Study of Temperature Field in Natural Ventilated Atrium

Full-scale experimental measurements and modified k-ε two-equation computational fluid dynamics(CFD) model with buoyancy term are used to investigate temperature field of the single-sided natural ventilated atrium with large openings. Compared with the measured values, the modified k--ε turbulent mode can effectively simulate the low Reynold number airflow in the single-side naturally ventilated atrium. Based on the experiment,the optimum period of utilizing natural ventilation for indoor climate control was determined. And the characteristic of the temperature field was analyzed and classified into two zones:lower linear temperature distribution zone and upper thermal accumulation area where temperature is power function distributed. These can be referenced for design and operation of atrium in north China.     

汽车空调余热溴化锂吸收式制冷装置传热分析

根据现有汽车空调制冷系统、采暖系统及汽车发动机冷却水系统的特点，结合单效溴化锂吸收式冷热水机组的性能，提出溴化锂吸收式制冷系统中的发生器由汽车发动机气缸套、气缸体、气缸盖组成，将溴化锂溶液直接充注在汽车发动机冷却空腔内，从而实现了用一个单效溴化锂吸收式冷热水机组系统替代现有汽车空调的制冷系统、采暖系统及汽车发动机冷却水系统的方案，结构简单。