In order to reflect Xu s exemplary conduct and nobility of character and his deep and heavy human spirit,the article is set to describe in a historical view.

Energy conservation measures such as using high efficiency and energy saving fans,reforming converting control by frequency converter and optimizing operation mode are proposed.

With a project example, presents the heating system design for large space factory buildings with energy efficient hot air furnace as heat source.

An image quality assessment method related with luminance details;