IBPSA2003

Validation is the key when attempting to instill confidence in a building simulation tool. The user expects that the underlying algorithms are correct, and will have more confidence in the simulation results generated using a program that has undergone validation testing. The IEA BESTEST (Judkoff and Neymark 1995) was developed by the International Energy Agency Solar Heating and Cooling (IEA/SHC) Task 12 and the Energy Conservation in Buildings and Community Systems Annex 21 as a test procedure for building simulation program developers.

Many studies have been performed on floor heating systems. However, there is almost no data on the response characteristics immediately after the start of the operation. In Japan, floor heating systems are often intermittently operated, so these response characteristics are important. In this research, the heat transmission response, the heat absorption response, and other response characteristics are simulated just after the start of the operation using a twodimensional heat conduction calculation. This calculation was performed using the finite element method.

When applying the radiant floor cooling system, it is important to prevent condensation on the floor surface. To solve this problem, a radiant floor cooling system integrated with the dehumidification system has been proposed and evaluated. In doing so, the relationship between the control variables in preventing floor surface condensation is first analyzed, and the control methods are evaluated through simulations.

This study develops a simplified estimation method for calculating the effective opening area of automatically operated entrance doors and the winter airflow rate into entrance halls due to the stack effect. The relationships between the number of people passing through the doors and the average opening area ratio were obtained from detailed simulations of a variety of different types of doors, and were approximated by equations.

This study discusses charging and discharging performance in building thermal mass storage systems. Building thermal mass storage systems utilize the thermal masses of the beams and the concrete floor slab to absorb cool energy that is produced using less expensive night electric power. The ratios of charged energy, discharged energy, and retrieved energy to the injected energy were obtained through numerical simulations. These ratios were used to evaluate the effects of various system and building design factors on the cooling system.

The primary aim of the present study was to evaluate thermal storage performance of the storage medium embedded with metal fins and to prepare and accumulate design data. Thus, basic study was performed on concrete structure embedded with metal fins by means of model experiment and numerical analysis.

We present a representational framework for the integrated operation of multiple environmental systems in buildings. A methodology for the automatic generation of this framework is introduced. The implementation of both rule-based and simulation-based control

During the last years much interest has been paid to Low Temperature Systems, i.e.

The current work presents features of an air-underfloor heating system and CFD model to predict velocity and temperature distribution. The paper describes the constructions of air-underfloor heat exchangers. Computational fluid dynamics professional software-ANSYS/FLOTRAN was used to simulate of turbulent airflow and radiation heat transfer in ventilated room with air-underfloor heating installation. The numerical simulation of many cases was performed to study the comfort criteria in the tested room.

Air supply diffusers used in air-conditioning systems can be classified as ceiling diffusers, sidewall diffusers, floor diffusers, jet nozzles, and low velocity displacement diffusers. Fixed or adjustable slats are usually used to control airflow directions. Recently, swirling vanes are used in floor diffusers to create swirling outflow jet, so that more rapid mixing with ambient air can be achieved. In this paper we used the latest CFD technique to investigate the airflow pattern and the impact on thermal comfort in the near nozzle region of a floorlevel swirl-type diffuser.