IBPSA2013

Thermal coupling between a heat pump and a hybrid photovoltaic thermal (PV-T) collector is efficient for two reasons. First the heat produced by the PV-T collector raises the temperature of the cold source of the heat pump, increasing its coefficient of performance. Secondly the PV collector can be cooled in a more efficient manner than in usual cases, which increases its efficiency.  
The aim of the paper is to describe the work that has been done to evaluate by simulation the performance of such a system installed in a demonstration building. 

Hygrothermal properties (such as thermal conductivity, sorption isotherm, moisture diffusivity…) are required for all Heat, Air and Moisture transfer (HAM) models. The objective of this work is to study the effect of different parameters of HAM model and simulation conditions on the prediction of temperature and relative humidity in a room made of hemp concrete which is known to have a low environmental impact. After presenting its physical properties, we present equations of the HAM model with variable coefficients for a simple layer wall and for a building.

In order to find an effective method to keep indoor air quality good through the year in real houses, a simulation program: Fresh was reformed to integrate several important factors in Japanese detached houses and named “Fresh2010”. The factors are infiltration from the concealed spaces, behaviour of window openings, the kind of ventilation systems and a concentration control systems. The present dwellers’ habits of opening windows may be one of the factors in causing indoor air pollution.

This paper investigates the effectiveness of multiple external shading devices and identifies the most effective fixed external shading configurations for commercial building types in hot climates. Daylight contribution is also analysed in detail in order to monitor the daylighting factor reduction including uniformity for each shading configuration. Existing dynamic thermal modeling software is used to completing analysis on a theoretical open office plan building.

This paper reports on the simulation of the indoor thermal environment and energy demand of an Airport terminal space in the UK. It compares the performance of a mixed conditioning system (MC) and a displacement conditioning system (DC) in the airport terminal, under two different control strategies, through a coupled TRNSYS-FLUENT quasi-dynamic simulation. TRNSYS simulates the AC unit and control systems, while FLUENT simulates the airflow inside the terminal space.

This paper describes the measurement of wind velocity and pressure difference between that inside and outside of a single sliding door at open–close operation, and describes CFD analysis using measured pressure difference, aiming at the development of a CFD analysis approach considering opening and closing of a sliding door. Comparison with measurements verified that the analysis can reproduce unsteady phenomena observed in measurement in general.