The design of the small-sized apparatus of cooling circulating water

摘要

The article reviews the information on cooling the circulating water in tower coolers.It is shown that is the use of local re-cooling systems is the most relevant (small-sized devices) as they do not demand any expensive operation of extended pipeline networks,minimize emissions in the atmosphere.The designs of small-sized coolers and contact devices are also presented in this article.Currently,the used counterflow coolers have some drawbacks.The article proposes a cooling tower with a mixed current.A part of the air goes along the screw,and a part goes up helping to increase heat and mass transfer.Experiments were conducted and a comparative graph of the ratio of relative change in temperature of return water of the air flow rate was made to design the minicooler with a screw air flow in comparison with counterflow coolers.For the studied small-sized coolers in the range of ascending air flow rates up to 0.7 m/s,the relative temperature drop of the water is kept approximately in the same ratio.In the range of air flow velocities from 0.8 to 2.4 m/s,the increase in the value of the relative temperature drop of the water is more intense in the minicooler with a screw airflow.For example,at an air velocity of 1.4 m/s,the temperature difference for a minicooler with a screw air flow is 0.27.At the same time,in the specified value of the air flow velocity,the relative temperature of the water in the countercurrent minicooler is 0.24.