As overheating problems in glassy buildings came up more and more, EMPA put a focus on the determination and modelling of the total solar energy transmittance (TSET) of multiple glazing combined with different shading systems within the framework of IEA Task 27 "Performance, durability and sustainability of solar faade components". Experimental data were produced by a calorimetric outdoor test facility near Zurich (Switzerland).
The construction and development of the PASSYS outdoor test cells were funded by the European Commission with the objective of providing high quality test environments for quantifying the performance of passive solar building components. Over the years since the original test cells were commissioned, the original concept for outdoor testing has been extended to include other test cell types. Significant improvements have been made to the experimental procedures and analysis techniques, and a broad range of components have been tested.
The IQ-Test Thematic Network has carried out round robin tests at 10 of the PASLINK outdoor test cell facilities. A round robin test generally produces a clear picture of the overall quality of certain test procedures carried out by the participating organisations. For practical considerations, each organisation constructed its own components according to strict instructions regarding the selection of materials, manufacture and instrumentation.
Outdoor testing of building and building components under real weather conditions provide useful information about the dynamical performance. Such knowledge is needed for properly characterizing the heat dynamics and provides useful information that can be used eg. to implement energy saving strategies. In order to analyse such tests models and methods for dynamic analysis are required. However a wide variety of models and methods exists, and the problem of choosing the most appropriate approach for every particular case is a non-trivial and interdisciplinary problem.
This paper presents the application of IDENT Graphical User Interface of MATLAB to estimate the thermal properties of building components from outdoors dynamic testing, imposing appropriate physical constraints and assuming linear and time invariant parametric models. Theory is briefly described to provide the background for a first understanding of the used models. The relationship between commonly used RC-network models and the parametric models proposed is deduced. The analysis is generalised for different possibilities in the assignment of inputs and outputs and even multioutput.
The PASLINK test facilities and analysis procedures aim to obtain the thermal and solar characteristics of building components under real dynamic outdoor conditions. Both the analysis and the test methodology have evolved since the start of the PASSYS Project in 1985. A programme of upgrading the original PASSYS test cells has improved measurement accuracy. The emphasis has moved from steady state to dynamic methods with shorter test durations yielding improved information and more accurate results.
From the experience gained in several EU research projects, an improved design for a common Test Reference Environment was made allowing the assessment of experimental data for electrical and thermal performance evaluation of photovoltaic systems integrated as cladding components into the building envelope, giving input to modelling work. The specific design of the PV module and test reference environment makes it possible to study through electrical and thermal energy flow analysis, the effect of using different materials for PV modules and construction design of claddings.
System identification allows the development of a dynamic model of a process. Such techniques have been applied also to the processes describing the thermal performance of buildings. Such a technique is the estimation of stochastic state space models. The aim of this paper is to investigate whether this technique could model the thermal performance solar pond scale models. The identification results allowed the modeling of the ponds thermal performance both with a physical model, based on the state space equations and with an ARMAX model.
A number of differences between the experimental results and the calculated thermal behaviour results of the timber frame walls have been obtained during the investigation carried out at summer operation conditions. The aim of the recent investigation is to determine at what stage in the calculation procedure the most significant errors in the estimation of the values of physical parameters might be made. The impact of errors on the further calculation reliability will be discussed as well.
The purpose of this work was to determine U and g coefficients of the external wall with transparent insulation under real external climatic conditions. As the mainly methodology used for obtainment of the intended results was adoption of the methodology based on Paslink test cells system. To obtain from the collected data the searched coefficients various method of analysis was used.
Login