Abstract
New two-story wood-construction classrooms where added to an existing heavy-weight construction school building in the year 2006. The glass façade of some classrooms is south oriented. The building design meets the local thermal protection requirement of 2006, but the indoor temperature rises above thermal comfort conditions in the classrooms. As usual in Germany, no active cooling device is and shall be used. Measurements during holidays with close to none internal loads in addition to measurements during regular school occupancy documented the overheating. The measurement results were used to verify a baseline hygrothermal building simulation model that represents the status quo. Various passive measures with regards to construction, design and operation to improve the thermal comfort were assessed. Among them are ventilation strategies and solar protection foil on the glass façade. Furthermore, the already installed temporary sunscreen devices and mechanical night ventilation system coupled to mechanically openable skylights above the classroom doors and within the gravel covered flat roof were investigated with different operating strategies. This paper presents the required steps to improve the simulation model with the measured data in an iterative process. Measures to improve building performance, achieve thermal comfort, and protect overheating are identified.
Highlights
A light-weight construction building extension to a German school, which was added in 2008, shows an acute summertime overheating problem of classrooms
This paper presents a room climate evaluation by means of dynamic building simulation, validated with measured data, in order to determine the main influencing parameters and, based on this, to develop measures to reduce the overheating problem
The simulations are used to investigate two climatic situations: First, the simulation model is examined with measured outdoor climate conditions for the period with indoor climate measurement data
Summary
A light-weight construction building extension to a German school, which was added in 2008, shows an acute summertime overheating problem of classrooms. This paper presents a room climate evaluation by means of dynamic building simulation, validated with measured data, in order to determine the main influencing parameters and, based on this, to develop measures to reduce the overheating problem. The hygrothermal building simulation enables a dynamic indoor climate evaluation of the building and its individual zones, taking into account the overall system consisting of its structural and technical components. This enables different planning variants to be compared with each other and their effects on the thermal and hygric room climate to be evaluated in order to optimise the planning and operation of the building. Measures to reduce summer overheating and its influence on the remaining parts of the building can be taken into account and evaluations of the energy demand include the entire extension
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