The energy consumption in summer operation of air conditioning system using gas direct-fired machine as cooling and heat sources in an office building is analyzed,existing problems in the operation of air conditioning system is also analyzed,and the improvement measures for energy-saving are put forward.

the properties are compared that Diesel Engine-driven vapor compression refrigeration and direct-fired LiBr absorption refrigeration,both the ideal cycle analysis and actual product performance.

Two kinds of zinc-plating furnace are introduced: one is heat-accumulating gas-burning or oil-burning furnace using high-temperature air burning technique; another new direct-burning body-connected gas heating furnace with coal or coke as fuel.