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Oasis Iceberg
12
2024
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07
Differences in Water Costs Between Closed-Circuit and Open-Circuit Cooling Towers
Closed-circuit cooling towers and open-circuit cooling towers are two common methods for cooling and reducing the temperature of industrial recirculating water; however, there are significant differences between the two. Today, we will focus on the differences in water-cost expenditures between the two.
Closed-circuit cooling towers and open-circuit cooling towers are two common methods for cooling and reducing the temperature of industrial recirculating water; however, there are significant differences between the two. Today, we will focus on the differences in water-cost expenditures between the two.
1. Different water loss rates
The water loss rate of a closed-circuit cooling tower is one in ten thousand, or 0.01%, whereas that of an open-circuit cooling tower is 2%.
2. Taking a 100-ton cooling tower as an example
Take a 100-ton cooling tower as an example: compared with a closed-loop cooling tower, an open-loop cooling tower loses an additional 1.9 tons of water per hour. This not only results in wasteful consumption of water resources but also increases operational costs for the enterprise.
3. Do the math carefully
With a cooling water flow rate of 100 tonnes per hour, an open-circuit cooling tower loses 1.9 tonnes more water per hour than a closed-circuit system. Over a 10-hour operating day, this translates to an additional 19 tonnes of water loss for the open system compared with the closed system. This calculation is based on a cooling water flow of 100 tonnes; what if the flow rate were 500, 800, or 1,000 tonnes? In that case, the daily water waste would exceed 100 tonnes. (For simplicity, let’s assume an average daily excess loss of 100 tonnes.)
Currently, industrial water costs ¥4 per ton (though the actual cost is higher). Therefore, operating an open cooling tower results in daily water losses that are ¥400 greater than those incurred by a closed cooling tower. Over one month, this translates to an additional loss of ¥12,000; over one year, the additional loss amounts to ¥150,000.
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