AIVC - Air Infiltration and Ventilation Centre

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thermal performance

Indoor climate of large glazed spaces.

In recent years large glazed spaces has found increased use both in connection with renovation of buildings and as part of new buildings. One of the objectives is to add an architectural element, which combines indoor- and outdoor climate. In order to obtain a satisfying indoor climate it is crucial at the design stage to be able to predict the performance regarding thermal comfort and energy consumption. This paper focus on the practical implementation of Computational Fluid Dynamics (CFD) and the relation to other simulation tools regarding indoor climate.

Towards an integral approach of building and HVAC system.

The dynamic thermal interaction between a building and the HV AC systems which service it is still difficult to predict. As this thermal interaction becomes more critical in practice, related knowledge and evaluation tools become increasingly important. It is argued why these need to be based on an integral approach of the overall problem. A research project aimed at development and/or enhancement of building performance evaluation tools for this field of interest is outlined.

Energy efficient window treatments.

Most building owners spend billions of dollars to outfit windows with drapes, shades, or blinds. Only a small fraction of this expenditure is ever targeted towards energy-efficient systems. Increased numbers of pleated, cellular shades with R-values presented In the R-3+ range are now in the marketplace. Foam plugs have been successfully used in many regions for low-cost, high R capability. The following elements shall be compared with respect to economic, utilitarian, thermal, and moisture issues:

Thermal analysis of rooms with diurnal periodic heat gain, ThermSim. Part 1: Derivation. Part 2: Practical use and comparison.

Temperature and cooling demand in a room summertime are influenced by numerous factors,like internal gains, ventilation, solar gain, behaviour of occupants, thermal inertia of the roomand outdoor conditions (climate).The thermal environment and cooling demand summertime are often analysed using detailedcomputer programs, which take into account the factors mentioned above (among others).Often the overview, transparency and some of the physical insight is lost using these advancedcomputer programs.In a predesign phase of a project it is preferable to do simple calculations of the thermalbeha

Experimental study on floor-supply displacement ventilation system.

Thermal performance of the floor-supply displacement ventilation system was evaluated in a large climatic chamber designed to simulate a single span of an office building. Detailed measurements were conducted to determine the indoor environment and skin temperature of a thermal manikin Temperature gradient in the room could be kept smaller, compared to conventional wall-supply unit displacement ventilation system, owing to the floor cooling effect of the floor-supply system.

Parametric prediction of the buried pipes cooling potential for passive cooling applications.

A new parametrical model for the prediction of the thermal performance of the earth to air heat exchangers is presen1ed. The system consists of an earth tube, buried in the ground, through which ambient or indoor air is propelled and cooled by the bulk temperature of the natural ground. The proposed model has been developed by analysing temperature data of the circulated air at the pipe's outlet using a systematic parametrical process.