In plastic molding or die casting where the mold temperature is high, there is little merit to use cold cooling water from a chiller.
Indeed, the temperature gap between the mold and the cooling water is practically the same whether it is cooled in chiller or in cooling tower (【Fig-01】).
The small difference can be covered by increasing the flow rate. In the following example, the increase in flow rate required for the cooling tower water to have the same cooling performance as the chiller water is only 4 %.
The electric consumption of a chiller is about 40 times larger than that of a cooling tower. In spite that there is little difference in the performance of mold cooling in die casting, there is a big difference in cost performance between chiller water and cooling tower water.
The temperature gap between the mold and the two kinds of cooling water is small.
Temperature of molten aluminum at the beginning of cooling process: ℃ / Temperature of molten aluminum at the end of cooling process: 350 ℃ / Weight of aluminum per one shot: 22 kg / Cycle time: 120 sec.
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