The general purpose of heat recovery can be said to be threefold: to reduce energy use; to reduce peak power need; to increase the time constant of the building for heating and ventilation as well as domestic hot water production. In this documant the interest is concentrated on heat recovery in ventilation systems and theirinfluence on power and energy balance for buildings.
This paper discusses some inference problems in measurement programs. The 1991 Swedish energy and indoor climate survey is chosen for the purpose of illustration. The Swedish survey is carried out within the research program "Conservation of Electricity in Existing Buildings" (ELIB), consists of three projects: 1. Technical characteristics of the Swedish housing stock; 2. Indoor climate of the Swedish housing stock; 3. Energy conservation potentials in the Swedish housing stock.
The three common tracer injection strategies all proved reliable in a test chamber under complete mixing conditions. For field studies of air flow patterns in large rooms the step-up method or the pulse method is recommended to escape the initial complete mixing condition of the decay method.
Describes Germany's carbon dioxide reduction programme, which was passed in November 1990. As a step towards the protection of the global atmosphere, the extensive national programme is designed to cut back the carbon dioxide emissions in Germany by 25% by the year 2005. These values are based on the 1987 figures, so that 25% is the equivalent of 300 million tons of CO2. For the construction industry an even higher is to be achieved.
Kitchen hoods play an essential role in the ventilation of kitchens. This paper describes activities carried out at the Belgian Building Research Institute with respect tothe determination of kitchen hood efficiencies. The linkwith European standardization is also described.
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