Method and device for cooling circulating air
Circulating air is cooled by heat exchange with adiabatically cooled process air. To this end, a first heat exchanging device is fed with circulating air and the process air. The heat exchanging device contains a humidifying device used to spray water into the process air. In this way, the process air is adiabatically cooled and the corresponding cooling is carried out by heat exchange with the circulating air. Before entering the first heat exchanging device and before leaving same, the process air is guided through a second heat exchanging device in which the cooled process air first extracts heat from the uncooled process air. This increases the cooling performance of the device.
1. A method of indirectly and adiabatically cooling circulating air by means of heat exchange within a first heat exchanger device with adiabatically cooled process air, wherein, before entry into the first heat exchanger device and after discharge from it, the process air is conducted through a second heat exchanger device, in which, after its heat exchange with the circulating air, the cooled process air absorbs heat from the uncooled process air.
2. A method as claimed in claim 1 , characterised in that the circulating air and the process air are conducted in cross-current in the heat exchange process.
3. A method as claimed in claim 1 , characterised in that the circulating air and the process air are conducted in cross-co-current through two cross-flow heat exchangers in the heat exchange process.
4. A method as claimed in claim 1 , characterised in that the cooling performance is controlled by variation of the circulating air/process air mass flow ratio.
5. A method as claimed in claim 1 , characterised in that the cooling performance is controlled by variation of the amount of water introduced into the process air.
6. A method as claimed in claim 1 , characterised in that the cooled process air is exhausted after it has absorbed heat from the uncooled process air.