Calorimetric measurement of indoor sunshields
Because of the sun irradiation the incorrect dimensioning of a house can lead to excessive internal temperatures. Cooling is a common solution, but this consumes a large amount of energy. Preventing the entry of solar radiation into the building is a better solution. The main question is, which thermal effect (gand Uvalue) curtains and blinds have on the internal room temperature and cooling energy, due to less sun irradiation.
Application of multi-output ARX models for estimation of the U and g values of building components in outdoor testing
Abstract This paper presents the application of multi-output ARX (Auto-Regression with eXtra inputs) models to estimation of the U values of building components tested outdoors. Multi-output models make it possible to take interaction of the physical quantities involved in the process analysed into account. This approach has been used to analyse two quite different building components. The tests were carried out in one of the PASSYS test cells at the CIEMAT’s “Plataforma Solar de Almeria (PSA)” in Tabernas (Almeria, Spain). Several data sets were studied for each of these components using multi-output and single-output models, as well as theoretical values, and the results were compared. Very good performance of the multi-output models was observed for the samples analysed.
Test cell analysis of the use of a supply air window as a passive solar component
Abstract A series of experiments was conducted to determine the performance characteristic of a ‘double’ window used to pre-heat background room ventilation. A theoretical model of heat exchange conditions within the window was compared with results from a test cell. The test cell was used in different modes, firstly free-ventilated with the service room window and interconnecting duct to the cell left open, and then with forced ventilation at a consistent velocity to analyse the relative extent of direct solar and ventilation heat gain. A subsidiary study sought to determine the frequency of positive and negative air flow through trickle vents under real house conditions, this was compared with glass temperatures from the test cell measurements to assess the risk of condensation forming within the window. By reference to recent work on ventilated PV systems it was possible to derive a method of relating the U value and Solar Heat Gain Coefficient within the window cavity to a range of boundary conditions.