Ventilation heating system of small houses.

The buildings built according to the latest construction technology aiming at energy saving are as tight as possible. The ventilation of a tight building has to be completely mechanical (supply and exhaust a i r system). The heating of the building can also be included in the mechanical ventilation system with small additions. The new warm air heating system developed at the Laboratory of Heating and Ventilating of the Technical Research Centre of Finland is therefore called ventilation heating system. The ventilation heating system has several properties that can be achieved only when the heating effects needed by both heating and ventilation are completely adjustable on a room by room basis. Then the factors influencing room climate can be controlled with only one system. The ventilation heating system has sufficient sound insulation and sound attenuation due to the structure of the central unit and right selection of air terminal devices. The exhaust air flows are controlled by the inhabitant according to his local and temporal needs. The pressure ratios of the building, and the outdoor and exhaust air flows, are under control in the different fan operation conditions. The temperature of each room can be controlled with one adjusting knob according to the needs of the inhabitant. The heating system is suitable for upper-distribution (blowing of warm air from the wall or ceiling) . The room-based air flows do not have to be controlled accurately according to the heating need. The supply air ducts need not be heat insulated. The ventilation heating system particularly gives better changes to meet the inhabitants' expectations on the heating and ventilation systems, and gives bases for industrial production of a new generation of warm air heating and ventilation systems.