No abstract

In mixing ventilation systems, diffusers are often located on side walls and supply quasi-free air jets above the occupied zone. The data presented in this paper shows a new CFD 3D benchmark with two well-defined characteristic zones in the room, i.e., the quasi-free jet zone and the occupied zone. Measurement methods adequate for air velocity and speed measurement were applied: laser Doppler anemometry for the axial velocity component in the jet and low velocity thermal anemometry for the air speed in the occupied zone. Measurements were performed in a physical scale model (1:5) of the room. The kinematic similarity criterion was fulfilled by the equality of the Reynolds numbers in the model and in the prototype. To identify boundary conditions, additional measurements were carried out in the inlet region (as close as possible to the supply opening). The CFD results validation and reporting methods applicable for the benchmark data are proposed in Hurnik et al. (2015) [1].

No abstract

No abstract

The paper presents a part of project entitled "Development of thermal diagnostics of buildings", which related to reduced of energy consumption in the buildings. The detailed scope of the project is described in [1]. As part of the research task, a method of a rapid diagnosis of heating system [2], cooling sources [3] and airconditioning systems was developed as well as a method of calculate building energy performance certificates based on measurements [4]. This paper presents the research done in two office buildings. The obtained results were referenced to the design documentation. The results of the inspections and measurements on the mechanical ventilation system were discussed. Attention was paid to the divergence between the documentation and the installation status of both buildings. The problems encountered during the measurements were discussed. 2. THERMAL DIAGNOSIS AND MEASUREMENT METHODS FOR THE INSTALLATION OF MECHANICAL VENTILATION In developed countries, almost 40% of the consumed energy is used in the buildings. There have been repeated attempts to reduce this energy consumption