Analysis Of Cooling Conditions During Cooling Water Heat Dissipation Process
Q is the total heat from water heat dissipation, QC is evaporated heat dissipation, and QE is the amount of heat dissipation.
(1) When the air temperature is lower than the water temperature, the heat dissipation and evaporation heat dissipation of flowing and evaporation are the heat transfer of the same direction.
(2) When the air temperature is the same as the water temperature, the driving temperature difference between the flow heat dissipation is zero, so it will not produce the heat dissipation, but at this time, the evaporation heat dissipation still exists, so the heat dissipation of water at this time is equivalent to evaporating the evaporation at this time. Heat output,
(3) When the air temperature is higher than the water temperature, at this time, the temperature difference between the heat dissipation, that is, the high temperature to the low temperature heat dissipation, that is, the air recalls the water heat dissipation, and the temperature of the water will rise. However, if the evaporation of the water is largely compared with the amount of radiating volume at this time, the water temperature will continue to decrease. The final heat dissipation is q = qc-qe; Then water will not pass heat to the air. At this time, it is in a dynamic heat transfer balance, and the heat dissipation and evaporation heat dissipation are the same.
There is also a difference between evaporation and heat dissipation in different seasons. In spring, summer, and early autumn, the temperature of water and air is very small. Large, the main heat dissipation method is flowing heat dissipation, and in the northern region in the northern region, it can reach 70%of the heat dissipation in winter.
Under different water temperature conditions, the impact of flow heat dissipation and evaporation heat dissipation mainly depends on the temperature of Q and water at meteorological conditions. We use constant B = 99.3kPa, T = 36.6 ° C, and the air humidity is 27%. The heat exchange coefficient is α = 0.1419kW/㎡.
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