Room Air Distribution Research Articles

吹き出し気流の設計に関する基礎的研究 (II) : 冷気流に関する不快指標とこれを最小にするための吹出条件 (スロット吹出の場合)

This paper presents a guide for optimum design of room air distribution in summer cooling with the slot air-supply system. When discharging the cool air from the slot, the air pattern remains horizontal on the ceiling until the separation occurs. After separation, the cool air drops down into the occupied zone that causes discomfort to occupants. In this paper, a scale for evaluating discomfort by cool air jets is derived. The experiments give us characteristics, which enable us to estimate first, the value of the maximum air velocity in the occupied space and second, the value of the discomfort scale on the point where the cool jet drops. Based on the analysis for minimizing discomfort, an optimum set of values for the outlet conditions is suggested.

Numerical Solution of Room Air Distribution : Part 4-Calculation of Temperature Distribution using Wall Function and Numerical Model for Region near Supply Opening

Numerical Solution of Room Air Distribution : Part 4-Calculation of Temperature Distribution using Wall Function and Numerical Model for Region near Supply Opening

室内空気分布の数値解法に関する研究・2 : 3 次元流れの可視化実験

This paper is concerned with there dimensional flow visualization to examine the adequacy of numerical solution of room air distribution. The shape of room model which is same as the mumerical study in the former report is a cube with outlet at the center of the ceiling and inlet at the bottom center of the side wall. Water is used instead of air for the conveniecnce of visualization, and powder of light cake made of wheat-gluten is used as tracer. Reynolds numbers based on the length and the velocity of outlet are 1000-8000. Some characteristic features of visualized flow are given below. 1) Injected jet falls straight down, 2) then spreads radially over the bottom surface. 3) Upward stream from four corners of the bottom to the ceiling is notable. 4) At the other part upward stream does not reach to the ceiling but recirculates inside. 5) Near the ceiling stream spreads radially from the corner of the ceiling, then falls down at the center. 6) Flow near the inlet is complicated and periodic movement is observed. 7) Flow across the symmetrical plane is seen momentary, but as an average symmetry is maintained.

室内空気分布の数値解法に関する研究・3 : 2 方程式モデルによる乱流の 3 次元解析

This paper is concerned with three dimensional solution of room air distribution by a two-equation model of turblence and the Marker-and-Cell method with second order accuracy. The analyzed flow in the first paper was laminar, and the visualized flow in the second paper was turbulent. Therefore, it is urgent necessity for practical purpose to make a numerical method of turbulent flow. The two-equation model in this paper is one in which eddy diffusivity v_t is determined from the transport equation for turbulence kinetic energy q and that for turbulence energy dissipation rate e. The analyzed room model was cubic shape with supply outlet and exhaust inlet, and was divided into 18×18×18 cells. Then, computations were carried out and steady solution could be obtained. The reulsts of computations are summed up as follows, 1) The flow patterns resemble to those of the analyzed laminar flow and the visualized turbulent flow. 2) The solutions of pressure and turbulence quantities, q, e, v_t, l do not seem to be inconsistent with authors' knowledge qualitatively. 3) The energy budget seems to balance roughly. 4) The order of pressure loss coefficient obtained from the numerical solution was almost appropriate. From the above results, this method was showed to be efficient to some extent as a predictive method of room air distribution.

3008 室内空気分布に関する研究 (その14) : 多孔板吹出口の計算式と実測の比較

3008 室内空気分布に関する研究 (その14) : 多孔板吹出口の計算式と実測の比較

3007 室内空気分布に関する研究 (その13) : 多孔板吹出口の計算

3007 室内空気分布に関する研究 (その13) : 多孔板吹出口の計算

3009 新聞社輪転機室の空気分布調査結果

3009 新聞社輪転機室の空気分布調査結果

3073 誘引型吹出口ユニットによる室内気流について(計画,昭和38年度(仙台)大会学術講演要旨集)

3073 誘引型吹出口ユニットによる室内気流について(計画,昭和38年度(仙台)大会学術講演要旨集)

313 通風による室内風速・風向分布について(計画)

313 通風による室内風速・風向分布について(計画)