English

Numerous researches have shown the possibility to enhance indoor natural ventilation in buildings by using inclined solar chimneys, although most of them usually include determining an optimum tilt for the absorber, considering an inclination angle between maximum solar irradiation and best stack height.

The objective of this paper is to present space heating strategies leading to a load reduction during critical periods on the grid but also taking into account the occupant thermal comfort in order to make them acceptable. Using TRNSYS, three types of strategies were investigated: lowering the thermostat setpoint, storing heat in the building thermal mass during off-peak hours and lowering the setpoint during critical periods, and limiting the available power to baseboards.

This paper presents the findings of an investigation of electricity consumption in mechanically cooled Nigerian office buildings.  

Low temperature heating and high temperature cool-ing systems such as thermally activated building sys-tems (TABS) offer the chance to use low exergy sources, which can be very beneficial financially as well as ecologically when using renewable energy sources.The above has led to a considerable increase of water based radiant systems in modern buildings and a need for reliable simulation tools to predict the indoor envi-ronment and energy performance.This paper describes the comparison of the building simulation tools IDA ICE, IES VE, EnergyPlus and TRNSYS.

The Soccer World Cup in Qatar 2022 has started a discussion on thermal comfort in soccer stadia, particularly in hot and humid climates and their related energy consumption.  To evaluate the thermal comfort in such an environment a calculation algorithm for the so-called “perceived temperature” (PT), is incorporated into the TRNSYS 17 simulation package.

This study investigates the feasibility of utilizing natural ventilation through operable windows to provide ventilation and summer cooling for an existing university dormitory building in marine west coastal climate (warm summer and mild winter). A hybrid research approach is used to evaluate the performance of proposed natural ventilation schemes, featuring building energy modeling with fully integrated airflow network, onsite blower door tests, and building utility data analysis. Both ventilation and thermal comfort are studied during the investigation.

Swirl diffusers can create better air mixing to enhance indoor air quality and help achieve compliance with Green Star IEQ-2 through Air Change Effectiveness (ACE) measure but the lack of modelling guidelines gives rise to the use of various modelling approaches with different results. The ACE calculation depends strongly on the flow characteristics produced by the diffuser outlet that vary considerably between different modelling set ups.

Model based exchange has the potential to improve the process of information exchange between different disciplines (Eastman, 2006), such as architect and engineer. However, there has not been a lot of success in automating the process of acquiring building geometry for energy analysis. This paper is part of a PhD research that investigates ways to improve the efficiency of exchanging building geometry for energy analysis.

Various building energy use modeling methods have been applied to existing buildings in order to understand building energy performance and improve energy efficiency. There are widely used models based on physical principles and historical data. This study has used temperature-based regression, artificial neural network and EnergyPlus models to predict energy use of a laboratory building. The paper discusses the accuracy of different methods when predicting short-term and long-term whole building energy use.

This paper deals with the results of an investigation into the freecooling efficiency in a low energy building using a PCM/air heat exchanger coupled with the me-chanical ventilation. The numerical model of the PCM system is coupled with the type 56 of TRNSYS in or-der to analyse thermal comfort conditions inside the building but also cooling energy savings due to such a system. Several air rate change, temperature of fu-sion, climate and convective heat transfer coefficient modes were analysed.