(1) Long service life;<br>(2) According to the change of outdoor meteorological parameters and indoor load changes to achieve the year-round multi-working conditions energy-saving operation adjustment;<br>(3) make full use of the new outdoor wind, reduce and avoid cold and hot offset, reduce the running time of the freezer;<br>(4) can strictly control the indoor temperature and indoor relative humidity;<br>(5) can effectively take silence and shock-proof measures, easy to manage and repair.<br>The main disadvantages of an all-air system are:<br>1 air than heat, density is small, the amount of air needs, the wind channel section break area is large, the transmission energy consumption is large;<br>(2) air-conditioning equipment needs to be centrally arranged in the machine room, the room area is larger, the layer is high;<br>(3) In addition to refrigeration and boiler equipment, air treatment units and ducts are expensive;<br>(4) The return of the duct system is complex and difficult to arrange;<br>(5) When the wind pipe and the air vent are more, it is not easy to adjust the air volume, the airduct requires insulation, affecting the cost;<br>(6) The full air system a system should not supply air conditioning in multiple rooms. Because the return wind system may cause air cross-contamination between rooms, in addition to the adjustment is more difficult;<br>(7) The installation of equipment and ducts has a large workload and a long cycle
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