China 
Africa 
Explore chapters and articles related to this topic
Forced Airflow
Published in James Jones, Demetri Telionis, Aeroform, 2023
An important design consideration for the grille or diffuser selection is the throw. Diffusers are typically specified by two characteristics, discharge velocity and throw distance. The throw is the distance from a center of the outlet face to a point where the velocity of the air stream is reduced to a specified velocity, usually 150 [0.75], 100 [0.50] or 50 fpm [0.25 m/s]. [3] The specified velocity is referred to as the terminal velocity. Generally, the throw will be larger for higher discharge velocities, and the velocity will be less the further from the diffuser. Understanding the throw is important for such design decisions as how far apart to place the grilles or diffusers to maintain good air distribution, where generally the throw should be approximately half of the spacing distance between devices.
Reinforced composite materials
Published in Andrew Livesey, Alan Robinson, The Repair of Vehicle Bodies, 2018
The three techniques used in the production of body panels are as follows: Cold press mouldings – This is used in the manufacture of the boot lid. The boot lid is formed by cold pressing a mineral reinforced resin-coated glass fibre mat in a gel-coated mould, forming a component which is very stiff in relation to its weight.Reinforced reaction injection moulding – The RRIM technique is used for all the vertical body panels such as the front and rear wings, front grille and bumper assembly and rear panel and bumper assembly. RRIM polyurethane has the properties of good recovery from deformation, outstanding resistance to wear, impact and abrasion and a fast cycle time in manufacture. The use of this material for all exposed corners of the car helps to reduce minor body damage repair.Pressure-assisted resin injection moulding – The bonnet is a pressure assisted moulding of sandwich construction with polyester resin exterior on either side of a rigid urethane core. The underside of the moulding is an intumescent fire barrier which is a major safety factor for an engine compartment cover.
Air Distribution
Published in W. P. Jones, Air Conditioning Applications and Design, 2012
Some general principles of grille selection are: A side-wall grille near a ceiling gives a longer throw than a square or circular ceiling diffuser.The effective use of grilles is limited to air change rates of less than about 12 per hour, with conventional ceiling heights.Stagnant air pockets may form if the air change rate is less than approximately four per hour, corresponding to specific supply rates of 3 l s−1 m−2.The drop may be excessive, in the non-isothermal case, if the discharge velocity through the free area is below 0.2 m s−1.The upper edge of the grille should be within 300 mm of the ceiling.Miller et al. (1971) consider that, for vertical vanes to be effective, the ratio of the depth of the vanes (in the direction of airflow) to their spacing, should lie between one and two.
Heat dissipation characteristic in the intake grille and radiator of a fuel cell vehicle
Published in International Journal of Green Energy, 2020
Chengyuan Gong, Jun Shen, Yi Yu, Kaiqiang Wang, Zhengkai Tu
In the numerical simulation, the computational area has a width of 3 m and a height of 1.2 m to encompass the front of the vehicle. Air is introduced 0.8 m away from the intake grille, and the radiator is placed approximately 0.1 m behind the intake grille, as shown in Figure 2c,d. The inlet grille is made of aluminum, which exhibits high toughness, anti-oxidation, corrosion resistance, and anti-aging to meet the requirements of appearance and function.