat.

Results from testing of a simple model in a wind tunnel are used to validate two computational fluid dynamics mathematical models. The results show that only the Reynolds-stress model provides a reasonably accurate representation of the inlemal flow, and that both models fail to predict the flow at the opening of the model

The paper describes a method to calculate the heat flow through a multiple layer wall in a natural climate. The thermal properties needed for the calculation are the thermal resistance and the heat capacity of each layer, and they are assumed to be independent of the temperature. The natural climate can be measured temperatures, either surface temperatures or temperatures of the surrounding air. The method is based on well-known equations for calculating the heat flow due to a sinusoidal temperature variation.

The most critical aspect of the operation of any air-distribution system is the way that conditioned air is delivered to the occupied space, says Paul Jones