| 摘要 |
<p>Heat exchanger for exchange between a liquid and a gas has a number of vertical plates. The exchanger operates in two modes (a) cooling the plates with the gas, (b) cooling liquid flowing over them by warming them back up again. This is organised on a cycle and provision is made during this that the plates are shielded from gas flow for a short period after the irrigation stops. This is done by rotating liquid distributors over radially extending vertical plates. Below the plates are rotating collector trays mounted approx in line with the distributors. However these serve to mask the plates being irrigated from the gas flow and are extended over more plates than those actually being irrigated on the trailing side (i.e. opposite side to rotation direction). This masks these plates to allow drainage before gas flow resumes. Increasingly cooling towers are becoming unacceptable because of water contamination by the atmosphere and excessive water loss. Air coolers are combersome to design suitable for extremes of summer and winter conditions. The cooler described combines the advantages of indirect air cooling and direct cooling without the above mentioned problems associated with them.</p> |
