... refrigerated system Advanced gas/liquid technology Energy Conservation ISO9001:2008 & CE HRD Series Air Dryer Work Condition and Technical ... & system reliable running & life as well. III.Energy conservationNew design of the heat exchanger, adverse current structure, ... practical conditions,we designed & manufactured HOLYSUN brand HSD series Refrigerated Air Dryer,Absorbing Air Dryer,After Cooler,Air ...