PR2002

Radiative cooling systems by means of nocturnal longwave radiation have captured the attention of today’s specialists involved in the construction building process. While most of the systems incorporate a flat-plate radiator that utilizes water, the prese

A review of the solar water heating equations in the BRE Domestic Energy Model was carried out using data from a recent monitoring project. The savings predicted by the model did not match the test data well, so improved equations were devised. Predictions from the new method were then tested against the measured savings from monitored systems and found to match the test data much better.

The Energy Conservation in Building and Community Systems program of the International Energy Agency has set up a research working group (Annex 40) on Commissioning of Building HVAC Systems for Improved Energy Performance. The objective of this new Annex is to develop, validate and document tools for commissioning buildings and building services. The paper describes the annex work which includes 5 tasks: 1) the commissioning process 2) manual commissioning tools 3) building energy management system assisted commissioning tools 4) use of models for ommissioning 5) commissioning projects.

The present work is part of a research effort aimed at integrating a detailed model of airflow in large spaces with an algebraic multizone infiltration model to describe pollutant transport and coupled air flows within and between complex buildings and large spaces. In the past 15 years, zonal models were developed with the goal to obtain an approximate prediction of airflow characteristics in large indoor spaces. Also, reducing the number of grids in CFD models is a natural way of decreasing their demand of computational resources to solve air flows in room.

Through the analysis of the main international environmental performance rating systems (BREEAM, LEED and GBTool) this work aims to show international design tendencies concerning sustainable building equipment requirements and to provide to designers and researchers a broad view of sustainable building equipment solutions. Hence a particular attention was paid to the assessment approach provided by these systems for each requirement, focussing on the comparison of the building performance to a benchmark, on compliance with qualitative indications or use of best technologies.

TRNSYS’ thermal building model, type 56, requires air flows between zones as input values. However, in natural ventilation systems these depend on the wind pressures and the inside and outside temperatures. To account for this situation, a coupling with a

Through the analysis of the main international environmental performance rating systems (BREEAM, LEED and GBTool) this work aims to show international design tendencies concerning sustainable building equipment requirements and to provide to designers and researchers a broad view of sustainable building equipment solutions. Hence a particular attention was paid to the assessment approach provided by these systems for each requirement, focussing on comparison of the building performance to a benchmark, compliance with qualitative indications or use of best technologies.

Ventilation determines the indoor air quality and has a profound effect on the energy consumption and thermal (summer) comfort of buildings. Simulation of natural ventilation leads to the prediction and evaluation of these performances.Coupling ventilation network and thermal simulation models is necessary to simulate natural ventilation as the mass and energy balance are physically linked in a naturally ventilated building. Several ways of coupling exist, each having its own possibilities and difficulties.

This paper describes work currently being carried out to evaluate the environmental impact and energy savings potential from the application of passive ventilation cooling in urban buildings. The work is carried out as part of an ALTENER project focussing on solar and passive ventilation for urban buildings. The study involves the collection of information for current building stock in four European countries; UK, France, Spain and Greece.

The working group WG4 of ISO TC 205 aims to define Indoor Air Quality criteria. The draftstandard contains several methods for determining ventilation rates, based on these criteria.The ventilation rates obtained with some of these methods are compared for several premises:ASHRAE 62-1999, the method of perceived IAQ of CR 1752, and the prescriptive method ofAS 1668.2. To improve the comparison, ventilation rates are also calculated with the prEN13779 method.The studied buildings contains offices, classrooms and a play area.