May I ask, for air flow cooling, how is the temperature difference determined?
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In a hydraulic system for a mobile machine that needs to dissipate 66.8 KW of heat, water cooling is used to cool the hydraulic oil. The cooling water then cools down in a manner similar to that of an automobile engine’s cooling system, with the cooling water passing through the vehicle’s radiator and being cooled by the air flow generated by the moving vehicle. However, it’s not clear how to determine the temperature difference of this air as it passes through the radiator. If anyone knows, could they please give some guidance? :lol
You should choose: 1) Average air velocity: 1.2 m/S; 2) Average air temperature: 20℃
This post was last edited by wiseboy on 2018-2-11 08:31. You should choose: 1) Average air flow velocity: 1.2 m/S; 2) Maximum air temperature: 40℃； 3) The maximum temperature of water is 80°C. In other words, the temperature difference is: 80 – 40 = 40°C; this is necessary to ensure proper heat dissipation of the engine under extreme high temperatures (assumed to be 40°C). If you need complete and accurate heat transfer calculations, feel free to contact me.
Typical air cooler. You need to know the ambient air temperature, density, and wind speed facing the work area. The selected tube bundle structure, etc. Only then can heat transfer be calculated.