In a room with a raised floor HV AC system (RF system), the vertical temperature gradient became an important factor in relation to the ventilation requ1rement to maintain a vertical temperature difference within a comfort standard such as ASHRAE Standard 55-1992. A series of detailed laboratory experiments were carried out to obtain the design ventilation requirements with various conditions of ventilation rates, cooling loads, and types of floor outlets. The main results are shown as follows.
Thermal performance of the floor-supply displacement ventilation system was evaluated in a large climatic chamber designed to simulate a single span of an office building. Detailed measurements were conducted to determine the indoor environment and skin temperature of a thermal manikin Temperature gradient in the room could be kept smaller, compared to conventional wall-supply unit displacement ventilation system, owing to the floor cooling effect of the floor-supply system.
This report is one of a series giving practical advice on methods of reducing radon levels in existing dwellings. It is intended for the guidance of householders and builders who seek to reduce radon levels in dwellings by sealing cracks and other discontinuities in solid ground floors. The remedial measures described are mainly for concrete floors laid directly on the ground but some of the principles could be used with suspended concrete floors and, to a lesser extent, with floors consisting of large stone slabs.
This report is one of a series giving practical advice on how to reduce indoor radon levels in existing dwellings. Its specific subject is radon remedial measures for houses with suspended timber floors. These measures can also be used with other types of suspended floor, although they are not relevant to timber finishes laid directly onto concrete bases. The report is aimed at builders who carry out radon remedial work and householders who are competent at D IY.
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