Building performance and ventilation system.

With a dynamical model, the thermal behavior of a single office room is simulated. The model includes among other things the behavior of occupants, the heat production of machines and lights, the heat flux into masses, real weather data (hourly observations) and different HVAC and control systems. The computer program calculates monthly and yearly energy consumption and a statistical distribution of the room air temperature. It can also be used to investigate the time evolution of physical processes for short periods. A parametric study shows how the U-value of the facade and the building performance influence the energy consumption. Climatic conditions and types of HVAC-systems are also varied. For office buildings with an envelope of a good quality, the total energy consumption is predominantly determined by the electrical supply power of the machines (computers, copying machines, etc). Other factors may be important, as for example the type and the control strategy of the HVAC-system. The building performance and the ventilation system are strongly related to the comfort of the occupants.