subject: Rooftop Air Conditioning Unit, Ideal For Occasions And Set [print this page] Is a unit integral unit, the refrigeration, heating, ventilation, air purification, electrical control assembly in one, multi-installed on the roof, so that the roof air-conditioning machine. In recent years, RTU with its compact structure, wide energy range, convenient adjustment, reducing installation time and cost saving advantages, is increasingly used in air conditioning engineering.
1 Unit Features 1.1 unit compact, comes with heat source, air cooling. In recent years, multi-unit modular design, combination of convenience, eliminating the need for cooling water systems.
1.2 unit in the structure of the measures taking into account rain, installed in the roof or the outside platform, it can rain and shade facilities undefended.
1.3 unit comes with full computer control, high degree of automation and electrical connection unit is compact, the scene only to connect a small number of control lines and the main Power supply Cable.
1.4 unit efficient and reliable cooling system can meet all types of air-conditioning requirements, Condenser And the evaporator is generally aluminum fins with copper production, heat transfer efficiency.
1.5RTU not account for the effective area of the room. In some areas the use of power than water-cooled units.
2 rooftop air conditioners jurisdictions 2.1 water-cooled machine with the wet bulb temperature as the base, while the air-cooled machine dry bulb temperature as the base, so RTU usually in one day dry bulb temperature more favorable to use a larger area, like Shenzhen in China and Hong Kong.
2.2RTU cool as the wind, it can be used in dry areas, like Middle East countries and the United States LasVegas most cases, RTU. China's Hong Kong due to lack of resources, government regulations do not have air conditioning design the best Cooling tower So many buildings using the RTU.
2.3 water-cooled machine by building height restrictions, water pressure can not be too high, is usually a series of 100m height, while the cooling tower will affect the building aesthetic setting, so the current international high-rise buildings of more than 200m too much by air-cooled machine.
3 unit set 3.1 rooftop unit's settings, first select the most economical installation location is selected in the load is concentrated to reduce the pipeline cost.
3.2 To consider the noise Environment Effects. Unit should not exceed the allowed noise noise standards, there is information from the noise standards set within 5m, with data, less than 5m away from the aircraft noise from a greater impact on the environment, and in a greater impact than 5m, so it is best at a distance setting unit residential buildings over 5m. Current noise reduction measures will be set in the laying of acoustic surface or lining material, it can also be Compressor Set within the enclosures. In addition, the lower the speed exhaust fan, located in the inlet and outlet silencer device is an effective measure to reduce noise.
3.3 units to consider the impact of vibration on buildings to prevent sound transmission into solid working and living environment. Generally be located under the rubber mat unit, located in the damping out of the pipe joints, and try to units deployed in load-bearing walls, the roof plate in the middle to prevent the setting time students resonance.
3.4 unit set up to consider building on the exhaust fan and vent position, because the discharge of these places the air flow will affect the flow of the roof, so RTU should be kept away from air vents.
3.5 local wind conditions will affect the operation of the fan condensing unit. When the fans rotate freely when the wind will make the condenser air flow obstruction, while one-way rotation of the fan cover to prevent the above phenomenon. In addition, the wind would be difficult to maintain stable RTU lighter, so the local wind conditions should be considered.
3.6 for high-rise buildings to consider whether the limited power of cranes, so be sure before installing unit weight.
4 selection and installation of units Precautions
4.1 units of air tightness and leakage prevention panel is important, rain, snow, dust, cold air would change with the air infiltration, so that the capacity of units down, life expectancy decreased. In addition to considering the slope of the roof, so that unit remains level.
4.2 units of a large number of condensate water to be immediately removed, as it has water, it will breed microorganisms and algae growth, impact on air quality. Condensate should not be emitted into the roof, this will reduce the country gray surface layer of the life of the roof, usually through the sewage discharge.
4.3 trap is best to install the unit inside, to prevent freezing.
4.4 rooftop condenser coil fin unit, due to exposure to outdoor air, the set of gray is serious, reducing the efficiency of the condenser. At present, some foreign companies to design a unit that comes with small water Pump Periodic flushing system, but because of technical complexity of the system, domestic machine is still actively explore and transform the stage.
5 Conclusion With the development of urban construction, the construction requirements continue to increase, no cooling tower air-cooled rooftop units will be more and more, and as Energy Work forward, rooftop air conditioner will be more and more customers, especially dryland its users.
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