Abstract
Large-span air-conditioning plant rooms have a large roof area and suffer from serious solar radiation in summer. The outside roof surface temperature is very high, so cooling load of roof occupies a large proportion in the envelope structure cooling load of large-span air-conditioning plant rooms. Based on the Coanda airfoil air induction unit, the author combined with exhaust air in large-span air-conditioning plant rooms to design the roof air film cooling system of large-span air-conditioning plant rooms. The adherence air film formed on the outside surface takes away heat on the outside surface of the roof, so as to reduce outside roof surface temperature of the roof, decrease heat transfer temperature difference between inside and outside roof surfaces of, and reduce roof cooling cold. Furthermore, the mathematical model and numerical simulation method of considering fluid-structure interaction for heat transfer and influences of solar radiation on air film formation of outside surface and cooling were constructed. Moreover, the numerical simulation method was conducted the validation of effectiveness. Also, the author discussed the air film formation mechanism and air film cooling ability of outside surface in large-span air-conditioning plant rooms without natural wind, developed a new air film cooling technology for the roof of large-span air-conditioning plant rooms, and supplemented the existing roof cooling technology.
Highlights
The outside roof surface temperature is very high, so cooling load of roof occupies a large proportion in the envelope structure cooling load of large-span air-conditioning plant rooms
The adherence air film formed on the outside surface takes away heat on the outside surface of the roof, so as to reduce outside roof surface temperature of the roof, decrease heat transfer temperature difference between inside and outside roof surfaces of, and reduce roof cooling cold
The outside surface of the surface has the high temperature and the roof area has the large proportion in the envelope structure of large-span air-conditioning plant rooms, so the cooling load of the roof has a large proportion in envelope structure cooling load of large-span air-conditioning plant rooms
Summary
Zhang Yang [10] adopted the pressure sensitive lacquer experiment technology to do an experimental study on the plane cascade end wall’s air film cooling characteristic of high-pressure turbine rotors. Based on the Coanda airfoil air induction unit, the author combined with exhaust air in large-span air-conditioning plant rooms to design the roof air film cooling system of large-span air-conditioning plant rooms, constructed mathematical model and numerical simulation method of fluid-structure interaction between air film of outside surface and garret, as well as influences of solar radiation on outside surface air film on the roof, conducted the validation of effectiveness for numerical simulation method and discussed influences of Coanda airfoil air induction unit’s supply velocity on the outside surface air film formulation mechanism, cooling effect and inside roof temperature distribution
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