A cross-flow polymer membrane enthalpy exchanger has been designed which provides both heat recovery and moisture dissipation in the ventilation of living spaces. The exchanger is of benefit in providing fresh air during both cooling and heating seasons with minimum loss of energy. A prototype of the enthalpy exchanger has been constructed and tested. The air leakage of the equipment has been found to be negligible; that is, the two air streams are indeed non-mixing.
As part of the AIVC's technical programme, study has been performed on present and advanced ventilation systems. The first part of the study presents a review on demands for basic ventilation of residences and major design considerations forventilation systems. The second part is a review on ventilation systems advanced approaches divided into: air movement control systems; flow quantity control systems; ventilation heat recovery systems; alternative ventilation energy systems.Furthermore a system for the classification of ventilation systems is suggested.
Tracergases provide a way to determine airflows in different situations. In some cases it is the only way to get quantitative information. This paper presents two cases in which tracergases are used for measuring the internal leakage in heat recovery units. Internal leakage in heat recovery ventilators (HRV's) for domestic use may cause some problems: - the real quantity of fresh air entering the building is unknown - electrical power for the fans is used inefficiently - smelling air a.g.
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