Toshio Terai

A Theoretical Consideration On Heat Transfer In Fire Resistance Furnaces For Furnace Harmonization

To discuss the possibility of furnace harmonization, heat transfer in fire resistance furnaces were analyzed numerically. The analytical model included radiative and convective heat transfer between surfaces and gas volume. The heat exchange between thermocouple and its surroundings was taken into account in order to simulate the furnace control process. The model was verified by comparison with experimental data. By using the model, calculations were carried out for various furnace depth, fuel, wall lining materials and the geometry of thermocouples for furnace control. From the calculated results, it was concluded that the wall lining material is the main factor that controls the heat impact on specimen. The geometry of thermocouple is a secondary factor.

Numerical Simulation Of A Fire Resistance Test Of A Concrete Slab

~Vhen concrete is intensely heated during fire, creeping of temperatures in the region of 100°C are often observed. To simulate this phenomenon, a simple mathematical model for heat and moisture transfer in concrete is presented. The model takes into account the conservation of heat, water vapor and liquid Hater. As to the Hater contained in concrete, reversible evaporation of adsorbed Hater in the pores and irreversible thermal decomposition of chemically adsorbed water in cement paste are considered. These equations are so-called stiff equations and rather difficult to solve. For numerical stability, they are formulated by using integral equations coupled Hith the diagonally implicit Runge-Kutta method. NumerLoa.L solution of the model is compared Hi th the experimental data.

Transient analysis of air-conditioning load and room conditions considering simultaneous heat and moisture transport of multi-layered constructions

Abstract Moisture transport in a building has a major role in condensation problems. It also has much importance in the formation of room air humidity and air-conditioning load. The focal point of this paper is to evaluate room air humidity and air-conditioning load considering moisture transport by desorption and absorption of multi-layered constructions. For this purpose, a computer code has been developed. A brief description of the calculation method and the mathematical background is given. Validation of the procedure is carried out by comparing measured and simulated humidity and temperatures. Simulated examples are shown with the results that the sorption effect keeps air humidity of a storehouse stable and increases air-conditioning loads of an ordinary office room by about 5%.