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سطح پیشانی رادیاتور
The usual condition determining the radiator frontal area will be either climb'at sea level or climb at the maximum altitude, that is, the condition at which the heat-transfer rate per unit frontal area is lowest when the entire total pressure available for cooling is utilized.
If 1000 horsepower is to be transferred to the cooling air, the necessary radiator frontal area is 1000/.164 or 6 square feet.
Once the radiator frontal area is fixed, the operating.line of the radiator is the ordinate in figure 3 through a heat-transfer ,
The variation with altitude of required optimum radiator volume and of optimum open radiator frontal area, which equals two-thirds of total frontal area, is shown in figure 86.
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