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Normative vs. realistic ventilation behaviour – effect of different ventilation strategies on the energy demand User behaviour can cause a large discrepancy between the calculated energy demand and the actual energy consumption of buildings. In a project funded by the Zukunft Bau research initiative, the room set point temperature was found to be the greatest influencing factor. Based on these results, the influence of different ventilation strategies on the energy demand was investigated. For this purpose, different ventilation pro‐files reflecting different times of presence in the building were simulated in a thermal building simulation program with hourly variable outdoor climate conditions and compared with standard‐compliant calculations. It has been shown that, compared to the permanent ventilation assumed by the standard, intermittent ventilation results in a considerable saving of useful heat energy, however, the number of ventilation processes plays a minor role. The comparison with measurements of the energy consumption in the building shows that the usage profiles with realistic ventilation behaviour show a significantly smaller discrepancy than the norm‐compliant usage profile. [ABSTRACT FROM AUTHOR]

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Air conditioning through prefabricated sandwich ceilings containing phase change materials. In this article the development and testing of a novel air-conditioning system using phase-change materials (PCM) is reported. The main principle is to store excess heat of the building interior into macro-encapsulated PCM which is integrated in the sandwich ceiling. The PCM increases the heat storage capacity of the building component in the relevant temperature range by a factor of greater than 10 and almost completely reduces a rise in building component temperature in the temperature range of the phase change of the PCM. In this way an overheating of the room can be counteracted. The presented results of extensive laboratory experiments document the basic functionality of the system regarding workability, cycle stability of the PCM and lowering of air temperature. It could be shown that operating in cyclic day-night mode a reduction of the air temperature by 2 Kelvin could be achieved. [ABSTRACT FROM AUTHOR]