System concept. Building

Подпись: Fig. 1: Location of rooms and zoning for the second storey of the investigated building. Zone 1 is represented by the northern office rooms, zone 2 indicates the seminar rooms, zone 3 summarizes the glazed building entrance faced to the south as well as the stairs, zone 4 stands for sanitary rooms and circulation areas and zone 7 are the office rooms facing to the south.

The investigated building was planned as a three story office building according to passive house standard with a net floor area of 2155 m2. The building was planned for a location in Germany and consists mainly of office and seminar rooms. In addition, one room was reserved for the server facilities. Fig. 1 illustrates the location and size of the different rooms for the second storey of the building. Additionally, the chosen thermal zoning used within the simulation model is indicated. Both room types and zoning are similar for the other two storeys and are merged to single zones extended over the three storeys. Only for the office rooms facing south single zones for every storey have been used.

1.1. Server

The server room considered in the concept represents a special zone within the building, which needs to be investigated independent from the other zones. The server room is located at the northern part of the building, having negligible solar gains. However, a relatively large internal load was assumed for the IT facilities. During working hours (Monday to Friday, 8 am-6 pm), a constant heat input of 15 kW was considered. Outside of working hours, the heat input was assumed to be 7.5 kW. In order to protect the computer devices, maximal temperatures of 23°C are required, which can only be guaranteed by an active cooling system.